水平环缝内冷水自然对流换热过程的数值模拟  

Numerical simulation on natural convection of water near the maximum density in horizontal annulus

作　　者：彭岚[1] 刘渝[1] 李友荣[1] 唐经文[1] 

机构地区：[1]重庆大学动力工程学院,重庆400030

出　　处：《重庆大学学报（自然科学版）》2008年第6期623-626,共4页Journal of Chongqing University

基　　金：重庆市自然科学基金资助项目(2006BB6222)

摘　　要：为了解水平环缝内冷水自然对流换热过程的基本规律，利用有限容积法进行了二维数值模拟，环缝外壁为0℃，内壁温度为1～10℃。结果表明，在计算范围内，内壁面的平均表面传热系数随环缝宽度的增大先减小、而后略有增大，随内壁半径的增大而单调减小；当温差小于4℃时，平均表面传热系数随温差的增大而增大，而超过4℃后，随温差的增大而减小。采用逐步线性回归方法，得到了内壁传热关联式。near the using the In order to understand the basic maximum density in a horizontal characteristics of annulus, two-di the heat transfer of natural convection of water mensional numerical finite volume method. The outer wall temperature was maintained at 0 simulation was conducted ℃, and the temperature of inner wall at 1 ℃ to 10 ℃. The results show that the heat transfer coefficient at the inner wall first decreases with increased annulus width, then increases, and then constantly decreases with the increased inner radius in the region of calculation. When the temperature difference is below 4℃, the heat transfer coefficient increases with increasing temperature difference. When the temperature difference exceeds 4 ℃, it decreases with the increase of the temperature difference. Finally, the formula of heat transfer at the inner wall was obtained by using stepwise linear regression.

关 键 词：自然对流 数值模拟 水平环缝 传热特性 

分 类 号：TK124[动力工程及工程热物理—工程热物理]