ENHANCED JET IMPINGEMENT HEAT TRANSFER WITH CROSSFLOW AT LOW REYNOLDS NUMBERS

An experimental investigation was conducted to determine the heat transfer and flow characteristics for a finned surface subject to circular impinging jets with independently controlled crossflow. The jet array was configured to impinge on the top of the rectangular fins while the crossflow was directed through the channels formed by the fins. Tests were performed to determine the overall heat transfer under conditions of only jet impingement, only crossflow and combined jet with crossflow, for several fin geometries. Results are presented in terms of necessary pressure to drive the flow as well as in terms of the jet and channel Reynolds numbers. Nusselt number correlations indicated the ability to optimize the jet and crossflow with the fin geometry to obtain specific heat transfer conditions.