Two-Phase Flow Through Square and Circular Microchannels—Effects of Channel Geometry

[+] Author and Article Information
Peter M.-Y. Chung, Masahiro Kawaji

Dept. of Chemical Engineering & Applied Chemistry, University of Toronto, Toronto, Ontario, Canada

Akimaro Kawahara

Dept. of Mechanical Engineering & Materials Science, Kumamoto University, Kumamoto, Kyushu, Japan

Yuichi Shibata

Dept. of Mechanical Engineering, Ibaraki National College of Technology, Hitachinaka-shi, Ibaraki-ken, Japan

J. Fluids Eng 126(4), 546-552 (Sep 10, 2004) (7 pages) doi:10.1115/1.1777227 History: Received May 27, 2003; Revised March 17, 2004; Online September 10, 2004
Copyright © 2004 by ASME
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Experimental apparatus and test section
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Flow patterns in the square and circular microchannels under similar flow conditions
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Two-phase flow pattern maps using flow pattern definitions for microchannels (□ slug-ring; ○ ring-slug; ▿ multiple; ⋄ semi-annular; —— transition lines)
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Volume-averaged void fraction (○ from experiment; —— from Eq. (3) with C1=0.03, C2=0.97; ⋅ ⋅ ⋅ ⋅ ⋅ for homogeneous flow; - - - - - from Ali et al. 16)
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Prediction of the two-phase frictional pressure gradient in the (a) 96 μm square channel and (b) 100 μm circular channel. The C-value in the Lockhart-Martinelli correlation (Eq. 4) is averaged from experiment.




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