CN111474204A - Method for testing heat conductivity coefficient of cylindrical sample by punching method - Google Patents
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Abstract
The invention discloses a method for testing the heat conductivity coefficient of a cylindrical sample by a punching method, which comprises the following steps: s11, selecting a sample to be tested and A, B two reference samples with different known heat conductivity coefficients, and processing the sample to be tested and the reference samples into cylinders with the same diameter and height; step S12, two temperature measuring holes are radially processed on the side wall of each cylinder; s13, respectively measuring and calculating the heat conductivity coefficient test values of the sample to be tested and the A, B reference sample by using a heat conductivity coefficient tester in a flat-plate steady-state method; step S14, estimating the real heat conductivity coefficient lambda of the sample to be measured by adopting a linear interpolation method*. The method for testing the heat conductivity coefficient of the cylindrical sample by the punching method realizes the test of the heat conductivity coefficient of the small non-standard cylindrical sample by using common steady-state heat conductivity testing equipment.
Description
Technical Field
The invention belongs to the technical field of thermophysical property testing, and particularly relates to a method for testing the heat conductivity coefficient of a cylindrical sample by a punching method.
Background
With the continuous application of power electronic products such as L ED lamps, IGBTs and the like, more and more attention is paid to the research on high-thermal-conductivity and low-expansion materials, such as metal matrix composite materials, and correspondingly, the characterization and measurement of the thermal conductivity of the materials or the products are more and more important.
The instable hot-wire method, the laser flash method and other transient test methods have high equipment cost, for example, domestic hot-wire method equipment generally has about 10 ten thousand, imported laser method equipment generally has more than 100 ten thousand, although the sample preparation and processing requirements are not high, the test cost is high, about ￥ 300 of each data point, and the test result of a sample with non-uniform material is very unstable, which is very unfavorable for the measurement of the thermal conductivity coefficient and the research and development of related products, while the conventional steady-state method has simple equipment, low cost and low test cost, but for materials with high self-value (such as silver, platinum and the like), the cost for processing respective standard samples is only too high for conducting heat conductivity test, and a large amount of experiments are actually needed, while the preparation and processing of metal-based composite materials and the like are difficult, and the cost for obtaining the standard samples is also very high.
Disclosure of Invention
The invention aims to provide a method for testing the heat conductivity coefficient of a cylindrical sample by a punching method, which realizes the test of the heat conductivity coefficient of a small non-standard cylindrical sample by using common steady-state heat conductivity testing equipment.
The invention adopts the following technical scheme: a method for testing the heat conductivity coefficient of a cylindrical sample by a punching method comprises the following steps: s11, selecting a sample to be tested and A, B two reference samples with different known heat conductivity coefficients, and processing the sample to be tested and the reference samples into cylinders with the same diameter and height; the height of each cylinder is not less than 8 mm; wherein the expected thermal conductivity range value of the sample to be tested is known; in the two reference samples, the thermal conductivity of one of the reference samples is greater than that of the sample to be measured, and the thermal conductivity of the other reference sample is less than that of the sample to be measured.
Step S12, two temperature measuring holes are radially processed on the side wall of each cylinder, the two temperature measuring holes are arranged at intervals up and down, and the hole distance is 6-80 mm; the depth of each hole is equal to or slightly less than the radius of the cylinder.
Step S13, respectively placing each cylindrical sample in a test auxiliary device, respectively inserting two thermocouples into the two corresponding temperature measuring holes by adopting a flat-plate steady-state method thermal conductivity tester, respectively measuring and calculating the thermal conductivity test values of the sample to be tested and the A, B reference sample, wherein the thermal conductivity test values are respectively as follows: lambda, lambdaAAnd λB。
Step S14, estimating the real thermal conductivity lambda of the sample to be tested by the thermal conductivity test value in the step S13 by adopting a linear interpolation method*；
λ*＝λB0+(λ-λB)·(λA0-λB0)/(λA-λB) (1)；
Wherein: lambda [ alpha ]A0The true thermal conductivity of the reference sample A; lambda [ alpha ]B0True thermal conductivity for the B reference sample.
Further, the method comprises the steps of:
step S21, processing a reference material with a known thermal conductivity coefficient into a plurality of cylinders with the same diameter and different heights; the height of each cylinder is not less than 8 mm;
step S22, two temperature measuring holes are radially processed on the side wall of each cylinder, the two temperature measuring holes are arranged at intervals up and down, and the hole distance is 6-80 mm; the depth of each hole is equal to or slightly less than the radius of the cylinder.
