Liquid-vapour interface behaviours and the pressure drop fluctuation during flow boiling in a single rectangular micro-channel with high aspect ratio were experimentally investigated in the present study. A micro-channel with the hydraulic diameter of 727 μm was chosen, the aspect ratio of which was 10. FC-72 was used as the working liquid. Wide ranges of mass fluxes and heat fluxes were tested to study bubble dynamics and hydraulic instabilities during flow boiling. With the aid of high speed camera, various liquid-vapour interface behaviours during flow boiling were captured, such as bubble nucleation and growth, interface deformation, recoiling and rewetting. Based on the interface movement, the evaporation rate of the liquid was discussed. Evaporation rates of bubble nose and bubble tail at different mass fluxes and heat fluxes were compared. Besides, the effects of thermal and flow conditions on bubble geometry were discussed. Moreover, the pressure fluctuations resulting from boiling instabilities was remarkable. Fluctuation frequency was largely affected by the heat and mass fluxes.
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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
Pressure Drop and Two Phase Flow During Boiling of FC-72 in a High Aspect Ratio Micro-Channel
Yuan Wang,
Yuan Wang
University of Edinburgh, Edinburgh, UK
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Khellil Sefiane,
Khellil Sefiane
University of Edinburgh, Edinburgh, UK
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Rachid Bennacer
Rachid Bennacer
University of Cergy Pontoise, Cergy Pontoise, France
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Yuan Wang
University of Edinburgh, Edinburgh, UK
Khellil Sefiane
University of Edinburgh, Edinburgh, UK
Rachid Bennacer
University of Cergy Pontoise, Cergy Pontoise, France
Paper No:
IHTC14-23336, pp. 727-734; 8 pages
Published Online:
March 1, 2011
Citation
Wang, Y, Sefiane, K, & Bennacer, R. "Pressure Drop and Two Phase Flow During Boiling of FC-72 in a High Aspect Ratio Micro-Channel." 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. 727-734. ASME. https://doi.org/10.1115/IHTC14-23336
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