二维方腔自然对流熵产模拟分析  

SIMULATION ANALYSIS OF ENTROPY GENERATION IN NATURAL CONVECTION IN TWO-DIMENSIONAL QUADRATE CAVITY

作　　者：孟凡康[1,2] 高珊[2] 闫明慧[2] 

机构地区：[1]同济大学,上海201804 [2]辽宁工程技术大学,阜新123000

出　　处：《太阳能学报》2010年第10期1287-1291,共5页Acta Energiae Solaris Sinica

基　　金：辽宁工程技术大学优秀青年基金(2007A10)

摘　　要：利用热和流体流动控制方程，同时考虑了粘性耗散效应，以温差驱动的二维方腔内自然对流换热为对象，分析讨论了熵产的分布以及随着地在10^5～10^7之间的变化关系。分析结果表明：熵产主要发生在高温壁面和低温壁面，最大熵产出现在高温壁面的下侧和低温壁面的上侧；熵产的面积加权平均 随着舶呈指数形式变化；而 与Ra之间呈线性关系；在总熵产中，传热熵产占绝对比重，且随着胞的增大，其占总熵产的比例也越来越大。Based on the natural convection heat transfer driven by temperature difference in two-dimensional quadrate cav- ity, the entropy generation distribution and variation with different Ra between 10^5 - 10^7 was analyzed by using governing equations of heat and fluid flow and considering the effect of viscous dissipation. The results show that entropy generation mainly occurs on high temperature wall and low temperature wall, the maximum of entropy generation occurs on the down- side of high temperature wall and the upside of low temperature wall, the weighted area average of entropy generation area Sgen varies exponentially with Ra, Nmi/Nm varies linearly with Ra, and the entropy generation by heat transfer is dominant in total entropy generation and increases with bigger Ra.

关 键 词：二维方腔 自然对流换热 熵产分布 热线 数值模拟 

分 类 号：TK0[动力工程及工程热物理]