单个局部内热源和外部加热同时作用时封闭空腔内的自然对流换热

NATURAL CONVECTION HEAT TRANSFER IN AN EXTERNALLY HEATED ENCLOSURE WITH A LOCAL INTERNAL HEAT SOURCE

本文描述同时由一个局部内热源和外部加热引起的封闭空腔内非稳态、二维、层流自然对流换热的数值分析结果,研究了外部雷利数、局部内热源相对强度、位置及尺寸大小的影响。给出了速度场和温度分布,得到了热壁和冷壁的平均和局部努谢尔特数及平均努谢尔特数随时间的变化。

Numerical study results of natural convection in an externally heated enclosure containing a local internal heat source are described, the effects of external Rayleigh number, relative internsity of the local internal heat source, and position and size of the heat source on natural convection in an enclosure are systematically analysed, and the unsteady and steady flow and heat transfer performances are given.