CN105572162A - Thermal contact resistance testing equipment with compensation heating system and thermal insulation system - Google Patents
Thermal contact resistance testing equipment with compensation heating system and thermal insulation system Download PDFInfo
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- CN105572162A CN105572162A CN201510954538.0A CN201510954538A CN105572162A CN 105572162 A CN105572162 A CN 105572162A CN 201510954538 A CN201510954538 A CN 201510954538A CN 105572162 A CN105572162 A CN 105572162A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses thermal contact resistance testing equipment with a compensation heating system and a thermal insulation system. The thermal contact resistance testing equipment mainly comprises a bearing-loading system, a heating system, a cooling system, the compensation heating system and the thermal insulation system, wherein the bearing-loading system is used for applying stress to a sample; the heating system is used for transmitting heat to the sample in a one-dimensional manner; the cooling system is used for cooling the cold end of the sample; the compensation heating system is used for keeping the temperature of contact interface between samples at theoretic conduction temperature; a thermal insulation layer covers the heating system and the sample, and the thermal insulation system uses graded thermal insulating layers formed by refractory ceramic fiber cotton and perlite. The thermal contact resistance testing equipment has the advantages that the transverse loss of heat on the sample is effectively reduced by the compensation heating system and the thermal insulation system, operability is increased, and pollution is reduced.
Description
Technical field
The invention belongs to technical field of measurement and test, be specifically related to a kind of thermal contact resistance test equipment and method, be applicable to the test carrying out thermal contact resistance in different temperatures and pressure limit, effectively can ensure the hot-fluid one dimension transmission of contact interface.
Background technology
When hot-fluid is when contacting solid surface and transmitting, impact due to solid real surface micro-bulge causes effective contact area much smaller than nominal contact area, thus hot-fluid contraction is defined at microscopic contact points place, cause contact interface to produce extra heat transmission resistance, be thermal contact resistance.In thermal contact resistance test process, need to ensure hot-fluid one dimension transmission from bottom to top on sample, avoid the lateral heat flow in sample sagittal plane to lose, especially the lateral heat flow loss of contact interface.According to heat transfer dynamics, in plane, the temperature difference is larger, and the power of heat transfer is larger, in order to reduce the lateral heat flow loss around sample as far as possible, therefore need arrange compensation heating and heat-insulation and heat-preservation system.The compensation heating of existing thermal contact resistance test equipment and heat-insulation and heat-preservation system all adopt three-dimensional ring heater and single perlite heat-barrier material; Three-dimensional ring heater thickness is comparatively large, can affect greatly the sample hot-fluid outside non-contact interface; Perlite heat-barrier material resistance to elevated temperatures is poor, and the meeting powdered when carrying out thermal contact resistance test under high temperature, environmental pollution is serious.
Summary of the invention
The present invention in order to solve the reliability of heating system in the test of existing thermal contact resistance, safety and stability is low, the problem of poor operability, propose a kind of to there is the thermal contact resistance test equipment compensating heating and heat-insulation and heat-preservation system.
The present invention has the thermal contact resistance test equipment compensating heating and heat-insulation and heat-preservation system, comprises carrying-loading system, heating system, cooling system, insulating and compensating heating device.
Described loading-bearing system comprises bearing part and loading section; Cooling system, sample and heating system is disposed with from top to bottom between bearing part and loading section.Wherein, heating system is arranged on bearing part, for having the table of furnace chamber; Be provided with sample well heater in furnace chamber, be used for making furnace chamber inside form hot environment by sample well heater.Be provided with heat conducting device in sample well heater, heat in furnace chamber be passed to the sample of table upper surface installation by the form transmission of one dimension.Cooling system is arranged at the circumferential position of sample, for the cold junction of sample cools; The cold junction of sample applies stress by the power conductive bar of loading section, and stress intensity is gathered by pressure transducer.Described sample is axially designed with test point, and the temperature at test point place has thermopair collection.
Above-mentioned table and sample are covered with insulating, and insulating is arranged on bearing part; Be used for ensureing the hot-fluid one dimension transmission on sample.Outside sample, compensating heating device is installed, ensures that the hot-fluid one dimension of the contact interface between sample transmits by compensating heating device.
Described sample is axially designed with test point, and the temperature at test point place has thermopair collection.
Applying the above-mentioned method of testing with the thermal contact resistance test equipment compensating heating and heat-insulation and heat-preservation system is adopt single heat flow meter method or double heat flux meter method to be realized by following step:
Step 1: the installation of sample.
