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http://dx.doi.org/10.5916/jkosme.2015.39.7.696

Heat transfer characteristic and flow pattern investigation in micro-channels during two-phase flow boiling  

Choi, Yong-Seok (Division of Marine Engineering, Korea Maritime and Ocean University)
Lim, Tae-Woo (Division of Marine Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.39, no.7, 2015 , pp. 696-701 More about this Journal
Abstract
Two-phase flow boiling experiments were conducted in 15 micro-channels with a depth of 0.2 mm, width of 0.45 mm, and length of 60 mm. FC-72 was used as the working fluid, and the mass fluxes ranged from 200 to $400kg/m^2s$. Tests were performed over a heat flux range of $5-40kW/m^2$ and vapor quality range of 0.1-0.9. The heat transfer coefficient sharply decreased at a lower heat flux and then was kept approximately constant as the heat flux is increased. Based on the measured heat transfer data, the flow pattern was simply classified into bubbly, slug, churn, and wavy/annular flows using the existing method. In addition, these classified results were compared to the transition criterion to wavy/annular regime. However, it was found that the existing transition criterion did not satisfactorily predict the transition criterion to annular regime for the present data.
Keywords
Flow pattern; Heat transfer; Micro channels; Transition criterion; Two-phase flow boiling;
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Times Cited By KSCI : 3  (Citation Analysis)
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