This paper presents the numerical analysis of an impingement heat sink designed for use with a specific blower as a single unit. Shat et al. (2002) had performed a fin shape optimization study for the same heat sink and concluded that a de populated central zone, just under the center of the fan, provides a better thermal performance as compared to the heat sink geometries with fin material under the fan. The results presented in this paper are an extension to the study described in Shah et al. (2002). The effects of removal of fin material from the end fins, the total number of fins, and, the reduction in the size of the hub have been investigated. The removal of fin material from the end fins results in the better thermal and hydraulic performance. The reduction in the size of the hub causes a more uniform distribution of air inside the heat sink. The increase in the number of fins indicates a slightly better thermal performance, accompanied by a considerably increased pressure drop. Finally a new optimal heat sink design has been reported. This design is shown to perform better as compared to the original heat sink design under the actual fan operating characteristics.

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