Sample is fixedly mounted on table upper surface; Apply stress by loading section in loading-bearing system to sample simultaneously; And thermopair is installed at the test point place on sample, and by the buttock line connection data acquisition system of thermopair.
Step 2: to sample heating and loading stress, collecting test point temperature.
By opening sample well heater, sample being heated, treating that specimen temperature reaches stable, by the temperature of each test point of data acquisition system.
Step 3: the medial temperature calculating two sample contacts interfaces adjacent in sample.
Step 4: using medial temperature as theoretical transition temperature, by the ring heater in temperature control system control and compensation heating arrangement, temperature compensation is carried out to adjacent two sample contacts interfaces, ensures that the contact interface place of two adjacent samples remains on theoretical transition temperature;
Step 5: determine that the temperature at adjacent two sample contacts faces place is fallen by extrapolation thermograde.
Step 6: the axial heat flux density determining sample.
Step 7: the axial heat flux density with sample falls in the temperature at two the test sample surface of contact places determined according to step 5 and step 6, calculates contact conductane and the thermal contact resistance of two test sample contact interfaces.
The invention has the advantages that:
In the compensating heating device of 1, thermal contact resistance test equipment of the present invention, ring heater is flat hollow circle, thickness is little, make belt well heater close to only carrying out temperature compensation to the contact interface between sample, realize the horizontal isothermal of contact interface and ring heater, the axis transmission of hot-fluid in sample contacts interface is maximized, avoids the loss of lateral heat flow.
In the compensating heating device of 2, thermal contact resistance test equipment of the present invention, the fixed support of ring heater adopts high temperature mullite material to process, the heat-proof quality of high temperature mullite material is good, hardness is little, easy making process, easy accessibility, operation steps when significantly simplifying the structure of three-dimensional circular well heater stationary installation and change sample.
3, the insulating of thermal contact resistance test equipment of the present invention is according to regional temperature characteristic, adopts refractory ceramic fibre cotton and perlitic classification to arrange, improves heat-proof quality, avoid perlitic powdered, eliminate dust pollution, improve operating environment.
4, thermal contact resistance test equipment of the present invention, can carry out the thermal contact resistance test under different temperatures and force combination easily.
Accompanying drawing explanation
Fig. 1 is thermal contact resistance test equipment one-piece construction schematic diagram of the present invention;
Fig. 2 is the top board structure schematic diagram of carrying-loading system in thermal contact resistance test equipment of the present invention;
Fig. 3 is heating system structural representation in thermal contact resistance test equipment of the present invention;
Fig. 4 is cooling system structure schematic diagram in thermal contact resistance test equipment of the present invention;
Fig. 5 is thermocouple stabilization supporting structure schematic diagram in thermal contact resistance test equipment of the present invention;
Fig. 6 is compensating heating device structural representation in thermal contact resistance test equipment of the present invention.
In figure:
1-carrying-loading system 2-heating system 3-cooling system
4-temperature control system 5-data acquisition system (DAS) 6-computing machine
7-sample 8-insulating 9-compensating heating device
10-thermopair 11-center rest 101-pole
102-top board 103-base plate 104-hold-down nut
105-pressure transducer 106-power conductive bar 107-reinforcement
201-table 202-well heater 203-heat conducting device
201a-non-master bearing position 201b-direct bearing position 201c-non-immediate bearing position
201d-position easy to wear 202a-heater strip 301-central through hole
302-cooling duct 303-dividing plate 304-cold water inlet pipe
305-cooling water outlet pipe 901-compensates heated holder 902-ring heater
903-compensates heat hot galvanic couple 11a-through hole 11b-screw hole
Embodiment
The present invention has the thermal contact resistance test equipment of stable heating system, comprises carrying-loading system 1, heating system 2, cooling system 3, temperature control system, insulating, compensating heating device, data acquisition system (DAS) 5 and computing machine 6, as shown in Figure 1.
