在辐射和对流条件下肋片传热的研究

Study of Fins' Heat Transfer under the Condition of Radiation and Convection

本文研究了在辐射和对流条件下梯形肋片的传热,应用四阶龙格-库塔法和牛顿-拉伐森迭代法进行数值求解,得出肋片沿肋高方向的温度分布;进一步分析了导热系数、辐射率、肋根温度、肋高和肋间距等参数对肋片传热的影响。比较了考虑辐射矩形肋、三角形肋和不考虑幅射的梯形肋的传热情况。结果对工程设计具有重要意义。

This paper deals with the heat transfer of trapezoidal fin under the condit- ion of radiation and convection. By applying 4th order Runge-Kutta integration scheme and Newton-Raphson iteration technique in numerical solution, the lengthwise temperature distribution of the fin is obtainedj the influences of various parameters, including thermal conductivity, emissivity, temperature at the base of the fin, length of the fin, and distance between neighbouring fins, on the fins' heat transfer are analyzed. Furthermore, a comparison is made between the effects of heat transfer of different kinds of fins: the rectangular and triangular fins which taking radiation into accountl the trapezoidal fin which neglecting radiation These results are of important significance for engineering design.