摘要
导出了无量纲的支配方程组，能适用于壁面为定热流或定壁温的边界条件．采用原始变量方法，利用ＳＩＭＰＬＥＣ算法进行了求解．在较为宽广的瑞利数Ｒａ和半径比范围内分别对定热流和定壁温两种情况进行了计算并得到了相应的结果．流场中存在着半月形的涡旋，而径向的温度分布在一定角度范围内有温度反转现象．平均换热Ｎｕ随Ｒａ和半径比的增加而上升，定热流的换热要略强于定壁温情况下的值．整理了水平同心套管换热的关联式，并对两种边界条件进行了比较．所得结果与有关文献进行了比较。
Non dimensional equations were given, which was applicable for the boundary condition of constant heat flux and constant wall temperature. Primitive variable and SIMPLEC method were used to solve the equations. The results within a wide range of Ra number and diameter ratios under constant heat flux and constant wall temperature boundary condition were obtained. Crescent shaped eddy exists in flow field and temperature reversion is founded in radial direction within certain angles. Average Nu number increases with the Ra number and diameter ratios. The heat transfer correlation was given and the comparison between the two boundary condition was made. The results agrees well with the other presented results.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
1999年第3期281-284,共4页
Journal of Shanghai Jiaotong University
关键词
传热学
瑞利数
水平同心套管
自然对流
数值模拟
heat transfer
Rayleigh number
horizontal concentric cylindrical annuli
natural convection
