Flow boiling of 1-methoxyheptafluoropropane (HFE 7000) in hydraulic diameter channels containing a single row of 24 inline pin fins was studied for mass fluxes from to and wall heat fluxes from to . Flow visualization revealed the existence of isolated bubbles, bubbles interacting, multiple flow, and annular flow. The observed flow patterns were mapped as a function of the boiling number and the normalized axial distance. The local heat transfer coefficient during subcooled boiling was measured and found to be considerably higher than the corresponding single-phase flow. Furthermore, a thermal performance evaluation comparison with a plain microchannel revealed that the presence of pin fins considerably enhanced the heat transfer coefficient.
Issue Section:
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.Copyright © 2010
by American Society of Mechanical Engineers
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