Abstract
The flow and the external forced convection around an isothermal circular cylinder, placed at various heights above a plane surface, has been investigated experimentally over the subcritical Reynolds number range 1.4 × 10 4−4 × 10 4, Reynolds number being based on the cylinder diameter. The influence of the presence of a plane boundary on drag and lift coefficients, and on both local and global Nusselt numbers, was examined. It was found that the formation of closed recirculation regions upstream and downstream of the cylinder is responsible for the occurrence of small values of the local heat transfer coefficient, especially at the rear of the cylinder. In all cases studied, the drag and global Nusselt number reached a minimum when the cylinder touched the wall; for this situation, particular attention was given to the influence of the boundary layer's thickness on the flow and on the external convection around the cylinder.
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