Prediction Algorithm of Pressure Drop for Impingement Cooling of Heat Sinks with Pin Fin Arrays.

Abstract

This paper is a semiempirical report on the development of a prediction algorithm of pressure drop for impingement cooling of heat sinks with pin fin arrays. The inlet orifice is relatively large and is placed over the center of the heat sink. A physical model suitable for heat sinks with pin fin arrays 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 inlet orifice, ii) the region under the inlet orifice, where the flow is parallel to the pin fins, iii) the fin base area, iv) the region where the flow is perpendicular to the pin fins except under the inlet orifice, and v) the outlet of the heat sink. Values are predicted for pressure drop of the heat sink with pin fin arrays for a variety of orifice diameters, gaps, pin diameters, fin heights and numbers of fins. These values agree with the experimental data within ±30%.