Test method for low-temperature thermal conductivity of fluid

A test method and thermal conductivity technology, applied in the field of low temperature thermal conductivity testing of fluids, can solve problems such as the limitation of test accuracy, and achieve the effect of ensuring accuracy

Inactive Publication Date: 2011-04-20
NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the accuracy of the test is limited

Method used

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  • Test method for low-temperature thermal conductivity of fluid
  • Test method for low-temperature thermal conductivity of fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Fix the temperature measuring thermocouple 5 at the center of the hot wire heater 6, penetrate into the sample container 2 with a diameter of about 20 mm and a length of about 150 mm, and then add the standard sample absolute ethanol to the sample The container 2 is then sealed with a rubber stopper 4 and put into the low temperature and constant temperature container 1 .

[0041] (2) Add low-temperature refrigerant 7 and set the freezing point thermostat 8 so that the temperature reaches the low temperature to be measured. After the temperature is stable, turn on the heating system composed of the standard resistor 9, the data acquisition system 10, the adjustable DC power supply 11, etc., and adjust and select the appropriate heating power. Generally, the heating voltage is about 5V, the current is about 1A, and the heating time is about 3s. At this time, the maximum temperature rise is about 3°C. Record the heating parameters and temperature rise at this time. ...

Embodiment 2

[0046] (1) Carry out by (1) of embodiment 1.

[0047] (2) Pour out the standard sample absolute ethanol, clean and dry it with a cleaning agent, add the second standard liquid ethylene glycol into the sample container 2 and seal it with a rubber stopper 4, repeat the above steps, adjust To the same low temperature and heating parameters, record the temperature rise at this time.

[0048] (3) Find out the corresponding low temperature thermal conductivity data from the average low temperature of the standard sample during the absolute ethanol test (when the standard data between the two intervals is lacking, two standard data points with an interval of no more than 15°C can be used, Linear interpolation fit out), according to the temperature rise of standard sample ethanol and standard sample ethylene glycol, calculate the low-temperature thermal conductivity of ethylene glycol liquid by formula (1).

[0049] (4) According to the comparison between the measured low-temperature...

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Abstract

A test method for the low temperature thermal conductivity of fluid belongs to the thermal conductivity test field. A test system is composed of a low temperature constant container 1, a sample container 2, a sample 3, a rubber stopper, a temperature thermocouple 5, a hot wire heater 6, a low temperature refrigerant 7, an ice point thermostat 8, a standard resistor 9, a data collection system 10,and an adjustable direct current voltage stabilizing power supply 11. The test system adopts a standard fluid of known thermal conductivity, to test a fluid sample and a standard fluid. The invention has the advantages that the test method adopts the standard fluid of known thermal conductivity as a reference object, tests a fluid sample and the standard fluid in one test system under same conditions, and eliminates or reduces system error via data processing. The test method can change the object liquid to a standard liquid, to test the two standard fluids respectively, thereby calibrating the test system to confirm the accuracy of the test system.

Description

technical field [0001] The invention relates to a test method for testing fluid thermal conductivity, in particular to a test method for fluid low-temperature thermal conductivity, belonging to the field of thermal conductivity testing. Background technique [0002] As early as the 1980s and 1990s, the University of Science and Technology of China developed the KDR-1 hot-wire rapid thermal conductivity tester, which used the "transient hot-wire method" to test the thermal conductivity of fluids such as kerosene, engine oil, and crude oil at room temperature. The 510 Research Institute of the China Academy of Space Technology adopts the "transient hot wire method" to test the thermal conductivity of grease at -50°C to +30°C, and to test the low-temperature thermal conductivity of the liquid refrigerant used in thermal control at - Tests and studies have been carried out at 110°C to +100°C. At present, using the transient hot wire method (hot wire method for short) to measure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
Inventor 张建可冀勇夫
Owner NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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