CN102645450A - Visual device for accurately measuring multi-phase thermal conductivity factor at low temperature - Google Patents
Visual device for accurately measuring multi-phase thermal conductivity factor at low temperature Download PDFInfo
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- CN102645450A CN102645450A CN2012101349256A CN201210134925A CN102645450A CN 102645450 A CN102645450 A CN 102645450A CN 2012101349256 A CN2012101349256 A CN 2012101349256A CN 201210134925 A CN201210134925 A CN 201210134925A CN 102645450 A CN102645450 A CN 102645450A
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Abstract
The invention relates to a visual device for accurately measuring a multi-phase thermal conductivity factor at a low temperature. The visual device comprises a quartz box, a cold source copper block, a heat source copper block and borosilicate glass, the cold source copper block and the heat source copper block are symmetric, the quartz box and the borosilicate glass can be placed between the cold source copper block and the heat source copper block, a test bench is formed on one side of the borosilicate glass close to the heat source copper block, a cold source channel and a heat source channel are arranged in the cold source copper block and the heat source copper block respectively, a cold source inlet and a cold source outlet are arranged on the cold source copper block, a constant-temperature water inlet and a constant-temperature water outlet are arranged on the heat source copper block, and surface-mounted thermoelectric couples are placed on two inner sides of the quartz box and two sides of the borosilicate glass respectively. The device is simple in structure, fine in tightness and comfortable in operation and observation. The thermal conductivity factor of a vitreous body can be accurately measured, and thermal conductivity factors of other liquid, suspending liquid, solid and vitreous body samples at a normal temperature and the low temperature can also be measured. Besides, state changes of the samples at the low temperature are recorded by a camera.
Description
Technical field
The present invention relates to a kind of device that records of many things phase coefficient of heat conductivity, particularly a kind of device that uses non-heating means to record coefficient of heat conductivity, and can carry out the device that records of Real Time Observation to the vitrifacation process.
Background technology
At present; Stripped biological cell, tissue and organ under normal temperature environment can't long-term surviving and keep its physiological property constant at present; For making long-term original physiological structure and the function of keeping of biomaterial or product, cryopreservation has been acknowledged as effective method.Freeze with the rewarming process in, the cellular damage such as protein denaturation, lipid oxidation, energetic supersession disorder and cell volume variation that cause because of factors such as phase transformation, osmotic pressure, thermal stress, mechanical effects can not be ignored.How selecting best rate of temperature fall, rewarming speed and evade cellular damage through adding suitable cryoprotective agent, is to improve the key of preserving quality.When preserving, vitrifacation improves a kind of effective preserving type of biosome survival rate.Vitrifacation is restricted by low-temperature protection agent concentration and two kinds of factors of rate of temperature fall, so the coefficient of heat conductivity of cryoprotective agent research becoming emphasis.The fluid thermal conductivity measurement method of generally acknowledging the most at present is a heat-pole method, if use heat-pole method to measure cryoprotective agent, the heating of hot line causes the vitreum around the hot line to undergo phase transition, and causes measuring error.Chinese patent 200920071383 discloses a kind of visualization device of nanometer cryoprotective agent thermal conductivity measurement, has proposed through the coefficient of heat conductivity of flat plate heat comparative method for measuring nanometer cryoprotective agent in the vitrifacation process; Avoided using the classic method of heating heat conducting coefficient measuring, utilized relative method to record the sample coefficient of heat conductivity, but ignored cryoprotective agent and in temperature-fall period, got state variation; If rate of temperature fall is crossed when slow; The cryoprotective agent crystallization, possible spalling dual-layer vacuum glass pipe is if rate of temperature fall is enough fast; The cryoprotective agent vitrifacation; Smaller volume, the temperature that the SMD thermopair measured temperature that then is attached to double-layer glass tube is not a cryoprotective agent influences measuring accuracy.
Summary of the invention
The present invention will solve that glassy state liquefies easily in the heating process; The specimen temperature that can be caused by thermograde in the freezing process is inhomogeneous; Be prone in the measuring process the double-layer glass tube spalling; Reaching the thermopair measured temperature is technical matterss such as double-layer glass tube temperature, and the visualization device of many things phase coefficient of heat conductivity under a kind of accurate measurement low temperature is provided.
