Pressure drop of two-phase dry-plug flow in round mini-channels: Effect of moving contact line

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In the present experimental study, the pressure drop of the two-phase dry-plug flow (dry wall condition at the gas portions) in round mini-channels was investigated. The air-water mixtures were flowed through the round mini-channels made of polyurethane and Teflon, respectively, with their inner diameters ranging from 1.62 to 2.16 mm. In the dry-plug flow regime, the pressure drop measured became larger either by increasing the liquid superficial velocity or by decreasing the gas superficial velocity due to the increase of the number of the moving contact lines in the test section. In such a case, the role of the moving contact lines turned out to be significant. Therefore, a pressure drop model of dry-plug flow was proposed through modification of the dynamic contact angle analysis taking account of the energy dissipation by the moving contact lines, which represents the experimental data within the mean deviation of 4%. (C) 2009 Elsevier Inc. All rights reserved.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2010-01
Language
English
Article Type
Article
Keywords

POOR WETTABILITY; SURFACE WETTABILITY; VERTICAL PIPE; TUBES

Citation

EXPERIMENTAL THERMAL AND FLUID SCIENCE, v.34, no.1, pp.1 - 9

ISSN
0894-1777
DOI
10.1016/j.expthermflusci.2009.08.005
URI
http://hdl.handle.net/10203/13150
Appears in Collection
ME-Journal Papers(저널논문)
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