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Abstract
A detailed numerical study, using the vorticity-velocity method, has been conducted to examine the flow and heat transfer characteristics of wall transpiration on mixed convection in the entrance region of rectangular ducts rotating about an axis parallel to the duct axis. Thermal boundary conditions of uniform heat flux (VHF) and uniform wall temperature (UWT) were considered. The investigation was presented for various parameters, wall Reynolds number Rew, rotational Reynolds number J, rotational Grashof number GrΩ, and aspect ratio γ. The predicted results disclosed that the wall transpiration effect has considerable impact on the flow and heat transfer characteristics. Results also showed that both ƒ Re and Nu are enhanced with an increase in J or GrΩ, except for the range of J < 400 or GrΩ< 1000. Wall transpiration effects are more significant for the UWT case than for the UHF case. It is also noted that the secondary vortex induced by the buoyancy effect in the entrance region was stronger for the UWT case than for the UHF case. In addition, the strength of the secondary vortex is weaker for the case of the parabolic velocity condition at the inlet than for the uniform velocity condition at the inlet.