We investigated the role of surface microstructures in two-phase microchannels on suppressing flow instabilities and enhancing heat transfer. We designed and fabricated microchannels with well-defined silicon micropillar arrays on the bottom heated microchannel wall to promote capillary flow for thin film evaporation while facilitating nucleation only from the sidewalls. Our experimental results show significantly reduced temperature and pressure drop fluctuation especially at high heat fluxes. A critical heat flux (CHF) of 969 W/cm2 was achieved with a structured surface, a 57% enhancement compared to a smooth surface. We explain the experimental trends for the CHF enhancement with a liquid wicking model. The results suggest that capillary flow can be maximized to enhance heat transfer via optimizing the microstructure geometry for the development of high performance two-phase microchannel heat sinks.
Surface Structure Enhanced Microchannel Flow Boiling
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 9, 2015; final manuscript received April 14, 2016; published online May 17, 2016. Editor: Portonovo S. Ayyaswamy.
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Zhu, Y., Antao, D. S., Chu, K., Chen, S., Hendricks, T. J., Zhang, T., and Wang, E. N. (May 17, 2016). "Surface Structure Enhanced Microchannel Flow Boiling." ASME. J. Heat Transfer. September 2016; 138(9): 091501. https://doi.org/10.1115/1.4033497
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