Abstract

Visualized experimental observation on flow patterns during flow boiling of water under single-side heated and fluid-inlet subcooled conditions in a vertical narrow rectangular channel with the cross section of 40×3 mm2 have been carried out. Four discernible flow patterns, which names dispersed bubbly, coalesced bubbly, churn flow, and annular flow are observed. Flow visualization in two dimensions of two-phase flow patterns for narrow rectangular channel, which provided clearer evidence to distinguish flow patterns, have been performed. Based on the experimental results, a flow pattern map for single-side heated narrow rectangular channel has been developed and then compared with the exiting maps and flow transition criteria.

Issue Section:
Nuclear Power
Keywords:
flow patterns, visualization, narrow rectangular channel, single-side heated, boiling, channel flow, heat transfer, photography, two-phase flow
Topics:
Flow (Dynamics), Water, Two-phase flow, Photography
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 by American Society of Mechanical Engineers
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