Abstract
This paper presents the latest progress on characterization of our membrane assisted phase-change heat sinks at conditions suitable for implementation in data centers. Experiments are conducted using water as the working fluid at a saturation pressure of 16 kPa, corresponding to a saturation temperature of ∼55 °C. This temperature is sufficiently lower than the silicon junction temperature of ∼80 °C. As anticipated, the overall performance of the membrane-assisted heat sink at sub-atmospheric pressure is lower compared to analogous tests at atmospheric pressure. In agreement with previous studies on membrane-assisted heat sinks, the critical heat flux limit increases with enhancement of the heat transfer area ratio and liquid space pressure. We report a maximum heat flux of 670 W/cm2 on a surface with enhanced area ratio of 3.45, multiple times greater than the heat fluxes reported hitherto by comparable two-phase heat sinks in literature. Heat transfer coefficients as high as 890 kW/m2-K are obtained. We compare the thermal performance of this device with other existing technologies including conventional microchannel heat sinks, thermosyphons, cold plates, jet impingement, and analyze its system level benefits.
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