And step S23, respectively placing each cylinder sample in a test auxiliary device, respectively inserting two thermocouples into the two corresponding temperature measuring holes by adopting a flat-plate steady-state method heat conductivity coefficient tester, and respectively measuring and calculating the heat conductivity coefficient test values of the corresponding cylinders.
And step S24, drawing a data point diagram by taking the hole spacing of each cylinder as an abscissa and the heat conductivity coefficient test value as an ordinate, and fitting the data point diagram into a smooth curve to obtain a curve chart of the heat conductivity coefficient test value of the reference material.
And S25, selecting different reference materials, repeating the steps S21-S24 respectively to obtain a curve chart of the heat conductivity coefficient test value of each reference material under the diameter, and collecting the curve charts of the heat conductivity coefficient test values of the reference materials to obtain the standard maps of the heat conductivity coefficients of the different reference materials.
Step S26, repeating the step S21-step S25 in sequence, wherein in each repetition, different diameter values are selected in the step S21; and sequentially obtaining the standard maps of the heat conductivity coefficient test values of the reference materials under different diameters.
S27, taking a sample to be tested, wherein the expected thermal conductivity range value of the sample to be tested is known and is positioned between the maximum thermal conductivity test value and the minimum thermal conductivity test value in the standard map under the corresponding diameter;
selecting a corresponding diameter in the standard map as a standard diameter, processing the sample to be tested into a cylinder with the standard diameter, and repeating the steps S22-S23 to obtain a heat conductivity coefficient test value lambdac of the sample to be tested; in a standard map, the hole spacing of a material to be tested is taken as an abscissa, a heat conductivity test value is taken as a corresponding ordinate, perpendicular lines of all axes are made through the abscissa and the ordinate respectively, two straight lines are crossed to obtain a cross point, heat conductivity test values lambda 1 and lambda 2 of a reference material corresponding to two standard curves adjacent to the cross point above and below are read, heat conductivity values lambda 3 and lambda 4 of the reference material corresponding to the hole spacing of 80mm of the two curves are read simultaneously, and the real heat conductivity lambda 0, lambda 0-lambda 4+ (lambda c-lambda 2) · (lambda 3-lambda 4)/(lambda 1-lambda 2) (2) of the material to be tested is estimated according to a formula (3).
Further, the height of each cylinder is up to a little higher than 80 mm.
Furthermore, the hole distance between the two temperature measuring holes is 6 mm-80 mm.
Furthermore, the auxiliary testing device comprises a cylindrical heat-insulating sleeve with two open ends, two thermocouple jacks are radially arranged on the side wall of the heat-insulating sleeve, and the two thermocouple jacks are arranged at intervals up and down and correspond to the positions of the temperature measuring holes; the two ends of the heat insulation sleeve are respectively provided with a circular ring-shaped heat insulation plate, the outer side of each heat insulation plate is respectively provided with a copper plate which is tightly attached to the heat insulation plate, the copper plate at the upper part is used for heating, and the copper plate at the lower part is used for radiating.
The invention has the beneficial effects that: 1. the heat conductivity coefficient of the small-sized non-standard cylinder sample is tested by using the common stable heat conduction testing equipment, various expensive novel testing equipment and expensive testing cost are not needed, and the common teaching and scientific research requirements are met.
2. The method can be used for testing metal materials, metal matrix composite materials or other materials capable of being punched, and can be implemented as long as the thermal conductivity coefficient of a sample to be tested is between the highest curve and the lowest curve in a map, or two reference materials respectively lower than and higher than the sample to be tested are found.
3. The requirements for the diameter and the height of a sample to be tested are reduced, and the method can be implemented by selecting a proper reference sample material and selecting a certain diameter or a corresponding proper diameter in a map according to the requirements of a test or an actual test working condition.
4. Once the map is established, no further testing need be repeated, but the curves in the map can be finer, and samples of any well spacing can be read and evaluated by standard maps.
5. The errors of the thermal conductivity coefficient test value and the actual value are small when the hole spacing of the sample is 10mm or 80mm, generally less than 5%, and particularly, the error is not more than 1% when the hole spacing is small.
Drawings
FIG. 1 is a schematic view of the structure of a test specimen and accessories.
FIG. 2 is a graph of the relationship between the thermal conductivity of red copper, L Y12 and 45 steel and the sample hole spacing and a fitted curve.
