Quasi-local heat transfer coefficients were measured on a cylinder on which a circular jet impinged in crossflow. The jet diameter and the distance between the initiation of the jet and the cylinder surface were varied parametrically, as was the jet Reynolds number. The measurements showed that the axial distribution of the heat transfer coefficient peaked at the impingement point. For a fixed jet diameter and Reynolds number, the peak heat transfer coefficient increased as the distance between the initiation of the jet and the cylinder surface decreased. The peak coefficient also increased with decreasing jet diameter at fixed values of the jet initiation distance and the Reynolds number. User-oriented correlations of the peak Nusselt number with the geometrical parameters and with the Reynolds number were derived. The dropoff of the heat transfer coefficient with increasing axial distance from the impingement point was more rapid for smaller jet initiation distances (at a fixed jet diameter and Reynolds number) and for smaller jet diameters (at a fixed initiation distance and Reynolds number). The impingement pattern was examined by flow visualization.

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