竖直同心套筒内的混合对流

MIXED CONVECTION IN A VERTICAL ROTATING ANNULUS

本文对竖直同心套筒内的混合对流进行了数值模拟,其甲上下端盖加热或冷却,内、外简绝热并与端盖一起旋转.计算表明,在离心力场热驱动流和哥氏力的共同作用下,当量导热系数K_(eqm)开始随Re增大而增大,继后却随着Re增大而减少,证明了在一定条件下旋转流能弱化传热.

A numerical investigation of mixed convection of air in a vertical rotating annulus with temperature difference imposed on the top and bottom ends has been carried out. It is found that the mean equivalent conductivity increases at first and then decreases with rotating Reynolds number due to the action of thermal drive in centrifugal fields and the suppresion of natural convection by Coriolis force. It shows that the heat transfer can be weakened by fluid rotation under some conditions.