Journal
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
Volume 138, Issue 9, Pages -Publisher
ASME
DOI: 10.1115/1.4033497
Keywords
microchannel flow boiling; surface microstructures; flow instabilities; critical heat flux
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Funding
- Office of Naval Research (ONR) [N00014-15-1-2483]
- Masdar Institute of Science and Technology (Masdar Institute), Abu Dhabi, UAE [02/MI/MI/CP/11/07633/GEN/G/00]
- Massachusetts Institute of Technology (MIT), Cambridge, MA [02/MI/MI/CP/11/07633/GEN/G/00]
- Battelle Memorial Institute
- Air Force Office of Scientific Research (AFOSR)
- Singapore-MIT Alliance for Research and Technology (SMART)
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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/cm(2) 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.
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