Convective heat flow measurement method based on circular foil heat flow meter

Abstract

The invention discloses a convective heat flow measuring method based on a circular foil heat flow meter. The convective heat flow measuring method comprises the steps of: establishing a convective heat flow measuring mathematic model of the circular foil heat flow meter, and acquiring a circular foil temperature distribution function of the circular foil heat flow meter; establishing a correlation function of the circular foil core temperature and an output electromotive force of the circular foil heat flow meter; and measuring the output electromotive force of the circular foil heat flow meter, and calculating an average convective heat flow density measured by the circular foil heat flow meter based on the circular foil temperature distribution function and the correlation function of the circular foil core temperature and the output electromotive force of the circular foil heat flow meter. The convective heat flow measuring method realizes accurate measurement of convective heat flow in the case of unknown convective heat exchange coefficient without changing the hardware structure and use conditions of the circular foil heat flow meter.

Description

technical field [0001] The invention belongs to the technical field of convective heat flow measurement, in particular to a method for measuring convective heat flow based on a circular foil heat flow meter. Background technique [0002] Heat transfer is a ubiquitous physical phenomenon. As a basic thermophysical quantity, the measurement of heat flux has attracted extensive attention in various fields such as industrial technology and healthy environment. The circular foil heat flow meter is a heat flow sensor for large heat flow measurement. It has the advantages of stable structure and large measurement range. It is widely used in combustion chambers, fire experiments and other fields. The circular foil heat flow meter was first invented by Robert Gardon, and now it has become a well-developed commercial heat flow sensor. Companies such as Medtherm and Vatell in the United States are well-known manufacturers of the circular foil heat flow meter. [0003] The selection of...

AI Technical Summary

Problems solved by technology

[0004] However, when the circular foil heat flow meter is applied to the heat flow measurement of the convective environment, there are great limitations: (1) The sensitivity parameters of the general measurement method are obtained under the condition of radiation heat flow. For the convective heat flow measurement, the measurement results will be different There is a large error; (2) If the convective heat flow measurement results are calibrated, it is often necessary to know the convective heat transfer coefficient, which will limit the practical application of the heat flow sensor in an unknown convective environment

Images