The heat transfer and fluid flow performance of a hybrid jet plus multi-pass microchannel heat sink in two-phase operation is evaluated for the cooling of a single large area, 3.61 cm2, heat source. The two-layer branching microchannel heat sink is evaluated using HFE-7100 as the coolant at three inlet volumetric flow rates of 150, 300, and 450 ml/min. The boiling performance is highest for the flow rate of 450 ml/min with the maximum heat flux value of 174 W/cm2. Critical heat flux was observed at two of the tested flow rates, 150 and 300 ml/min, before reaching the maximum operating temperature for the serpentine heater. At 450 ml/min, the heater reached the maximum allowable temperature prior to observing CHF. The maximum pressure drop for the heat sink is 34.1 kPa at a heat flux of 164 W/cm2. Further, the peak heat transfer coefficient value of the heat sink is 28,700 W/m2K at a heat flux value of 174 W/cm2 and a flow rate of 450 ml/min. Finally, a validated correlation of the single device cooler is presented that predicts heat transfer performance and can be utilized in the design of multi-device coolers.
Two-phase performance of a hybrid jet plus multi-pass microchannel heat sink
Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received September 26, 2018; final manuscript received June 28, 2019; published online xx xx, xxxx. Assoc. Editor: T.S. Ravigururajan.
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Joshi, S. N., Lohan, D. J., and Dede, E. M. (July 25, 2019). "Two-phase performance of a hybrid jet plus multi-pass microchannel heat sink." ASME. J. Thermal Sci. Eng. Appl. doi: https://doi.org/10.1115/1.4044347
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