Wherein: 1. a heat insulating jacket; 2. a thermocouple jack; 3. a heat insulation plate; 4. a copper plate. a. And (3) sampling.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. As shown in fig. 1, reference character a denotes the sample used.
The invention discloses a method for testing the heat conductivity coefficient of a cylindrical sample by a punching method, which comprises the following steps: s11, selecting two reference samples of a sample a to be detected and A, B with different known heat conductivity coefficients, and processing the two reference samples into cylinders with equal diameters and heights; the height of each cylinder is not less than 8 mm. Wherein the expected thermal conductivity range value of the sample to be tested is known; in the two reference samples, the thermal conductivity of one of the reference samples is greater than that of the sample to be measured, and the thermal conductivity of the other reference sample is less than that of the sample to be measured.
Step S12, two temperature measuring holes are radially processed on the side wall of each cylinder, the two temperature measuring holes are arranged at intervals up and down, and the hole distance is 6-80 mm; the depth of each hole is equal to or slightly less than the radius of the cylinder.
Step S13, respectively placing each cylindrical sample in a test auxiliary device, respectively adopting a flat-plate steady-state method thermal conductivity tester, respectively inserting two thermocouples into the corresponding two temperature measuring holes, respectively heating by the flat-plate steady-state method thermal conductivity tester, respectively measuring and calculating the thermal conductivity test values of the sample to be tested and the A, B reference sample, wherein the values are respectively as follows: lambda, lambdaAAnd λB。
Step S14, estimating the real thermal conductivity lambda of the sample to be tested by the thermal conductivity test value in the step S13 by adopting a linear interpolation method*(ii) a Is prepared from (lambda-lambda)B)/(λA-λB)＝(λ*-λB0)/(λA0-λB0) Obtaining:
λ*＝λB0+(λ-λB)·(λA0-λB0)/(λA-λB) (1)；
wherein: lambda [ alpha ]A0The true thermal conductivity of the reference sample A; lambda [ alpha ]B0True thermal conductivity for the B reference sample.
The invention also discloses a method for testing the heat conductivity coefficient of the cylindrical sample by using the standard map, which comprises the following steps: step S21, processing a reference material with a known thermal conductivity coefficient into a plurality of cylinders with the same diameter and different heights; the height of each cylinder is selected to be not less than 8 mm.
Step S22, two temperature measuring holes are radially processed on the side wall of each cylinder, the two temperature measuring holes are arranged at intervals up and down, and the hole distance is 6-80 mm; the depth of each hole is equal to or slightly less than the radius of the cylinder.
And S23, respectively placing each cylinder sample in a test auxiliary device, respectively adopting a flat-plate steady-state method heat conductivity coefficient tester, respectively inserting two thermocouples into the corresponding two temperature measuring holes, respectively heating by the flat-plate steady-state method heat conductivity coefficient tester, and respectively measuring and calculating the heat conductivity coefficient test value of each corresponding cylinder.
And step S24, drawing a data point diagram by taking the hole spacing of each cylinder as an abscissa and the heat conductivity coefficient test value as an ordinate, and fitting the data point diagram into a smooth curve to obtain a curve chart of the heat conductivity coefficient test value of the reference material.
And S25, selecting different reference materials, repeating the steps S21-S24 respectively to obtain a curve chart of the heat conductivity coefficient test value of each reference material under the diameter, and collecting the curve charts of the heat conductivity coefficient test values of the reference materials to obtain the standard maps of the heat conductivity coefficients of the different reference materials.
Step S26, repeating the step S21-step S25 in sequence, wherein in each repetition, different diameter values are selected in the step S21; and sequentially obtaining the standard maps of the heat conductivity coefficient test values of the reference materials under different diameters.
And step S27, taking a sample to be tested, wherein the expected thermal conductivity range value of the sample to be tested is known and is positioned between the maximum thermal conductivity test value and the minimum thermal conductivity test value in the standard map under the corresponding diameter.
Selecting a corresponding diameter in the standard map as a standard diameter, processing the sample to be tested into a cylinder with the standard diameter, and repeating the steps S22-S23 to obtain a heat conductivity coefficient test value lambdac of the sample to be tested; in a standard map, the hole spacing of a material to be tested is taken as an abscissa, a heat conductivity test value is taken as a corresponding ordinate, perpendicular lines of all axes are made through the abscissa and the ordinate respectively, two straight lines are crossed to obtain a cross point, heat conductivity test values lambda 1 and lambda 2 of a reference material corresponding to two standard curves adjacent to the cross point above and below are read, heat conductivity values lambda 3 and lambda 4 of the reference material corresponding to the hole spacing of 80mm of the two curves are read simultaneously, and the real heat conductivity lambda 0, lambda 0-lambda 4+ (lambda c-lambda 2) · (lambda 3-lambda 4)/(lambda 1-lambda 2) (2) of the material to be tested is estimated according to a formula (3). The value of the thermal conductivity at the hole pitch of 80mm was selected because the measured value of the thermal conductivity at the hole pitch was substantially equal to the true value, and the measured value at the hole pitch or more was taken as the true value.
