Flow and Heat Transfer Characteristics in Pin-Fin Arrays As Heat Sinks:In the Case of Stepwise Arrangement

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Using a wind tunnel, systematic measurements were conducted on heat transfer and pressure loss characteristics of pin-fin arrays having stepwise arrangement, by varying the offset pitch as a parameter. The pin-fin arrays used in the present study were made of square shaped thin (0.2 mm) pins. The measurements were carried out on the basis of modified single blow transient testing method. Additionally, the flow visualization tests were carried out utilizing fifteen times enlarged pin-array models with dye injection technique. Water was used as the test fluid. The test results clarified the effects of the pin pitch on the heat transfer performance. It is found that there is a optimum value of offset pitch.
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