CN1865958A - Heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity - Google Patents
Heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity Download PDFInfo
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- CN1865958A CN1865958A CN 200610050676 CN200610050676A CN1865958A CN 1865958 A CN1865958 A CN 1865958A CN 200610050676 CN200610050676 CN 200610050676 CN 200610050676 A CN200610050676 A CN 200610050676A CN 1865958 A CN1865958 A CN 1865958A
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Abstract
The disclosed detector for plate conductive factor of heat pipe comprises a Dewar flask with flange, a Dewar bottle cover and a hanging detection device that comprises in turns a compression board fixed by a screw, a pipe-type equal-cold plate, a pipe-type equal-heat plate, and a heater. This invention reduces heat dissipation as radiation or convection.
Description
Technical field
The invention belongs to solid thermal physical property measurement technical field, particularly heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity.
Background technology
In the research and development of some functional materials and to production run, need test accurately the coefficient of heat conductivity of material, and the measurement of coefficient of heat conductivity is vast researcher of puzzlement and producers' a difficult problem always.
The method of testing of coefficient of heat conductivity generally can be divided into two big classes: steady state method and unstable state method.Steady state method, promptly the Temperature Distribution in the sample is invariant in time steady temperature field, after sample reaches thermal equilibrium, by heat flow rate and the thermograde of measuring the sample per unit area, just can directly measure the coefficient of heat conductivity of sample.The unstable state method, Temperature Distribution in the sample is the Unsteady Temperature Field that changes along with the time, by the rate temperature change of measuring sample, measure the thermal diffusion coefficient of sample, and need not to measure heat flow rate, by λ=α * ρ * c (λ-coefficient of heat conductivity, α-thermal diffusion coefficient, ρ-density, c-specific heat) try to achieve coefficient of heat conductivity λ.
Be characterized in adopting the good advantage of flat-plate heat pipe uniform temperature, both can utilize the principle of transient state method Measuring Object coefficient of heat conductivity, heat pipe is heated tested material as the isothermal thermal source, derive the coefficient of heat conductivity that tries material by the temperature rise and the time course that obtain tested material; Also can be according to the test philosophy of steady state method Measuring Object coefficient of heat conductivity, flat-plate heat pipe respectively as the cold drawing and the hot plate of conductometer, is arranged in the both sides up and down of sample, keeps the isothermal surface on examination material two sides, be incubated with thermal insulation material more on every side, thereby realize so that the radiation loss that reduces the edge is desirable.
Flat band method is that a kind of specimen shape is the longitudinal heat flux method of disc or square plate shape.The physical model of flat band method is, produces a stable longitudinally one dimension hot-fluid in circular or square plate shaped sample, calculates the value of coefficient of heat conductivity again according to Fourier's law.For keeping in the dull and stereotyped sample one dimension hot-fluid longitudinally, adopt two approach usually: what (1) utilized sample self prevents heat waste.Sample do very thin, diameter is very big, becomes the circular dull and stereotyped of d/ δ 〉=10.There is isothermal surface preferably the central area of sample huyashi-chuuka (cold chinese-style noodles) and hot side, produces uniform one dimension hot-fluid between the isothermal surface, and the sample center is as the test section, and the part beyond the sample center plays self the heat shroud effect that prevents heat waste radially.(2) add radially heat shroud.For the radially heat waste that prevents sample and the end to heat waste, at the bottom of sample or main heating element radially with the end to limit heating element and end heating element are installed respectively.Because the constant temperature measures difference that adopts in the approach that is adopted difference or the same approach then produces the plane table thermo of different types.Compare its advantage with other method: (1) is that sample prepares easily; (2) have quite high test accuracy and test temperature.Now classified as the standard test method of low thermal conductivity material by many countries, be widely used.
The refined qin RTM-G5 of nineteen ninety Liu of Liming chemical Inst type steady state method conductometer can be simple and easy and test the coefficient of heat conductivity of thermal insulation material and compound substance exactly.Measure hot-fluid with two identical heat flow meters in the test by sample.Sample holder is between two heat flow meters, and a heat flow meter is contained on the heating radiator, and another is fitted together with well heater and heat-insulating shield, and well heater transmits heat downwards, makes sample upper surface and the lower surface generation temperature difference and adopts constant temperature oven.
