垂直矩形封闭空腔内自然对流传热的数值计算

对由两个不同温度的垂直等温壁和两个绝热或导热的水平壁所组成的二维封闭空腔内的自然对流传热进行了数值模拟；分析了瑞利数（Ｒａ）及Ａ值（高宽比）对腔内温度分布和空腔传热性能的影响，并提出了传热系数关联式．此外对高Ｒａ下在空腔中心出现的“逆向温差”现象也作了合理的解释，并校核了由Ｅ．Ｒ．Ｇ．Ｅｃｋｅｒｔ和Ｓ．Ｈ．Ｙｉｎ 提出的传热状态分区图．

Natural convection heat transfer in rectangular enclosure researched by numerical simulation

The natural convection heat transfer in a two-dimension enclosure constructed by two different temperature vertical isothermal walls and two adiabatic or conductive horizontal walls has been studied with the method of numerical simulation. The effect of Rayleigh number and value A(height to thickness ratio) on the temperature field and the performence of heat transfer are analysed and the correlation of the heat transfer coefficient are presented. As a result this paper also gives a resonable explanation for the phenomena of inverse temperature difference which arise in the core of enclosure at high Rayleigh number and modifies the extent of various heat transfer regimes suggested by E. R. G. Eckert and S. H. Yin.