Described loading-bearing system 1 comprises bearing part and loading section; Bearing part comprises pole 101, top board 102 and base plate 103, provides one-piece construction framework; Wherein, top board 102 and base plate about 103 are horizontally disposed with, four poles 101 of all being established by circumference are fixedly connected, connected mode is: every root pole 101 and between top board 102 and base plate 103 by being positioned at top board 102 and base plate 103 both sides, and the hold-down nut 104 that screw thread is arranged on pole 101 is tightened fixing; By unclamping hold-down nut 104, the adjustment of top board 102 and base plate 103 level angle and vertical height can be realized.Above-mentioned top board 102 forms bearing system jointly in conjunction with pressure transducer 105 and power conductive bar 106, and the test stress for sample regulates.Wherein, pressure transducer 105 one end is fixedly mounted on top board 102 lower surface center by screw; Pressure transducer 105 other end is fixed by the stiff end of screw and power conductive bar 106; The power conduction terminals of power conductive bar 106 contacts with the cold junction of sample.Thus, regulated pressure transducer 105 applied pressure by the upper-lower position adjusting top board 102, and transferred the pressure to the cold junction of sample by power conductive bar 106, complete the loading to sample.Meanwhile, the pressure signal of acquisition is gathered by data acquisition system (DAS) 5 by pressure transducer 105, and is sent in computing machine 6 and carries out showing and storing.Top board 102 described in the present invention adopts steel plate, be designed to cruciform Lightened structure, as shown in Figure 2, and at top board 102 end face by corresponding criss-crossing reinforcing ribs 107, ensure the intensity of top board 102, also reduce the weight of top board 102 self, to realize, compared with the test carrying out thermal contact resistance under low stress, making the installation of sample and thermopair etc. more convenient to operate simultaneously.
Said sample 7 hot junction is installed in heating system 2, and heating system 2 is fixedly mounted on base plate 103, comprising table 201, sample well heater 202 and heat conducting device 203, as shown in Figure 3, obtaining stable one dimension thermal source for making sample 7.
Wherein, table 201 entirety adopts high temperature mullite fragment of brick and high alumina fragment of brick to pile up and forms, there is the sidewall that bottom pedestal, the bottom pedestal upper surface outer circumference of piling up upwards are piled up, table top is by the top plate seal of overlap joint, and then at bottom pedestal, form furnace chamber between sidewall and top board, be used for sample well heater 202 and heat conducting device 203 are installed.Wherein, the external circumferential of bottom pedestal is non-master bearing position 201a; Bottom pedestal upper surface (namely pedestal at the middle and upper levels in fragment of brick except the fragment of brick connected with sidewall all the other fragments of brick) as direct bearing position 201b; Unless all the other positions in the pedestal of bottom outside primary load bearing position 201a and direct bearing position 201b are non-immediate bearing position 201c; Top board is position 201d easy to wear.Thus, non-master bearing position 201a and non-immediate bearing position 201c all adopts heat-proof quality excellent but not resistance to heavily stressed high temperature mullite brick; And directly bearing position 201b and position 201d easy to wear all adopts effect of heat insulation difference but resistance to heavily stressed high-alumina brick.By above-mentioned table 201 structure, for sample well heater 202 and heat conducting device 203 provide closed, insulation, heat insulation fixed space; Described closure has completely cut off oxygen, prevents the heater strip 202a in sample well heater 202 to be oxidized, and when each replacing sample also without the need to carrying out dismounting again to heating system 2, thus has ensured the stability of heating system 2; Scattering and disappearing of the heat that heat insulating ability can prevent sample well heater 202 from producing, ensure that the stability of the efficiency of heating surface and hot-fluid; Thermal insulation can prevent table 201 external temperature too high, thus has ensured the security of sample well heater 202 and heat conducting device 203.And due to high-alumina brick rough surface, easy to wear, mullite brick smooth surface, wear-resisting, therefore table 201 structure had both met heat insulation, the thermal requirements of heating system 2, in turn ensure that table 201 can bear heavily stressed, effectively avoid table 201 side and the wearing and tearing of end face in test operation process.Said sample well heater 202 is used for making furnace chamber inside become hot environment, for the heat conducting device 203 of sample well heater 202 inside heats.As shown in Figure 3, sample well heater 202 is cylindrical shape, vertically arranges, and end face and bottom surface contact with bottom pedestal upper surface with the top board of table 201 respectively.Heater strip 202a in sample well heater 202 coordinates with the spiral groove that sample well heater 202 outer wall designs and installs, and as shown in Figure 4, sample well heater 202 outer wall is wound around twist.Heater strip 202a is connected with safety switch with the thyristor regulating depressor of outside, and thyristor regulating depressor is used for regulating the voltage at heater strip 202a two ends, and then controls the thermal power of heater strip 202a, thus realizes adjustment that is temperature required to test and heat.Safety switch is used for automatically closing when thermal contact resistance test equipment meets accident and occurs short circuit or electric leakage, ensure that the safety of thermal contact resistance test equipment and operating personnel.
