在复杂边值条件下非稳态肋片传热的最优化──（Ⅱ）

Optimization of Unsteady Heat Transfer of a Fin under Complex Boundary Value Conditions ──(Ⅱ)

研究了在辐射和对流同时作用下肋根温度作周期性变化时矩形肋片的传热特性．首先对主控微分方程组进行离散化处理，并籍助数值计算方法进行求解，然后详细分析了肋片的温度分布与各种热特性参数的变化规律．建立了非稳态肋片传热的温度边界层新概念．

The heat transfer performance of a rectangular fin during periodic fin base temperature change is studied under simultaneous action of radiation and convection. The first part includes a mathematical modeling of finned heat transfer under this boundary conditions; a derivation of corresponding main control differential equation; and a precision solution of equation under simplified way; and the regular pattern of the change of heat distribution with fin length and time and Biot's criterion measure.