Thermal Power Engineering system of Tongji University had developed TFD-1 type protective heat plate method conductometer in 1994, and protective heat plate method conductometer is to be used to measure the micrometric measurement instrument that thermal insulation material shows coefficient of heat conductivity or thermal resistance.Proving installation is two sample protective heat plate method conductometers, and it is made up of hot plate, cold drawing, sample clamp system and temperature survey and control system etc.Hot plate is the major part of conductometer, and it comprises main hot plate and protective heat plate, is made up of the constant temperature plate and the well heater of master, guarded hot plate respectively.The hot plate size that this device is selected for use is 300mm * 300mm, and main hot plate size is 150mm * 150mm, and gap width is 2mm.Constant temperature plate main, guarded hot plate is selected the 3mm aluminium sheet for use, and aluminium sheet has handling ease and the less advantage of thermal capacity.Adopt the nonmetal web member of heatproof to use the cementing agent gummed between master, the guarded hot plate.The well heater of main, guarded hot plate, requirement can produce uniform hot-fluid, and we use on insulating material evenly the controlling heating wire as the well heater of master, guarded hot plate.The specimen size of this device is 300mm * 300mm, adopts square sample that the advantage that is easy to process is arranged; The sample thickness of measuring is 20～50mm; The temperature range of measuring is normal temperature～100 ℃.
The dull and stereotyped heat flow meter conductometer of Southeast China University's stable state in 1996 is used to test the insulation material coefficient of heat conductivity.It is made up of experiment body, thermostatic water-circulator bath and test instrumentation.The sample two sides closely contact with Copper Water Jacket respectively, respectively by the thermostatted water of different temperatures, are isothermal surface in order to keep the sample two sides in the Copper Water Jacket; Be incubated with thermal insulation material (with the thick hard polyurethane foam of 0.03m) around the conductometer, to reduce the radiation loss at sample edge.
The multitude of Nanjing Forestry University in 1997 likes that the pure people of grade has used steady state thermal flowmeter method conductometer test wood-based plate coefficient of heat conductivity, steady state thermal flowmeter method test material coefficient of heat conductivity is based on the principle of one-dimensional stable heat conduction, when the temperature difference of the thickness of measured material, sample both sides and the hot-fluid by sample are known, can determine the coefficient of heat conductivity of examination material according to Fourier heat conduction law.Its steady state thermal streaming heat-transfer device is made up of experiment body, thermostatic water-circulator bath and test instrumentation.Experiment body is the plane table thermo of heat flow meter formula.Respectively by thermostatted water, be isothermal surface in the water jacket of sample both sides to keep the sample two sides; By the thermal insulation material insulation, to reduce the radiation loss of sample side, q measures with heat flux sensor around the conductometer.Therefore the sample between two isothermal surfaces just can satisfy one dimension heat conduction preferably.
Multitude in 1997 likes that pure application protective heat plate method is to the medium density fibre board (MDF) thermal Conductivity Determination.Its temperature barrier master soaking plate is made by brass, and refrigeratory is welded by brass sheet, and the chilled water of water bath with thermostatic control is shown off reverse incense coil formula and flowed in refrigeratory.For the temperature of assurance cooling surface is even, requires refrigeratory to import and export water temperature and be more or less the same.For preventing heat radiation, use the polyfoam thermal insulation all around.For reducing the thermal contact resistance between test specimen and soaking plate and refrigeratory, spring compression is all used in the analyzer upper and lower surfaces, and scale is arranged on it, and is even to guarantee the two sides spring pressure.
China Textile University adopted the two flat band methods of stable state in 1998, and the coefficient of heat conductivity of several different fibrous materials is measured.In its experimental provision, hot plate is composited by the film symmetry of two directly logical direct current heatings; The cold side temperature-uniforming plate is the copper coin of two spiral coil cooling tubes that are arranged in parallel, and the reverse end to end chilled water that leads in/out of two coiled pipes is to guarantee the uniform temperature of cold side plate.Draw the Changing Pattern of the coefficient of heat conductivity of several fibrous materials under different temperatures, the influence of different fibers and volume of air comparison coefficient of heat conductivity also has been discussed simultaneously.Its result has shown the rising of fiber coefficient of heat conductivity along with temperature, and the increase of the volume ratio of fiber and air also can cause the increase of fiber coefficient of heat conductivity.
