论文部分内容阅读
本文描述具有两个竖直导热壁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。计算参数范围为Rα=10~4～5X10~6,0.1～43.6,K~*=1～100,t~*=0.11～0.40。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,确定了相对于总温差和冷热壁内侧温差的努谢尔特数比的时间历程,并定义了冷壁传热的滞后时间概念,结果表明这些参数显著地受导热壁物性的影响。
This paper describes the results of numerical analysis of unsteady, two-dimensional, laminar natural convection heat transfer in a closed cavity with two vertical heat-conducting walls. The calculated parameters ranged from 10 ~ 4 ~ 5X10 ~ 6,0.1 ~ 43.6, K ~ * = 1 ~ 100, t ~ * = 0.11 ~ 0.40. The velocity field and temperature distribution are given. The average and local Nussure numbers of the hot and cold walls are obtained. The time history of the Nucourt numbers relative to the total temperature difference and the temperature difference between the hot and cold walls is determined. The concept of the lag time of heat transfer in cold wall is defined. The results show that these parameters are significantly affected by the thermal conductivity of the material.