An in-situ test device for high-pressure and low-temperature thermal conductivity and heat transfer coefficient

Abstract

The invention discloses an in-situ test device of high-pressure and low-temperature heat conductivity coefficients and heat transfer coefficients. The in-situ test device comprises a high-pressure and low-temperature reaction kettle, a thermistor measurement probe, a power supply input control system and a data acquisition system, wherein a thermistor and a control circuit board are arranged in the measurement probe; the measurement probe is sealed by virtue of a high-pressure seal ring; a side resistor and a circuit protection device are arranged on the circuit board; a connecting lead with an insulating paint coating passes through a fine stainless steel tube, then passes through a high-pressure seal device, and is pressed and sealed by pressure-proof plastic; the fine stainless steel tube is spliced and fixed to the seal device by using epoxy resin; holes are uniformly formed in the fine stainless steel tube; two chambers of the high-pressure and low-temperature reaction kettles are connected with each other by virtue of a piston; and a measured sample is directly put into the upper chamber of the high-pressure and low-temperature reaction kettle. The piston is pushed by injecting liquid into the lower end of the high-pressure and low-temperature reaction kettle through a constant pressure pump, so that the measured sample in the chamber is pressed in a standardizing manner; the in-situ test device can meet the requirements of in-situ synthesis of different mediums under high pressure and at low temperature and can be used for carrying out in-situ measurement on the heat conductivity coefficients and the heat transfer coefficients of multi-phase substances in different spaces and different time.

Description

technical field [0001] The invention relates to an in-situ testing device for high-pressure and low-temperature thermal conductivity and heat transfer coefficient, belonging to the technical field of heat transfer testing. Background technique [0002] It is a relative measurement method to measure the thermal conductivity and heat transfer coefficient of different media based on the thermistor point heat source method. Supply the power specified by the thermistor through the DC power supply to make the thermistor self-heat, and the thermistor is in direct contact with the measurement object for in-situ measurement, and calculate the thermal conductivity of the medium to be measured according to the temperature attenuation data of the thermistor itself and using the calculation model and heat transfer coefficient. This technical method can be applied to measure the internal thermal conductivity and heat transfer coefficient of different porous media under different conditio...

AI Technical Summary

Problems solved by technology

The traditional hot wire method and flat surface heat source method are widely used to measure the thermal conductivity of samples under normal pressure conditions, but less used under low temperature and high pressure conditions, especially in the presence of multiphase conditions. Operational convenience is poor

In addition, because the traditional hot wire method and the flat surface heat source method usually generate a large amount of heat, under the coexistence of multiphase substances, it is easy to cause changes in the physical properties and states of the multiphase substances, resulting in large measurement errors. In the application There are certain limitations in the process, and the simultaneous measurement of thermal conductivity and heat transfer coefficient has not been realized in the traditional hot wire method and flat surface heat source method.

At present, there is no report on the in situ measurement of thermal conductivity and heat transfer coefficient in multiphase state under high pressure and low temperature conditions.

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