Heat conducting device 203 is solid cylinder, for heat is passed to sample 7.The graphite material that heat conducting device 203 adopts thermal conductivity good, is coaxially arranged in sample well heater 202 inner chamber, and end face and bottom surface contact with bottom pedestal upper surface with the top board of table 201 respectively.Thus, the heat that sample well heater 202 produces will pass to the sample hot junction of table 201 end face installation by heat conducting device 203 with the form of one dimension, thus the hot junction being embodied as sample 7 provides stable one dimension thermal source.Set-up mode between said sample 7 and table 201 end face is:
Table 201 end face fixedly mounts specimen mount.In specimen mount, centre is provided with groove, groove diameter is slightly larger than sample 7 diameter, make the hot junction of sample 7 as in groove, ensure that sample 7 stability thus, and the centering between the hot junction of sample 7 and heat conducting device 203, improve the efficiency of heating surface, make the hot junction of sample 7 have stable one dimension thermal source
In the present invention, sample well heater 202 adopts ceramic cylinder, because ceramic bucket is likely charged, therefore ceramic cylinder adopts without bottom surface structure, heat conducting device 203 bottom surface is directly contacted with the direct bearing position 201b of table 201 center base upper surface middle part, and do not contact with ceramic cylinder, prevent heat conducting device 203 charged and impact safety is direct.Simultaneously, the through hole communicated with sample well heater 202 inner chamber is evenly had in spiral groove 202a in the present invention also on sample well heater 202 outer wall, through hole is used for the heat produced to well heater 202 inner chamber transmission heater strip 202a, thus ensure that the heat that heater strip 202a produces can pass to heat conducting device 203 with maximal efficiency, improve the efficiency of heating surface of heating system 2.
Described cooling system 3 is used for as the cold junction of sample 7 cools.As shown in Figure 4, cooling system 3 adopts the annular cold water storage cistern with central through hole 301, central through hole 301 is designed with internal thread, on power conductive bar 106 outer wall, be designed with external thread simultaneously, and then cold water storage cistern thread bush is connected in power conductive bar 106, make cold water storage cistern be positioned at the cold junction of sample 7, and by the threaded engagement between cold water storage cistern and power conductive bar 106, make the upper-lower position of cold water storage cistern in power conductive bar 106 adjustable, and then change the cooling effect to sample 7 cold junction.Low temperature is passed to power conductive bar 106 by cooling water tank, is reduced, realize the cooling of sample 7 cold junction by the temperature of power conductive bar 106.Cold water storage cistern inside is provided with the cooling duct 302 of spirality around cold water storage cistern central through hole 301, the dividing plate 303 of edge's relative position opening is provided with in cooling duct 302, by dividing plate 303, cooling duct is divided into upper, middle and lower-ranking, in order to ensure that recirculated cooling water flows to top from bottom, prevent from being detained.Bottom cold water storage cistern, sidewall is designed with cold water inlet pipe 304, and top sidewall is designed with cooling water outlet pipe 305, and inlet tube 304 is communicated with by cooling duct 302 with outlet 305.Thus, chilled water enters cooling duct 302 from cold water inlet pipe 304, and adverse current is through cooling duct 302 from bottom to top, flows out from cooling water outlet pipe 305.This kind of type of cooling adds the contact area of chilled water and power conductive bar 106, improves cooling effectiveness to greatest extent.Ensure the cold junction temperature of sample 7.
Thermal contact resistance is tested the method adopted and is comprised single heat flow meter method and double heat flux meter method, and in single heat flow meter method, sample 7 comprises two test samples and a heat flow meter sample; In double heat flux meter method, sample 7 comprises two test samples and two heat flow meter samples.In two kinds of methods, test sample is identical with the geomery of heat flow meter sample, by coaxially arranging up and down, and end face laminating; And the Measure and test sample material of heat flow meter sample is different, selects the material that correlation parameter is known.In single heat flow meter method, be followed successively by test sample-test sample-heat flow meter sample from top to bottom; In double heat flux meter method, be followed successively by heat flow meter sample-test sample-test sample-heat flow meter sample from top to bottom.By loading-bearing system to sample loading stress, what realize between each sample is relatively fixing.In above-mentioned single heat flow meter method and double heat flux meter method, the thermal resistance of two test sample contact interfaces is the thermal contact resistance that need test.In order to reduce the contact interface oxidation of adjacent samples in test process in the present invention, at the even coated with high temperature glue in the contact interface place of adjacent samples with starvation.
In above-mentioned single heat flow meter method and double heat flux meter method, along axis arranged n test point on the sidewall of each sample, n>=3, the axial length of to be l/n, l the be each sample of the distance between n test point; And test point on each sample is respectively apart from the distance l of this sample upper surface and lower surface
1equal, two distance l simultaneously
1sum equals the spacing of adjacent two test points, that is: 2l
1=l/n.Above-mentioned each test point place offers the probe mounting holes of thermopair 10, is used for installing thermopair 10.
