A kind of heat flux measuring device and method

Abstract

The invention relates to a heat flux density measurement device and a heat flux density measurement method. The heat flux density measurement device comprises a plurality of thermoelectric coupling tubes (2), wherein a closed cavity (7) is formed in each tube (2) in a thickness direction of a measured wall (8); thermoelectric coupled knots (3) of a plurality of thermocouples are embedded, so that the measured wall (8) has one or more thermoelectric coupled knots at different depths to be measured; thermoelectric wires (1) connected with the thermoelectric coupled knots (3) are introduced into the cavities of the tubes (2) and are led out from the measured wall (8) through the tubes (2); and the heat flux density in the thickness direction of the measured wall (8) is obtained according to temperature change measured by a plurality of thermocouples.

Description

technical field [0001] The invention relates to the field of heat flux measurement, in particular to a heat flux measurement device and method. Background technique [0002] In the basic research in the field of heat transfer, the convective heat transfer coefficient or radiation heat transfer coefficient (or surface heat transfer coefficient of radiation heat transfer) of the fluid side is obtained by measuring the heat flux density of the wall. method. For example, the measurement of heat flux on the wall of various pipe fittings is the main way to deduce the heat transfer law of its internal fluid; An important part of the study; the heat transfer performance of the two-phase fluid in the safety injection tank is the main means to analyze the thermal stratification phenomenon, and the heat flux analysis of the water wall of the large boiler and the large metal melting system are the main factors to determine the performance of the equipment or system . However, the acc...

AI Technical Summary

Problems solved by technology

However, in some measurement methods, such as the above-mentioned Invention 1, Invention 5 and Invention 6, after installing the measurement device, the fluid flow field near the wall must be changed or the heat flux at the measurement wall must be changed by using other materials, resulting in inestimable measurement Error, the error is even much greater than the measurement error of the device itself

At the same time, the thermal conductivity measurement method of the building wall seriously destroys the flow field and adds a heat source, which is not suitable for the measurement of the heat flux density of the opposite wall

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