Heat Sink Design and Optimization
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ MUNITIONS ENGINEERING Picatinny Arsenal
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Heat sinks are devices that are used to enhance heat dissipation from hot surfaces to cooler ambient air. Typically, the fins are oriented in a way to permit a natural convection air draft to flow upward through rectangular U-channels, or ducts, formed by the fins. Heat sink design goals may vary, but in this report, optimization of the vertical heat sink is the main objective. Heat transfer from the heat sink consists of radiation and convection from both the intra-fin passages and the unshielded surfaces of two outer fins. In this report, both parts are considered separately. The resulting model is coded in a Microsoft Excel spreadsheet program agrees with published experimental and numerical results. A sample problem of an electronic box dissipating 250 W of heat with an attached rectangular sink was considered in this report. The design and optimization of the heat sink to meet requirements was performed and the results are discussed. A parametric study of the heat sink was also performed to assess geometric influence on its performance.