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<p>This was a two-part numerical study using ANSYS Fluent to develop novel heat sink concepts from first principles. The objective of this research was to highlight geometric structures that incorporate the principles of the stack effect to improve the heat transfer capability of a heat sink under natural convection. The first part investigated the heat transfer/fluid flow characteristics of vertically aligned tubes. The gaps between tubes break up the thermal and velocity boundary layers and the moving fluid within a tube entrains the cooler ambient air surrounding the gap, thus increasing mass flow rate and average Nusselt number through each tube. The optimal gap-to-length ratio varies depending on the number of tubes in the system. The second part built upon the insight gained to develop heat sinks to compare to pin-fin heat sinks. A tube system heat sink provides a significant improvement in the heat transfer capability over a circular pin-fin arrangement, demonstrated by an increase in both the overall heat transferred and average heat transfer coefficient. The principles discussed in this study have the potential to expand the capability of natural convective heat transfer.
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<br>Subjects: natural convection; free convection; passive cooling; heat sink; tube system; pin-fin; hollow pin-fin; heat sink design</div>
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Fletcher, Derek E.</div>
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