The height of each cylinder is slightly higher than 80mm at most. The hole distance between the two temperature measuring holes is 6 mm-80 mm.
As shown in fig. 1, the auxiliary testing device comprises a cylindrical heat insulating sleeve 1 with two open ends, wherein two thermocouple insertion holes 2 are radially arranged on the side wall of the heat insulating sleeve 1, and the two thermocouple insertion holes 2 are arranged at intervals up and down and correspond to the positions of temperature measuring holes; two ends of the heat insulation sleeve 1 are respectively provided with a circular ring-shaped heat insulation plate 3, the outer side of each heat insulation plate 3 is respectively provided with a copper plate 4 which is tightly attached to the heat insulation plate 3, the upper copper plate 4 is used for heating, and the lower copper plate 4 is used for radiating heat.
During testing, the room temperature of the test is 25 ℃, and the cold end temperature of the thermocouple is 0 ℃. The specific process is as follows:
(1) the geometrical dimensions and mass of the sample, the lower copper plate 4 were measured with a vernier caliper and a balance, measured several times and then averaged, wherein the specific heat capacity c of the copper plate 4 was 3.805 × 102./Kg℃-1；
Measuring the sample hole spacing h and the sample radius RBAnd averaging the multiple measurements.
(2) The upper and lower surfaces of the sample are coated with heat-conducting silicone grease, the sample is placed in a cylindrical heat-insulating sleeve (1), and then the sample is placed between an upper copper plate 4 and a lower copper plate 4.
(3) Will measure T1And T2The hot end of the thermocouple is moved down and is respectively inserted into an upper temperature measuring hole and a lower temperature measuring hole of the sample, and the cold ends are both arranged in the ice-water mixture. Wherein, the upper temperature measuring hole and the lower temperature measuring hole are coated with heat-conducting silicone grease to ensure good heat conduction
(4) The temperature controller is set at 60 ℃, the switch is switched to automatic control, and the temperature can be freely set during experiments.
(5) After 20-40 minutes, the time is different according to the tested material and environment, and V is waitedT1After the reading is stable, i.e. the fluctuation is less than 0.01mV, the temperature indication is read every 2 minutes until VT2The reading was also relatively stable, (fluctuations less than 0.01mV in 0 min.
(6) The hot end of the thermocouple for measuring the temperature of the lower temperature measuring hole of the sample is moved out and inserted into the lower copper plate, and after the thermocouple is stabilized, the temperature T of the lower copper plate is recorded3The corresponding temperature potential.
(7) Measuring the steady state value T of the copper plate3The rate of heat dissipation in the vicinity. The method comprises the following specific steps: the sample was removed, the upper copper plate was adjusted to align with and make good contact with the lower copper plate, and the lower copper plate was heated. Temperature ratio T of lower copper plate3When the temperature is 10 ℃ higher and the corresponding thermoelectric voltage is about 0.39mV higher, the upper copper plate is moved away, all the surfaces of the lower copper plate are exposed to the air, the lower copper plate is naturally cooled, and the temperature is shown every 30 s.
(8) The thermal conductivity of the sample was calculated.
The cooling rate of the copper plate exposed to air on the whole surface is 2 pi RP 2+2πRPhPWherein R isPAnd hPRespectively the radius and thickness of the lower copper plate. However, during steady state heat transfer in the experiment, the area in the upper surface of the copper plate is π RB 2Is covered by the sample, since the rate of heat dissipation from the objects is proportional to their area, the expression for the rate of heat dissipation from the copper plate at steady state should be modified as:
substituting the above formula into the expression of heat transfer law, and considering ds ═ pi RB 2The thermal conductivity can be obtained:
the thermal conductivity of the sample was calculated according to equation 2.11.
