The present study explores experimentally the mechanism of critical heat flux (CHF) of FC-72 in a 10 parallel diverging microchannel heat sink with different distributions of artificial nucleation sites (ANS). The effects of mass flux and number of ANS with or without degassing on CHF of FC-72 are investigated. During CHF, flow visualization shows that the dryout of liquid film in annular flow appears near the outlet region with frequent rewetting of liquid film with slug bubble or rewetting of liquid column on the dryout surface. The results demonstrate that diverging microchannels with ANS distributed uniformly along the whole channel (Type-2 system) shows better flow boiling performance and higher CHF and can be recommended as a high-heat-flux microchannel heat sink. Moreover, five CHF correlations in the literature for flow boiling in microchannels are compared, which generally underpredict the CHF data of the present study. This suggests that the present diverging design with ANS enhances the CHF. The comparison also reveals that Bowers and Mudawar correlation predicts the present data best with MAE of 15.8% for the type-2 system.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4936-1
PROCEEDINGS PAPER
Mechanism of Critical Heat Flux for Convective Boiling of FC-72 in a Diverging Microchannel Heat Sink Available to Purchase
Chun Ting Lu,
Chun Ting Lu
National Tsing Hua University, Hsinchu, Taiwan
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Chin Pan
Chin Pan
National Tsing Hua University, Hsinchu, Taiwan
Search for other works by this author on:
Chun Ting Lu
National Tsing Hua University, Hsinchu, Taiwan
Chin Pan
National Tsing Hua University, Hsinchu, Taiwan
Paper No:
IHTC14-22750, pp. 489-495; 7 pages
Published Online:
March 1, 2011
Citation
Lu, CT, & Pan, C. "Mechanism of Critical Heat Flux for Convective Boiling of FC-72 in a Diverging Microchannel Heat Sink." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 1. Washington, DC, USA. August 8–13, 2010. pp. 489-495. ASME. https://doi.org/10.1115/IHTC14-22750
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