Confined Bubble and Heat Transfer during Flow Boiling in a High Aspect Ratio Mini-Channel

Abstract:

Single vapour bubble growth and heat transfer mechanism during flow boiling in a rectangular horizontal mini-channel were experimentally investigated. The hydraulic diameter of the channel was 1454 μm, with an aspect ratio (Win/din) of 10. Degassed FC-72 was used as the working liquid. In this paper, bubble equivalent radius was found to increase linearly till a critical time, beyond which the growth turned into exponential. Bubble growth rate increases with increasing heat flux. Heat transfer mechanisms of the bubble growth at different heat fluxes and mass fluxes were discussed. In addition, the relation between thermal and flow conditions with bubble temporal geometry was explored.

• Periodical: Defect and Diffusion Forum (Volumes 312-315)
• Pages: 548-553
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.312-315.548
• Online since: April 2011
• Authors: Yuan Wang, Khellil Sefiane
• Keywords: Bubble Dynamics, Confinement, Flow Boiling, Heat Transfer

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