Experimental investigation of flow boiling heat transfer characteristics of FC-72 in cross-linked microchannel heat sinks using thermochromatic liquid crystals

Ayman Megahed, Ibrahim Hassan, Kristina Cook

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The present study investigates the effect of cross-links on flow boiling heat transfer characteristics in rectangular microchannel heat sinks, using FC-72 as the working fluid. The silicon test section consists of 45 cross-linked microchannels, measuring 16 mm in length, with a hydraulic diameter of 248 μm. The parameters investigated include mass flux, heat flux, and exit quality, ranging from 99-275 kg/m2s, 7.2-88.8 kW/m2, and 0.01-0.71, respectively. Thermochromatic liquid crystals have been used in the present study as full-field surface temperature sensors to map the temperature distribution on the heat sink surface. The flow boiling heat transfer coefficient shows a different trend in the cross-linked design relative to the straight microchannel design. The flow boiling heat transfer coefficient increases with increasing exit quality at a constant mass flux, which is caused by the domination of the nucleation boiling mechanism in the cross-link region. The predictions obtained from the existing heat transfer correlations found in the literature significantly under-estimate the present heat transfer measurements, except for the Yu et al. (2002) correlation.

Original languageEnglish
Title of host publicationProceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
Pages1-7
Number of pages7
DOIs
Publication statusPublished - 12 Jul 2010
EventASME 2009 Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009 - Shanghai, China
Duration: 18 Dec 200921 Dec 2009

Publication series

NameProceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
Volume2

Other

OtherASME 2009 Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
CountryChina
CityShanghai
Period18/12/0921/12/09

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ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

Megahed, A., Hassan, I., & Cook, K. (2010). Experimental investigation of flow boiling heat transfer characteristics of FC-72 in cross-linked microchannel heat sinks using thermochromatic liquid crystals. In Proceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009 (pp. 1-7). (Proceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009; Vol. 2). https://doi.org/10.1115/MNHMT2009-18010