Experimental Center of Low-Temperature Technology, Academia Sinica in 2000 utilizes to have guarded hot plate base plate conductometer measurement High Molecular Polymer's Thermal Conductivity.Its hot plate and cold drawing all adopt oxygenless copper material, and the cold of cold drawing is provided by the constant temperature ethylene glycol solution; Temperature measuring equipment adopts the differential thermocouple of diameter d=0.1mm; Sample is taken as circle, diameter with protect heating plate and equate that thickness is taken as 10mm.
Some problems that the stable state flat band method exists
The stable state flat band method is to measure poor conductor coefficient of heat conductivity a kind of method commonly used, and its theoretical foundation is to pay upright leaf law (claiming to pay upright leaf heat conduction equation formula again).The Lin Zhonghe of Central China Normal University in 1994 has proposed stable state flat band method experiment testing sample in the thermal insulation of stable state flat band method laboratory sample is analyzed will choose suitable thickness, and when experiment the testing sample side must be in addition adiabatic, just can obtain satisfied measurement result.Otherwise experiment will produce bigger error, seriously reduces the correctness of measurement result.The Xu Yong of Fujian Normal University in 1998 have proposed the influence factor of several errors of stable state flat band method in the research of the error of stable state flat band method survey poor conductor temperature conductivity: the heat radiation of (1) sample side; (2) measuring aperture does not overlap with sample surfaces; (3) the sample air-gap between surface of contact when if the big order of magnitude of the temperature conductivity of the thermal conductivity ratio air of sample (especially) up and down.The Wei Pin of University Of Suzhou was very measuring with the stable state flat band method in the experimental study of poor conductor coefficient of heat conductivity in 1998, and propose should note in the measurement of stable state flat band method: the transmission of (1) heat must be an one-way heat conduction, so the requirement of test unit side is adiabatic; (2) thermograde must be invariable, the essential correct measurement of (3) rate of heat dispation.
Summary of the invention
The purpose of this invention is to provide a kind of heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity.
It has Dewar flask, and the Dewar flask upper end is provided with flange and the Dewar flask bottle cap is installed; In Dewar flask, be hung with determinator, determinator have successively the plank of compressing, the equal cold drawing of heat pipe-type, heat pipe-type soaking plate,
Well heater, compress plank and fix with screw rod.Equal cold drawing of described heat pipe-type and heat pipe-type soaking plate are plate gravity assisted heat pipe, and Dewar flask and vacuum unit join.
The present invention has adopted the good advantage of flat-plate heat pipe uniform temperature, both can utilize the principle of transient state method Measuring Object coefficient of heat conductivity, heat pipe is heated tested material as the isothermal thermal source, derive the coefficient of heat conductivity that tries material by the temperature rise and the time course that obtain tested material; Also can flat-plate heat pipe respectively as the cold drawing and the hot plate of conductometer, be arranged in the both sides up and down of sample, keep the isothermal surface on examination material two sides according to the test philosophy of steady state method Measuring Object coefficient of heat conductivity.
Adopted the Dewar flask device.The radiation loss of well heater quantity of heat given up by heat transfer types such as radiation effectively reduced in the Dewar flask inside of gallbladder channel polishing in heat pipe-type cold drawing, heat pipe-type hot plate, well heater etc. are positioned over.Simultaneously for avoiding the device after above-mentioned the compressing to contact with bottle, said apparatus is connected with hang with the Dewar flask bottle cap by hook places in the Dewar flask with the heat-conducting mode loses heat.
Adopted the processing mode that Dewar flask is vacuumized, thereby effectively reduced the well heater quantity of heat given up by cross-ventilated radiation loss.
Description of drawings
Fig. 1 is the heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity structural representation;
Fig. 2 is heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity thermopair arrangement figure.
Embodiment
Heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity has Dewar flask 1, the Dewar flask upper end is provided with flange 2 and Dewar flask bottle cap 3 is installed, and is hung with determinator, determinator and has the plank of compressing 4, the equal cold drawing 5 of heat pipe-type, heat pipe-type soaking plate 6, well heater 7 successively, compress plank 8 and fixing with screw rod 9 in Dewar flask.Equal cold drawing 5 of heat pipe-type and heat pipe-type soaking plate 6 are plate gravity assisted heat pipe.Dewar flask and vacuum unit join.
