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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THERMAL RESISTANCE OPTIMIZATION OF MICROCHANNEL HEAT SINKS USING LIQUID GALLIUM COMPARED TO WATER BY ADJUSTING CHANNEL WIDTH AND FIN WIDTH

Get access (open in a dialog) DOI: 10.1615/IHTC16.nmt.024042
pages 7331-7338

Résumé

Liquid metals can harvest an excellent cooling performance in mini-channel (hundreds of micrometers) heat sinks owing to their high thermal conductivities. However, in the optimum configurations of mini-channel heat sinks using liquid metals, the mean velocity is rather high and the flow usually falls in turbulent regime, which results in potential erosion and structural strength problems. This implies that these optimal parameters of liquid metals are not so realistic for practical applications in mini-channel heat sinks. On the other hand, it remains unclear whether liquid metals are superior to water in micro-channel (tens of micrometer or even less) heat sinks. In the present work, a 1-D thermal resistance model was used to calculate the total thermal resistance of micro-channel heat sinks using water and liquid gallium as coolant. Critical values of micro-channel and fin widths were determined for the classic heat sink proposed by Tuckerman and Pease. It was demonstrated that with the constraints that micro-channel and fin widths are both below 100 μm, liquid gallium and water flows are kept laminar, and the total thermal resistance of heat sink using liquid gallium is smaller than that using water, a feasible region does exist in the channel width-fin width diagram. The movement of this feasible region was investigated by varying one of the geometrical or operational parameters. The findings of the present study can provide a guideline for the design and operation of micro-channel heat sinks employing liquid metals as coolant.