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Proceedings of Symposium on Energy Engineering in the 21st Century (SEE2000) Volume I-IV

ISBN Print: 1-56700-132-7

TWO-PHASE FLOW PATTERNS IN AN ULTRA-SMALL-SCALE FLOWING PASSAGE

Abstract

The air-water two-phase flow patterns are visualized in a 25µm ultra-small flowing passage through a microscope. The superficial velocities of both two phases are covering a broad range of JL=0.003-17.52m/s and JG=0.0012-295.3m/s. Four distinctive flow patterns, namely, dispersed bubbly flow, gas slug flow, liquid ring flow and liquid lump flow, are observed and their special features are described. Among the four flow patterns, the liquid ring flow is a newly observed one that is characterized with a series of symmetrically distributed liquid rings surrounding the gas core.
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