Each parts of the present invention:
(1) Dewar flask, inside and outside pair of courage vacuumizes between courage.Arrange two in vacuum seal street corner on the bottle cap, in order to thermopair in the bottle and heater conductor are connected with extraneous; And arrange three of steel hooks, so that device places in the bottle with hang in the bottle.
(2) heat pipe-type soaking plate passes to sample equably with the heat of well heater, and what keep that a temperature uniform in-plane adopts is copper plate, and the physical dimension of plate is 100 * 100 * 25mm, and pitch of holes is 8mm, and the aperture is Φ 11mm.The plate side is respectively punched 11, hole depth 100mm, and the two side holes center differs≤0.5mm, and each aperture depth of thread 8mm joins Φ 6mm bolt plug seal, the thick 5mm of stopper, fluid injection (distilled water) back stopper periphery welds sealing and polishes flat.
(3) the equal cold drawing of heat pipe-type will be taken away equably by the heat of sample, and keep a uniform huyashi-chuuka (cold chinese-style noodles) of temperature, and it designs with the heat pipe-type soaking plate.
(4) well heater provides heat for heating process, and heating power is 1000W, employing be the conventional, electric-resistance silk, the resistance wire diameter is Φ 0.72mm, the heating groove width is 5mm.Square heater surrounding and bottom iron sheet bag embedding, it is smooth that level is preserved in the bottom.Heater strip lead-in wire (two) can connect reometer, voltage table and pressure regulator, and the physical dimension of well heater is 300 * 300mm.
(5) compress plank, be used to compress well heater, the cold and hot plate of heat pipe-type and sample, to avoid thermal contact resistance as far as possible.
(6) screw rod plays the location and compresses.
The cold and hot plate of heat pipe-type (100 * 100 * 10) places the survey up and down of sample respectively, for reducing thermal contact resistance, requires cold and hot plate and sample (100 * 100 * 15) upper and lower surface all smooth as far as possible.Well heater (100 * 100 * 4) contacts in hot plate downside and its are tight.The well heater heat reaches sample by the heat pipe-type hot plate and passes away by the hot plate type cold drawing.The temperature uniformity that utilizes the dull and stereotyped principle of heat pipe that sample is surveyed up and down.The sample upper and lower sides is respectively arranged 7 nickel chromium-nickel silicon thermocouples (k type), with the arithmetic mean of seven electric thermo-couple temperatures on each face central temperature as hot face and adiabatic face.The connected mode of thermopair and Acquisition Instrument and ice-water bath as shown in Figure 2, thermopair connects by vacuum sealing joint (production of Zhengjiang City, Jiangsu connector head factory element two factories) at Dewar bottle cap place, and well heater connects lead and also receives the power supply place of Dewar flask outside by this joint.Because the singularity of vacuum seal joint, measure each temperature spot as can be seen from Figure and need two thermopairs, a thermopair positive and negative terminal extends to outside the Dewar flask by copper conductor in the joint, negative pole after the prolongation and another are put in that the negative pole end of thermopair joins in the ice-water bath, prolong the thermopair positive terminal that and tap into data collecting instrument, the thermopair positive terminal is simultaneously near data collecting instrument in the ice-water bath, thereby realizes the measurement of some temperature.Utilization compresses plank up and down and the steel double-screw bolt compresses well heater, the cold and hot plate of heat pipe-type and sample.For avoiding the device after above-mentioned the compressing to contact with bottle, said apparatus is connected with hang with the Dewar flask bottle cap by hook places in the Dewar flask with the heat-conducting mode loses heat.
The course of work of the present invention: tested sample is put between all hot and cold plate of heat pipe-type, and the flat-plate heat pipe condensation segment of heat pipe-type soaking plate directly contacts with the tested sample lower surface, and the flat-plate heat pipe evaporator section of the equal cold drawing of heat pipe-type directly contacts with the tested sample upper surface.Check in the Dewar flask behind the vacuum condition, connect vacuum pump vacuumize make the Dewar flask internal pressure reach 0.001Pa after, close vacuum pump.Heater power source is opened, regulated transformer,, stop heating when treating temperature stabilization to 250 degree centigrade by sample upper and lower sides temperature in control of Acquisition Instrument registration and the record Dewar flask to making heater power reach 20Wa.And then utilization obtains the coefficient of heat conductivity that data based thermodynamics basic law Fourier's law calculates sample.
