Abstract
This paper is a semi-empirical report on the development of a prediction algorithm of pressure drop for impingement cooling of heat sinks with longitudinal fins. The inlet rectangular orifice (slit) is about the heat sink size in length, less than 1/4 of the heat sink size in width and is placed over the center of the heat sink. A physical model suitable for heat sinks with longitudinal fins is considered based on the flow visualization results of our previous study. According to this model, the flow region is divided into five parts : (i) the region of inlet orifice, (ii) the region between the fins under the inlet orifice, where the flow is perpendicular to the fin base, (iii) the region between the fins where the flow is parallel to the fin base except under the inlet orifice, (iv) the outlet of the heat sink, and (v) the region distant from the heat sink. Values are predicted for pressure drop of the heat sinks with longitudinal fins for a variety of orifice width, gaps, fin heights and number of fins. These values agree with the experimental data within ±30%.
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