The technical solution adopted for the present invention to solve the technical problems is:
The visualization device of many things phase coefficient of heat conductivity comprises quartzy box, the low-temperature receiver copper billet under a kind of accurate measurement low temperature; The thermal source copper billet, Pyrex are characterized in: low-temperature receiver copper billet and thermal source copper billet symmetric arrangement; Place quartzy box and Pyrex in the middle of low-temperature receiver copper billet and the thermal source copper billet, and Pyrex are respectively equipped with low-temperature receiver passage and thermal source passage near thermal source copper billet one side formation test board in low-temperature receiver copper billet and the thermal source copper billet; Have low-temperature receiver on the low-temperature receiver copper billet and advance, outlet has thermostatted water on the thermal source copper billet and advances; Outlet, inner two sides of quartzy box and Pyrex both sides are placed SMD thermopair respectively.
Low-temperature receiver copper billet and thermal source copper billet outside are surrounded by low-temperature receiver copper billet heat-insulation layer and thermal source copper billet heat-insulation layer respectively.
Be respectively equipped with square groove on low-temperature receiver copper billet and the thermal source copper billet in order to fixing quartzy box and Pyrex.
Low-temperature receiver copper billet heat-insulation layer and thermal source copper billet heat-insulation layer add in order to the fixing band of Cooling and Heat Source copper billet.
Camera is installed on quartzy box top, is used for writing down the state variation of the temperature-fall period of sample.
Beneficial effect of the present invention is: this device is made up of two copper billets of high low temperature of temperature constant; Quartzy box is vertically put, though mother glassization or crystallization at low temperatures, can be with quartzy box spalling yet; SMD thermopair measured temperature is a sample temperature, measures accurately.The design of band makes and the Cooling and Heat Source uniformity of temperature profile reduces the air thermal resistance, and makes mounted cast more near the one dimension conduction model.This apparatus structure is simple, good airproof performance, operation and observation are comfortable.Can accurately measure Vitrea coefficient of heat conductivity, and other liquid of energy measurement, suspending liquid, solid and the coefficient of heat conductivity of vitreum sample under normal temperature and low temperature.The state variation under the sample low temperature is write down in shooting simultaneously.
Description of drawings
Fig. 1 is a structural front view of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is a cut-open view of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Extremely shown in Figure 3 like Fig. 1; The visualization device of many things phase coefficient of heat conductivity under the accurate measurement low temperature of the present invention comprises quartzy box 2, low-temperature receiver outlet 3, low-temperature receiver copper billet 4, low-temperature receiver copper billet heat-insulation layer 5, band 7, bolt 8, thermal source copper billet heat-insulation layer 10, thermal source copper billet 11, SMD thermopair 12, Pyrex 13, camera 14 etc.
Test board is made up of the low-temperature receiver copper billet of symmetric arrangement 4 and thermal source copper billet 11 and quartzy box 2 and Pyrex 13.Be respectively equipped with very thin cavity low-temperature receiver (120 ℃) passage 16 and thermal source (20 ℃) passage 17 in low-temperature receiver copper billet 4 and the thermal source copper billet 11; Have low-temperature receiver import 6 and low-temperature receiver outlet 3 on the low-temperature receiver copper billet 4; Have thermostatted water import 9 and thermostatted water outlet 1 on another thermal source copper billet 11; Be respectively equipped with square groove 15 on low-temperature receiver copper billet 4 and the thermal source copper billet 11, in order to fixing quartzy box 2 and Pyrex 13.Pyrex 13 are near thermal source copper billet 11 1 sides, and Pyrex 13 can be chosen to the Pyrex 13 of different-thickness according to different rate of temperature fall.Testing sample is placed in the quartzy box 2 near low-temperature receiver copper billet 4 these sides.Maximum temperature difference between two copper billets can be controlled in 140 ℃, and cooldown rate is 1 ~ 500 ℃ of per minute.
(1) quartzy box 2: in order to place testing sample, quartzy thermal expansivity is little, and in temperature changing process, volume change is little, measures accurately.Quartzy box 2 is vertically put, though mother glassization or crystallization at low temperatures, can be with quartzy box 2 spallings yet, during the measure solid sample, sample size is made into quartzy box size, and itself and quartzy box 2 are replaced.Quartzy box 2 promptly can be used as thermal insulation material, can form be observed the vitrifacation process of nano material again.
