Laminar forced convective heat transfer in rotating rectangular ducts. 2nd report. Numerical analysis in the case of negative rotation.

Abstract

A numerical investigation was made on fully developed laminar forced convective heat transfer in curved rectangular ducts rotating at a constant angular velocity about an axis through the center of curvature of ducts. Thermal boundary conditions of fluid flow are assumed to be subject to uniform wall heat flux. Navier-Stokes and energy equations are solved by the finite difference method for air. The case for the negative rotation of a duct is considered. Velocity and temperature fields are obtained for various rotation rates and Re numbers. It is found that an additional pair of vortices appears in the vicinity of the inner wall under the influence of Coriolis force and in the vicinity of the outer wall under the influence of centrifugal force. The friction factors and Nusselt numbers are also obtained. The numerical results in regard to the friction factors are in good agreement with experimental results obtained by other researchers.