In order to verify the method of the invention, metal materials of ' 45 steel ' and ' red copper ' are taken as reference samples, and ' duralumin ' (L Y12) ' is taken as a test verification sample, cylindrical samples with the diameter of 20mm are respectively processed, temperature measuring holes are respectively processed at positions 7mm away from the upper end face and the lower end face and taken as holes for inserting thermocouples for measuring the temperature, the distance between the centers of the two holes is taken as the distance between the two temperature measuring faces, as shown in figure 2, a ' YBF-3 type thermal conductivity tester ' is taken as a test instrument, a heating part is contacted with a copper plate 4, heating and testing are realized, and the results of the thermal conductivity testing values of the three samples along with the change of the hole distances are obtained through testing and calculation, as shown in tables 1, 2 and 3.
TABLE 1 relationship between "45 Steel" thermal conductivity and hole spacing
TABLE 2 relationship between "Red copper" thermal conductivity and hole spacing
TABLE 3 relationship of "duralumin" thermal conductivity to hole spacing
Data fitting is performed on the data in the table by using origin software to obtain the result shown in fig. 2, wherein the data points are actually measured results, the curve is a fitting curve, and the fitting curves of red copper, 45 steel and L Y12 are respectively as follows:
yc＝215.61+3.30336xc-0.01507xc 2(5)；
ys＝22.79+0.75613xs-0.00525xs 2(6)；
yl＝105.20+1.30667xl-0.00482xl 2(7)；
y and x in formulas (5), (6) and (7) respectively represent the thermal conductivity and the hole spacing, and subscripts c, s and l respectively correspond to red copper, 45 steel and L Y12;
from the above experimental results, it is known that when the hole pitch of the 45 steel and red copper samples is 80, the curve fitting values are 49.68 and 383.43, respectively, which are very close to the true values of 49 and 390 of the corresponding materials.
The following heat conductivity values of 45 steel (indicated by subscript A) and red copper (indicated by subscript B) as reference materials and L Y12 as verification materials were calculated using equations (5) and (6) for the hole pitches in the tables using the heat conductivity values of 45 steel and red copper as reference materials, and the results are shown as λ in Table 4AAnd λBAs shown, the results of estimating L Y12 from equation 2 are shown as λ in Table 4*As shown, the true value λ of L Y120Take 190, by λ0-λ*The deviation of the estimated value is expressed by (lambda)0-λ*)/λ0Error in the estimated values is shown and the results are shown in table 4.
TABLE 4 duralumin thermal conductivity estimation data and related results
It can be seen from the results in table 4 that, when 45 steel and red copper are used as reference samples and L Y12 is used as verification samples, the error is 0.68% when the hole spacing is 7.84mm under the current test conditions, and the maximum error is 6.3% when the hole spacing is 42.1mm, so that the error between the measured value and the actual value is less than 1% when the hole spacing is about 8mm according to the test method provided by the invention, and the requirements of teaching, scientific research and production are completely met.
Claims (5)
1. A method for testing the heat conductivity coefficient of a cylindrical sample by a punching method is characterized by comprising the following steps:
s11, selecting a sample to be tested and A, B two reference samples with different known heat conductivity coefficients, and processing the sample to be tested and the reference samples into cylinders with the same diameter and height; the height of each cylinder is not less than 8 mm;
wherein the expected thermal conductivity range value of the sample to be tested is known; in the two reference samples, the heat conductivity coefficient of one reference sample is larger than that of the sample to be detected, and the heat conductivity coefficient of the other reference sample is smaller than that of the sample to be detected;
step S12, two temperature measuring holes are radially processed on the side wall of each cylinder, the two temperature measuring holes are arranged at intervals up and down, and the hole distance is 6-80 mm; the depth of each hole is equal to or slightly smaller than the radius of the cylinder;
step S13, respectively adopting a flat-plate steady-state method thermal conductivity tester for each cylindrical sample, respectively inserting two thermocouples into the two corresponding temperature measuring holes, respectively heating by the flat-plate steady-state method thermal conductivity tester, and respectively measuring and calculating the thermal conductivity test values of the sample to be tested and the A, B reference sample, wherein the thermal conductivity test values are respectively as follows: lambda, lambdaAAnd λB；
Step S14, estimating the real thermal conductivity lambda of the sample to be tested by the thermal conductivity test value in the step S13 by adopting a linear interpolation method*；
λ*＝λB0+(λ-λB)·(λA0-λB0)/(λA-λB) (1)；
Wherein: lambda [ alpha ]A0The true thermal conductivity of the reference sample A; lambda [ alpha ]B0True thermal conductivity for the B reference sample.