(2) low-temperature receiver copper billet 4 and thermal source copper billet 11: the both sides that are placed on quartzy box 2 and Pyrex 13 of the two symmetry, two copper billet inside are established very thin cavity respectively as low-temperature receiver passage 16 and thermal source passage 17, wherein; Have low-temperature receiver on the low-temperature receiver copper billet 4 and advance, outlet 6,3; Having thermostatted water on the thermal source copper billet 11 advances; Outlet 9,1, and the mode that goes out on advancing down; The Cooling and Heat Source temperature field is even, and on two copper billets, has the square groove of placing quartz glass and Pyrex.
(3) Pyrex 13: square for standard; Size is identical with the inside dimension of quartzy box 2; The thickness of Pyrex 13 can be changed the Pyrex of different-thickness according to different needs, and the optional thickness of Pyrex is 5mm-10mm.
(4) 12: two of SMD thermopairs are attached to quartzy box 2 inner both sides, and two are attached to Pyrex 13 both sides in addition, in order to confirm the temperature difference between 13 two surfaces of Pyrex and two surfaces of vitreum.
(5) band 7: add band at low-temperature receiver copper billet heat-insulation layer 5 and thermal source copper billet heat-insulation layer 10; In order to fixing Cooling and Heat Source copper billet 4; Reduce the air thermal resistance, and do not influence the Cooling and Heat Source temperature field, make mounted cast more near the one dimension conduction model.
(6) camera 14: camera 14 is installed, the state variation in the temperature-fall period of record sample on quartzy box 2 tops.
This device is vertically put quartzy box 2, when the cryoprotective agent volume change, can be with quartzy box 2 spallings yet, and the temperature that SMD thermopair 12 is measured is the temperature of cryoprotective agent.The design of band 7 makes the Cooling and Heat Source uniformity of temperature profile, and mounted cast is measured accurately more near one dimension heat conduction.The camera 14 of top design simultaneously can write down the metamorphosis of sample in the vitrifacation process.
When the present invention used: the high pressure nitrogen in the nitrogen gas container was through after the cooled with liquid nitrogen; Get into low-temperature receiver passage 16 by low-temperature receiver import 6 under pressure; Make low-temperature receiver copper billet 4 temperature reduce to-120 ℃ (temperature can be demarcated through SMD thermopair 12); Low-temperature receiver is discharged through low-temperature receiver outlet 3 after the heat exchange; The warm water of water bath with thermostatic control (20 ℃) gets into thermal source passage 17 through the pump circulation by thermostatted water import 9, and the temperature stabilization that makes thermal source copper billet 11 is 20 ℃ (temperature can be demarcated through SMD thermopair 12), and warm water is got back to constant water bath box through thermostatted water outlet 1 after the heat exchange.Because the temperature of low-temperature receiver copper billet 4 and thermal source copper billet 11 is to be controlled by the fluid of flow through low-temperature receiver passage 16 and thermal source passage 17, thus the temperature that the flow of fluid is controlled copper billet can be changed, to reach different rate of temperature fall.
The replaceable scope of the thickness of Pyrex 13 is 5 ~ 10 millimeters, 10 ~ 140 ℃ of the temperature difference variable ranges between low-temperature receiver copper billet 4 and the thermal source copper billet 11, and cooling velocity can accurately be controlled, and in 1 ~ 500 ℃/minute, regulates.
The present invention is used for the device of measuring samples at normal temperature solid phase coefficient of heat conductivity in the low temperature glass process; Simultaneously it can also be measured other samples and (comprises liquid; Suspending liquid and solid) coefficient of heat conductivity under from normal temperature to low temperature; Device comprises two square copper billets that have very thin cavity, the transparent quartzy box and the Pyrex of standard thickness.Add band in the heat-insulation layer outside, be used for fixing copper billet, guarantee the copper billet uniformity of temperature profile, make mounted cast more near one dimension heat conduction, measure accurately, there is square groove on the surface of copper billet, in order to fixing quartzy box and Pyrex.There is fluid inlet and outlet the both sides of copper billet.Quartzy box is used for placing the thickness of testing sample (need use quartzy box during the measure solid sample) Pyrex and can changes as required.The top camera can be made a video recording and write down the mother glass process.Through regulating the thickness of low-temperature receiver flow and Pyrex, can accurately control the temperature of Pyrex surface and sample both side surface, thereby obtain the situation of change of coefficient of heat conductivity in the mother glass process.