As shown in Figure 3, thermopair 10 as temperature sensor, for measuring overall sample 7 Temperature Distribution axially.Thermopair 10 adopts K type nickel network Nickel-Silicom thermocouple, the measuring junction of a thermopair 10 is all connected in the probe mounting holes can testing each test point on the temperature range of 0 ~ 1300 DEG C, each sample, the buttock line of thermopair 10 is connected with data acquisition system (DAS) 5, the temperature data gathered by data acquisition system (DAS) 5 is depicted as temperature variation curve by computing machine 6 to carry out showing and storing, so that operator carries out the monitor and forecast of temperature.
In test process, sample 7 meeting expanded by heating, the thermopair 10 of some measuring points may loosen or come off.The present invention devises a kind of center rest 11 for stationary heat galvanic couple 10.Center rest 11 is positioned at the side of overall sample, is fixed on the top board of table 201 by base, ensures the stability of center rest self, prevents coming off of thermopair 10.The height of center rest 11 is equal with the axial length of sample 7, and on center rest 11, the measurement point position corresponded on sample 7 has through hole 11a, also have screw hole 11b, and screw hole 11b communicates with through hole 11a, axes normal, as shown in Figure 5 simultaneously.Thus, by the buttock line corresponding end of each thermopair 10 through the through hole 11a on center rest 11, and tighten fixing by screw through screw hole 11b.
Said heating system 2 and sample 7 outside are covered with insulating 8, and insulating 8 is arranged on base plate 103, according to the difference of insulating 8 present position temperature, selects the material of different heat-proof quality.In the region of heating system 2 temperature outside lower (20-50 DEG C), then the perlite adopting resistance to elevated temperatures poor but cheap is as insulating 8; Adopt in the region of sample 7 environment temperature very high (20-1000 DEG C) high insulating effect but expensive refractory ceramic fibre cotton as insulating 8, to prevent the transverse direction of heat to scatter and disappear, make heat increase along the axis of sample 7.Insulating 8 in the present invention have employed refractory ceramic fibre cotton, considerably reduce the temperature outside heating system 2 in conjunction with the design of table in the present invention 201 simultaneously, thus avoid the independent perlite that adopts as the too high perlitic powdered caused of temperature during insulating 8, eliminate dust pollution, improve operating environment, be more suitable for engineering test and laboratory study.
In thermal contact resistance test process, even if having employed insulating 8, the contact interface position hot-fluid loss transversely of adjacent samples is also inevitable, and in order to reduce lateral heat flow loss as far as possible, therefore the present invention have also been devised compensating heating device 9.Compensating heating device comprises compensation heated holder 901, ring heater 902 and compensates heat hot galvanic couple 903, as shown in Figure 6.Wherein, compensate heated holder 901 and be arranged on the top board of table 201, be the annular frame structure be made up of axial uniform pillar, it is inner that sample 7 is positioned at fixed compensation heated holder 901.Compensating heated holder 901 adopts aluminous refractory to process, and the resistance to elevated temperatures of aluminous refractory is good, and hardness is little; And it is simple to compensate heated holder 901 one-piece construction, easy making process, can change at any time.The upper draw-in groove with compensation heated holder 901 designs of ring heater 902 circumference coordinates, and grafting is fixedly mounted on and compensates in heated holder 901, is positioned at and adjacent samples contact interface isometry position.The well heater 902 that goes in ring adopts flat loop configuration, and thickness is 2mm-5mm, and more thin more effect is better.Ring heater 902 is horizontally placed on the contact interface position in sample 7 between adjacent samples and heat flow meter, place plane and contact interface coplanar, and circumference is upper near sample, and inner ring test coupon 7 circumferential side wall of ring heater 902 distance is advisable for 20mm.Temperature compensation is carried out by the contact interface position of ring heater 902 pairs between adjacent samples and heat flow meter, temperature compensation has more specific aim, and be easier to install and fix, eliminate the three-dimensional circular well heater in the past adopted comparatively large by thickness (about 20mm), cause the impact of the thermograde formed between the noncontact face position and three-dimensional circular well heater of test sample.Above-mentioned each ring heater 902 is arranged one and compensate heat hot galvanic couple 903, compensate heat hot galvanic couple 903 to be connected with temperature controller, by the temperature feedback of ring heater 902 to temperature control system 4, the temperature horizontal isothermal that realize contact interface and ring heater 902 identical with the theoretical transition temperature of contact interface of ring heater 902 is set by temperature control system 4, the axis transmission of hot-fluid at contact interface place is maximized, avoids the loss of lateral heat flow.Thus by insulating 8 in conjunction with compensating heating device 9, the hot-fluid one dimension transmission of each contact interface can be ensured.
