THERMAL DRIVE IN CENTRIFUGAL FIELDS - MIXED CONVECTION IN A VERTICAL ROTATING CYLINDER

Axis-symmetric secondary flows occur in a vertical rotating cylinder with a temperature difference imposed on the top and bottom ends even under zero gravity and, consequently, enhance the heat transport between two ends. The mean equivalent conductivity for mixed convection in the vertical rotating cylinder increases at first and then decreases with the rotating Reynolds number. A dimensionless parameter group Gr/(36Re1.255) to replace Gr/Re2, which is commonly used in mixed convections, is suggested to measure the relative importance of buoyancy and inertial force on the mean equivalent conductivity.