Heat transfer from pin-fin heat sinks under multiple impinging jets

The enhancement of heat transfer from a discrete heat source using multiple jet impingement of air in a confined arrangement was experimentally investigated. A variety of pin-fin heat sinks were mounted on the heat source and the resulting enhancement studied. Average heat transfer coefficients are presented for a range of jet Reynolds numbers (2000<Re<23000). Two jet-to-jet spacings were investigated and the results were compared to single jets of both the same orifice diameter and orifice area. A total fin effectiveness was computed for the pinned heat sinks relative to the unpinned ones, and was in the range of 3 to 6; the highest value was obtained for the largest nozzle diameter. Results for the average heat transfer coefficient were correlated in terms of Reynolds number, fluid properties and geometric parameters of the heat sinks and the orifice plate.

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