Temperature control system 4 and data acquisition system (DAS) 5 realize heating system 2 respectively, compensate heating system 2 temperature regulate and to the temperature of each point on sample and the automatic collection of applied pressure, arrange and store, and pass through numerical value and the change curve of the real-time displays temperature of computing machine 6 and pressure, operator is according to the temperature and pressure data of display in real time, the heating power of sample well heater 202 and ring heater 902 is adjusted by temperature control system 4, and control sample 7 applied pressure size by carrying-loading system 1, thus reach the temperature and pressure level of testing requirements.
The thermal contact resistance test equipment adopting the present invention to have stable heating system carries out thermal contact resistance test, and realized by following method, concrete steps are as follows:
Step 1: the installation of sample 7.
When adopting single heat flow meter method or double heat flux meter method, the hot junction of sample 7 is fixedly mounted in the groove of sample stand; Simultaneously by regulating the upper-lower position of top board 102 in loading-bearing system 1, conductive bar of exerting all one's strength 106 end contacts with the cold junction of sample 7, and applies stress to the cold junction of sample 7, and then sample 7 is fixed between top board 102 and table 201.Thermopair is installed at point for measuring temperature place on sample 7, and by the buttock line connection data acquisition system 5 of thermopair.
Step 2: heat and loading stress sample 7, gathers sample 7 test point temperature.
By opening the hot junction heating of the sample well heater 202 pairs of samples 7 in heating system 2, after 3 ~ 4 hours, treat that sample 7 temperature reaches stable, control data acquisition system 5 gathers the temperature at each test point place on sample 7, be sent in computing machine 6 and store, and draw the temperature variation curve at each test point place by computing machine 6.When the temperature variation of each test point in 15 minutes is within 0.2 degree, can think that the Axial Thermal flow transmission of sample 7 reaches stable state.
Step 3: the medial temperature calculating two sample contacts interfaces adjacent in sample 7;
Make the whole test points on two adjacent samples be respectively 1 from the bottom to top, 2,3 ..., m; M is the whole test point numbers on two adjacent samples, m=2n; N is the number of test points certificate on a sample.
The temperature of two then nearest apart from adjacent two sample contacts interfaces thermopairs 10 is respectively T
nand T
n+1, the temperature T at two adjacent sample contacts interfaces is determined by extrapolation thermograde
n', T
n+1' be respectively:
Wherein, T
1, T
2nbe respectively the temperature of bottom test point and the top test point in adjacent two samples.
Then T can be recognized
n' and T
n+1' mean value be the medial temperature Δ T ' at two adjacent sample contacts interfaces, for:
Step 4: temperature compensation is carried out to adjacent two sample contacts interfaces.
Using the medial temperature Δ T ' of adjacent two sample contacts interfaces as the theoretical transition temperature between two samples, temperature compensation is carried out to contact interface, by the ring heater 902 in temperature control system control and compensation heating arrangement 9, ensure that the surface of contact place of two samples keeps theoretical transition temperature Δ T '.
Step 5: by extrapolation thermograde (value that temperature reduces) the Δ T that determines that the temperature at adjacent two sample contacts faces place is fallen:
ΔT＝T
n′-T
n+1′
Step 6: the axial heat flux density determining sample 7 according to heat flow meter.
For the single heat flow meter method of employing, by calculating the axial heat flux density of heat flow meter sample, be the axial heat flux density q of sample 7;
For employing double heat flux meter method, be averaged by after the axial heat flux density that calculates two heat flow meter samples, be the axial heat flux density q of sample 7.
The axial heat flux density computing method of above-mentioned heat flow meter sample are:
The coefficient of heat conductivity variation with temperature of material is approximately linear relationship, according to the relation that thermal conductivity λ changes with temperature t, calculates parameter b and the λ with material and temperature correlation
0for:
λ＝λ
0(1+bt)
Then the axial heat flux density of heat flow meter sample is:
Step 7: the contact conductane and the thermal contact resistance that calculate two test sample contact interfaces.
