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A New Method of Determining the Convective Heat-Transfer Coefficient

Rong-Hua Zhang and Heng-Jing Nie (Hefei University of Technology, Hefei 230009)  
The convective heat-transfer coefficient is one of the important parameters with which the problem of heat conduction accompanied by convection can be solved. In order to acquire the temperature pattern in machine parts, the convective heat-transfer coefficient on the surfaces of machine parts ought to be determined. In this paper, a new method was presented with which the convective heat-transfer coefficient can be determined accurately. Experiments for determining the convective heat-transfer coefficient were carried out and described in detail. Based on the mathematical analysis of heat-transfer problems―the lumped parameter analysis of unsteady-state heat conduction solutions, the convective heat-transfer coefficient was determined under given conditions. The influence of various parameters on the measuring accuracy of the convective heat-transfer coefficient was analyzed quantitatively. This new method has proved itself to be convenient and of high accuracy (with a relative error smaller than 1.6%).
【CateGory Index】: TK124
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