2. A method for testing the heat conductivity coefficient of a cylindrical sample by a standard atlas is characterized by comprising the following steps:
step S21, processing a reference material with a known thermal conductivity coefficient into a plurality of cylinders with the same diameter and different heights; the height of each cylinder is not less than 8 mm;
step S22, two temperature measuring holes are radially processed on the side wall of each cylinder, the two temperature measuring holes are arranged at intervals up and down, and the hole distance is 6-80 mm; the depth of each hole is equal to or slightly smaller than the radius of the cylinder;
step S23, respectively inserting two thermocouples into the two corresponding temperature measuring holes by using a flat-plate steady-state method thermal conductivity tester for each cylindrical sample, heating the cylindrical sample by using the flat-plate steady-state method thermal conductivity tester, and respectively measuring and calculating the corresponding thermal conductivity test value of each cylinder;
step S24, drawing a data point diagram by taking the hole spacing of each cylinder as an abscissa and the heat conductivity coefficient test value as an ordinate, and fitting the data point diagram into a smooth curve to obtain a curve graph of the heat conductivity coefficient test value of the reference material;
s25, selecting different reference materials, repeating the steps S21-S24 respectively to obtain a curve graph of the heat conductivity coefficient test value of each reference material under the diameter, and collecting the curve graphs of the heat conductivity coefficient test values of the reference materials to obtain standard maps of the heat conductivity coefficients of the different reference materials;
step S26, repeating the step S21-step S25 in sequence, wherein in each repetition, different diameter values are selected in the step S21; sequentially obtaining standard maps of heat conductivity coefficient test values of reference materials under different diameters;
step S27, a sample to be tested is taken, the expected thermal conductivity range value of the sample to be tested is known, and the expected thermal conductivity range value of the sample to be tested is located between the maximum thermal conductivity test value and the minimum thermal conductivity test value in the standard map under the corresponding diameter;
selecting the corresponding diameter in the standard map as a standard diameter, processing the sample to be tested into a cylinder with the standard diameter, and repeating the steps S22-S23 to obtain a heat conductivity coefficient test value lambdac of the sample to be tested; in the standard map, the hole spacing of the material to be tested is used as an abscissa, the heat conductivity coefficient test value is used as a corresponding ordinate, perpendicular lines of all axes are made through the abscissa and the ordinate respectively, two straight lines are crossed to obtain a cross point, the heat conductivity coefficient test values lambda 1 and lambda 2 of the reference material corresponding to two standard curves adjacent to the cross point up and down are read, meanwhile, the heat conductivity coefficients lambda 3 and lambda 4 of the two curves corresponding to the hole spacing of 80mm are read, and the real heat conductivity coefficient lambda 0, lambda 0-lambda 4+ (lambda c-lambda 2) · (lambda 3-lambda 4)/(lambda 1-lambda 2) (2) of the material to be tested is estimated according to a formula (3).
3. A method of testing the thermal conductivity of a cylindrical sample by perforating as claimed in claim 1 or a standard map as claimed in claim 2 wherein the height of each cylinder is up to slightly more than 80 mm.
4. The method for testing the thermal conductivity of the cylindrical sample by the perforation method according to claim 1 or the method for testing the thermal conductivity of the cylindrical sample by the standard map according to claim 2, wherein the hole distance between the two temperature measuring holes is 6 mm-80 mm.
5. The method for testing the thermal conductivity of the cylindrical sample by the perforation method according to claim 1 or the method for testing the thermal conductivity of the cylindrical sample by the standard map according to claim 2, wherein the test auxiliary device comprises a cylindrical heat-insulating sleeve (1) with two open ends, two thermocouple insertion holes (2) are radially arranged on the side wall of the heat-insulating sleeve (1), and the two thermocouple insertion holes (2) are arranged at intervals up and down and correspond to the positions of the temperature measuring holes; two ends of the heat insulation sleeve (1) are respectively provided with a circular ring-shaped heat insulation plate (3), the outer side of each heat insulation plate (3) is respectively provided with a copper plate (4) tightly attached to the heat insulation plate, the copper plate (4) at the upper part is used for heating, and the copper plate (4) at the lower part is used for radiating heat.
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| CN114487008A (en) * | 2022-01-28 | 2022-05-13 | 深圳大学 | System and method for measuring composite thermal parameters of phase-change concrete member |
| CN115629103A (en) * | 2022-10-25 | 2023-01-20 | 湖南中创空天新材料股份有限公司 | Method for measuring heating coefficient of metal material and application |
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