Axial heat flux density with sample entirety falls in the temperature at two the test sample surface of contact places determined according to step 5 and step 6, and obtaining two test sample contact conductanes is:
Described thermal contact resistance is:
Claims (7)
1. have and compensate heating and the thermal contact resistance test equipment of heat-insulation and heat-preservation system, it is characterized in that: comprise carrying-loading system, heating system, cooling system, insulating and compensating heating device;
Described loading-bearing system comprises bearing part and loading section; Cooling system, sample and heating system is disposed with from top to bottom between bearing part and loading section; Wherein, heating system is arranged on bearing part, for having the table of furnace chamber; Be provided with sample well heater in furnace chamber, be used for making furnace chamber inside form hot environment by sample well heater; Be provided with heat conducting device in sample well heater, heat in furnace chamber be passed to the sample of table upper surface installation by the form of one dimension; Cooling system is arranged at the axial location of sample, for the cold junction of sample cools; The cold junction of sample applies stress by the power conductive bar of loading section, and stress intensity is gathered by pressure transducer; Described sample is axially designed with test point, and the temperature at test point place has thermopair collection;
Above-mentioned table and sample are covered with insulating, and insulating is arranged on bearing part; Be used for ensureing the hot-fluid one dimension transmission on sample; Outside sample, compensating heating device is installed, ensures that the hot-fluid one dimension of the contact interface between sample transmits by compensating heating device.
2. have as claimed in claim 1 and compensate heating and the thermal contact resistance test equipment of heat-insulation and heat-preservation system, it is characterized in that: the insulating at the region place of heating system temperature outside 20-50 DEG C adopts perlite material; Insulating at the region place of sample environment temperature 20-1000 DEG C adopts refractory ceramic fibre cotton.
3. have as claimed in claim 1 and compensate heating and the thermal contact resistance test equipment of heat-insulation and heat-preservation system, it is characterized in that: compensating heating device comprises compensation heated holder, ring heater and compensation heat hot galvanic couple; Wherein, compensate heated holder and be arranged on table upper surface; Ring heater is horizontally placed on the contact interface position in sample between adjacent samples and heat flow meter; Each ring heater is arranged one and compensate heat hot galvanic couple, compensate heat hot galvanic couple to be connected with temperature control system, by the temperature feedback of ring heater to temperature control system, by the temperature horizontal isothermal that realize contact interface and ring heater identical with the theoretical transition temperature of contact interface of temperature control system setting ring heater, the axis transmission of hot-fluid at contact interface place is maximized, avoids the loss of lateral heat flow.
4. have as claimed in claim 3 and compensate heating and the thermal contact resistance test equipment of heat-insulation and heat-preservation system, it is characterized in that: compensate heated holder and adopt aluminous refractory to process.
5. have as claimed in claim 3 and compensate heating and the thermal contact resistance test equipment of heat-insulation and heat-preservation system, it is characterized in that: described ring heater thickness is 2mm-5mm, preferred 2mm.
6. have as claimed in claim 3 and compensate heating and the thermal contact resistance test equipment of heat-insulation and heat-preservation system, it is characterized in that: ring heater inner ring test coupon axial side wall distance is 20mm.
7. application rights requires to have the method that the thermal contact resistance test equipment compensating heating and heat-insulation and heat-preservation system carries out thermal contact resistance test described in 1, it is characterized in that: adopt single heat flow meter method or double heat flux meter method, realized by following step:
Step 1: the installation of sample;
Sample is fixedly mounted on table upper surface; Apply stress by loading section in loading-bearing system to sample simultaneously; And thermopair is installed at the test point place on sample, and by the buttock line connection data acquisition system of thermopair;
Step 2: to sample heating and loading stress, collecting test point temperature;
By opening sample well heater, sample being heated, treating that specimen temperature reaches stable, by the temperature of each test point of data acquisition system;
Step 3: the medial temperature calculating two sample contacts interfaces adjacent in sample;
Step 4: using medial temperature as theoretical transition temperature, by the ring heater in temperature control system control and compensation heating arrangement, temperature compensation is carried out to adjacent two sample contacts interfaces, ensures that the contact interface place of two adjacent samples remains on theoretical transition temperature;