Claims (3)
1. heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity, it is characterized in that it has Dewar flask (1), the Dewar flask upper end is provided with flange (2) and Dewar flask bottle cap (3) is installed, be hung with determinator in Dewar flask, determinator has the plank of compressing (4), the equal cold drawing of heat pipe-type (5), heat pipe-type soaking plate (6), well heater (7) successively, compresses plank (8) and fixing with screw rod (9).
2. a kind of heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity according to claim 1 is characterized in that equal cold drawing of described heat pipe-type (5) and heat pipe-type soaking plate (6) are plate gravity assisted heat pipe.
3. a kind of heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity according to claim 1 is characterized in that described Dewar flask and vacuum unit join.
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| CNB2006100506767A CN100533133C (en) | 2006-05-11 | 2006-05-11 | Heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity |
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| CNB2006100506767A CN100533133C (en) | 2006-05-11 | 2006-05-11 | Heat-pipe flat-plate type measuring instrument for coefficient of thermal conductivity |
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| CN100533133C CN100533133C (en) | 2009-08-26 |
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| CN101806761A (en) * | 2010-04-02 | 2010-08-18 | 上海理工大学 | Instrument for measuring thermal conductivity coefficient of one-dimensional plane by using properties of graphite material |
| CN101957334A (en) * | 2010-09-26 | 2011-01-26 | 东南大学 | Low-temperature physical property measuring device of solid material |
| CN102135511A (en) * | 2010-12-29 | 2011-07-27 | 浙江银轮机械股份有限公司 | Method and device for testing heat transfer performance of fin surface of plate-fin heat exchanger |
| CN102288641A (en) * | 2011-08-18 | 2011-12-21 | 中国飞机强度研究所 | Method for measuring high temperature thermal conductivity coefficient |
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| CN101806761A (en) * | 2010-04-02 | 2010-08-18 | 上海理工大学 | Instrument for measuring thermal conductivity coefficient of one-dimensional plane by using properties of graphite material |
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| CN101957334B (en) * | 2010-09-26 | 2012-06-27 | 东南大学 | Low-temperature physical property measuring device of solid material |
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| CN102288641B (en) * | 2011-08-18 | 2014-01-08 | 中国飞机强度研究所 | Method for measuring high temperature thermal conductivity coefficient |
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| CN103646589B (en) * | 2013-11-27 | 2016-06-01 | 西安理工大学 | A kind of method for showing heat pipe radiator heat radiation efficiency affecting factors |
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| CN103792254B (en) * | 2014-01-17 | 2016-06-29 | 中国空间技术研究院 | High precision temperature control pilot system for thermo-resistance measurement |
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| CN110631770A (en) * | 2019-11-08 | 2019-12-31 | 东阳荼珀新能源科技有限公司 | Floor heating water pipe heat conductivity check out test set |
| CN110631770B (en) * | 2019-11-08 | 2020-12-29 | 盐城高新技术创业园有限公司 | Floor heating water pipe heat conductivity check out test set |
| CN110940696A (en) * | 2019-11-28 | 2020-03-31 | 航天特种材料及工艺技术研究所 | Temperature-equalizing heating device for heat conductivity test |
| CN110907491A (en) * | 2019-11-28 | 2020-03-24 | 航天特种材料及工艺技术研究所 | Low heat conduction material high temperature thermal conductivity testing arrangement |
| CN110940696B (en) * | 2019-11-28 | 2022-04-26 | 航天特种材料及工艺技术研究所 | Temperature-equalizing heating device for heat conductivity test |
| CN110907491B (en) * | 2019-11-28 | 2022-06-28 | 航天特种材料及工艺技术研究所 | Low heat conduction material high temperature thermal conductivity testing arrangement |
| CN112729992A (en) * | 2021-01-19 | 2021-04-30 | 浙江大学 | Thermophysical property testing device for organic contaminated soil |
| CN115876838A (en) * | 2023-03-02 | 2023-03-31 | 中国科学院微小卫星创新研究院 | Device for testing on-orbit heat insulation performance and aging characteristic of aerogel material |
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