Claims (5)
1. a visualization device of accurately measuring many things phase coefficient of heat conductivity under the low temperature comprises quartzy box (2), low-temperature receiver copper billet (4); Thermal source copper billet (11), Pyrex (13) is characterized in that: said low-temperature receiver copper billet (4) and thermal source copper billet (11) symmetric arrangement; Place quartzy box (2) and Pyrex (13) in the middle of low-temperature receiver copper billet (4) and the thermal source copper billet (11), and Pyrex (13) are respectively equipped with low-temperature receiver passage (16) and thermal source passage (17) near thermal source copper billet (11) one sides formation test board in said low-temperature receiver copper billet (4) and the thermal source copper billet (11); Have low-temperature receiver on the low-temperature receiver copper billet (4) and advance, outlet (6,3); Having thermostatted water on the thermal source copper billet (11) advances; Outlet (9,1), inner two sides of quartzy box (2) and Pyrex (13) both sides are placed SMD thermopair (12) respectively.
2. the visualization device of many things phase coefficient of heat conductivity under the accurate measurement low temperature according to claim 1 is characterized in that: said low-temperature receiver copper billet (4) and thermal source copper billet (11) outside are surrounded by low-temperature receiver copper billet heat-insulation layer (5) and thermal source copper billet heat-insulation layer (10) respectively.
3. the visualization device of many things phase coefficient of heat conductivity under the accurate measurement low temperature according to claim 1 is characterized in that: be respectively equipped with the square groove (15) in order to fixing quartzy box (2) and Pyrex (13) on said low-temperature receiver copper billet (4) and the thermal source copper billet (11).
4. the visualization device of many things phase coefficient of heat conductivity under the accurate measurement low temperature according to claim 1 is characterized in that: camera (14) is installed on said quartzy box (2) top, is used for writing down the state variation of the temperature-fall period of sample.
5. the visualization device of many things phase coefficient of heat conductivity under the accurate measurement low temperature according to claim 2 is characterized in that: said low-temperature receiver copper billet heat-insulation layer (5) and thermal source copper billet heat-insulation layer (10) add in order to the fixing band of Cooling and Heat Source copper billet (7).
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| CN2012101349256A CN102645450A (en) | 2012-05-04 | 2012-05-04 | Visual device for accurately measuring multi-phase thermal conductivity factor at low temperature |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226243A (en) * | 2016-08-02 | 2016-12-14 | 大连理工大学 | A kind of utilize the method for cooling procedure and its condensed state structure relation in thermally indicating material observation Injection moulded part mould |
| CN110702730A (en) * | 2019-09-29 | 2020-01-17 | 重庆科技学院 | Fluid heat transfer capacity quantitative determination method |
| CN112881463A (en) * | 2021-01-19 | 2021-06-01 | 西安交通大学 | Method for visually processing temperature change of liquid in container |
| CN114112812A (en) * | 2021-10-29 | 2022-03-01 | 华北电力大学 | Phase change particle testing device, solid-liquid phase change mechanism visualization experiment table and method |
| CN114755262A (en) * | 2022-06-15 | 2022-07-15 | 南京瑞为新材料科技有限公司 | Test system and test method for testing heat conduction capability of sample pieces in batch |
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| CN202562869U (en) * | 2012-05-04 | 2012-11-28 | 上海理工大学 | Visualization device for accurately measuring multi-phase thermal conductivity coefficients at low temperature |
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Patent Citations (6)
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| US6824306B1 (en) * | 2002-12-11 | 2004-11-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Thermal insulation testing method and apparatus |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226243A (en) * | 2016-08-02 | 2016-12-14 | 大连理工大学 | A kind of utilize the method for cooling procedure and its condensed state structure relation in thermally indicating material observation Injection moulded part mould |
| CN110702730A (en) * | 2019-09-29 | 2020-01-17 | 重庆科技学院 | Fluid heat transfer capacity quantitative determination method |
| CN112881463A (en) * | 2021-01-19 | 2021-06-01 | 西安交通大学 | Method for visually processing temperature change of liquid in container |
| CN114112812A (en) * | 2021-10-29 | 2022-03-01 | 华北电力大学 | Phase change particle testing device, solid-liquid phase change mechanism visualization experiment table and method |
| CN114112812B (en) * | 2021-10-29 | 2024-05-24 | 华北电力大学 | Phase change particle testing device, solid-liquid phase change mechanism visualization experiment table and method |
| CN114755262A (en) * | 2022-06-15 | 2022-07-15 | 南京瑞为新材料科技有限公司 | Test system and test method for testing heat conduction capability of sample pieces in batch |
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Application publication date: 20120822 |