Step 5: determine that the temperature at adjacent two sample contacts faces place is fallen by extrapolation thermograde;
Step 6: the axial heat flux density determining sample;
Step 7: the axial heat flux density with sample falls in the temperature at two the test sample surface of contact places determined according to step 5 and step 6, calculates contact conductane and the thermal contact resistance of two test sample contact interfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510954538.0A CN105572162B (en) | 2015-12-17 | 2015-12-17 | Thermal contact resistance test equipment with compensation heating and heat-insulation and heat-preservation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510954538.0A CN105572162B (en) | 2015-12-17 | 2015-12-17 | Thermal contact resistance test equipment with compensation heating and heat-insulation and heat-preservation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105572162A true CN105572162A (en) | 2016-05-11 |
| CN105572162B CN105572162B (en) | 2019-01-11 |
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| CN106383139A (en) * | 2016-08-31 | 2017-02-08 | 中国特种设备检测研究院 | Boiler exterior wall heat radiation loss simulation test device |
| CN107421980A (en) * | 2017-02-04 | 2017-12-01 | 青岛大学 | Heating impedance compensation type thermo-resistance measurement method |
| CN108088869A (en) * | 2017-11-30 | 2018-05-29 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of thermal protection system Heat-Insulation Test device |
| CN108225903A (en) * | 2018-03-15 | 2018-06-29 | 国电锅炉压力容器检验中心 | A kind of station boiler small punch test device |
| CN108957195A (en) * | 2018-08-13 | 2018-12-07 | 深圳市博恩实业有限公司 | Heat resistance test apparatus for anisotropic thermal piece |
| CN109991266A (en) * | 2019-03-22 | 2019-07-09 | 上海工程技术大学 | The laser of interface heat exchange coefficient and material thermal conductivity heats measuring device and method |
| CN110018193A (en) * | 2019-03-22 | 2019-07-16 | 上海工程技术大学 | A kind of measuring device and measuring method of interface heat exchange coefficient and material thermal conductivity |
| CN110186948A (en) * | 2019-05-14 | 2019-08-30 | 重庆大学 | A kind of bearing ring and ball thermal contact resistance measuring system and measurement method |
| CN111077181A (en) * | 2019-12-06 | 2020-04-28 | 国网浙江省电力有限公司电力科学研究院 | Device and method for testing thermal contact resistance between outer surface of medium-low voltage cable and soil |
| CN113092525A (en) * | 2021-04-12 | 2021-07-09 | 哈尔滨理工大学 | Insulation material steady state heat conduction test system under electric field containing thermal drive guard electrode |
| CN117129523A (en) * | 2023-08-29 | 2023-11-28 | 北京市计量检测科学研究院 | Device and method for testing temperature of heat dissipation coating of integrated circuit |
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| CN106383139B (en) * | 2016-08-31 | 2020-06-02 | 中国特种设备检测研究院 | Simulation test device for heat dissipation loss of boiler outer wall |
| CN106383139A (en) * | 2016-08-31 | 2017-02-08 | 中国特种设备检测研究院 | Boiler exterior wall heat radiation loss simulation test device |
| CN107421980B (en) * | 2017-02-04 | 2019-08-23 | 青岛大学 | Heating impedance compensation type thermo-resistance measurement method |
| CN107421980A (en) * | 2017-02-04 | 2017-12-01 | 青岛大学 | Heating impedance compensation type thermo-resistance measurement method |
| CN108088869A (en) * | 2017-11-30 | 2018-05-29 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of thermal protection system Heat-Insulation Test device |
| CN108225903A (en) * | 2018-03-15 | 2018-06-29 | 国电锅炉压力容器检验中心 | A kind of station boiler small punch test device |
| CN108957195A (en) * | 2018-08-13 | 2018-12-07 | 深圳市博恩实业有限公司 | Heat resistance test apparatus for anisotropic thermal piece |
| CN110018193A (en) * | 2019-03-22 | 2019-07-16 | 上海工程技术大学 | A kind of measuring device and measuring method of interface heat exchange coefficient and material thermal conductivity |
| CN109991266A (en) * | 2019-03-22 | 2019-07-09 | 上海工程技术大学 | The laser of interface heat exchange coefficient and material thermal conductivity heats measuring device and method |
| CN110018193B (en) * | 2019-03-22 | 2022-02-18 | 上海工程技术大学 | Device and method for measuring interface heat exchange coefficient and material thermal conductivity |
| CN110186948A (en) * | 2019-05-14 | 2019-08-30 | 重庆大学 | A kind of bearing ring and ball thermal contact resistance measuring system and measurement method |
| CN111077181A (en) * | 2019-12-06 | 2020-04-28 | 国网浙江省电力有限公司电力科学研究院 | Device and method for testing thermal contact resistance between outer surface of medium-low voltage cable and soil |
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| CN113092525A (en) * | 2021-04-12 | 2021-07-09 | 哈尔滨理工大学 | Insulation material steady state heat conduction test system under electric field containing thermal drive guard electrode |
| CN117129523A (en) * | 2023-08-29 | 2023-11-28 | 北京市计量检测科学研究院 | Device and method for testing temperature of heat dissipation coating of integrated circuit |
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