Visual device for accurately measuring multi-phase thermal conductivity factor at low temperature

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 [0001] The invention relates to a device for measuring thermal conductivity of multiple phases, in particular to a device for measuring thermal conductivity using a non-heating method and capable of real-time observation of vitrification process. Background technique [0002] At present, isolated biological cells, tissues and organs in normal temperature environment cannot survive for a long time and maintain their physiological characteristics. At present, in order to maintain the original physiological structure and function of biological materials or products for a long time, cryopreservation has been recognized as the most effective method. effective method. During the freezing and rewarming process, cell damage such as protein denaturation, lipid oxidation, energy metabolism disorder, and cell volume change caused by factors such as phase transition, osmotic pressure, thermal stress, and mechanical action cannot be ignored. How to choose the optimal coo...

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Problems solved by technology

[0003] The present invention aims to solve the problem that the glass state is easy to liquefy during the heating process, the sample temperature is not uniform caused by the temperature gradient during the freezing process, the double-layer glass tube is easy to expand and crack during the measurement process, and the temperature measured by the thermocouple is double-layer glass. To solve technical problems such as tube temperature, provide a visualization device for accurately measuring multi-phase thermal conductivity at low temperature

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