Experimental analysis of the unit cell approach for two-phase flow dynamics in curved flow channels

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DOIResolve DOI: http://doi.org/10.1016/j.ijheatmasstransfer.2007.05.020
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TypeArticle
Journal titleInternational Journal of Heat and Mass Transfer
Volume51
Issue5-6
Pages10951103; # of pages: 9
SubjectMini-channel; Curved channel; Gas-liquid two phase flow; Flow mapping; Mixing
AbstractFlow behavior of gas舑liquid mixtures in thin channels has become increasingly important as a result of miniaturization of fluid and thermal systems. The present empirical study investigates the use of the unit cell or periodic boundary approach commonly used in twophase flows. This work examines the flow patterns formed in small tube diameter (<3 mm) and curved geometry flow systems for air舑water mixtures at standard conditions. Liquid and gas superficial velocities were varied from 0.1 to 7.0 (approx. ±0.01) m/s and 0.03 to 14 (approx. ±0.2) m/s for air and water respectively to determine the flow pattern formed in three geometries and dispersed bubble, plug, slug and annular flow patterns are reported using high-frame rate videography. Flow patterns formed were plotted on the generalized two-phase flow pattern map to interpret the effect of channel size and curvature on the flow regime boundaries. Relative to a straight a channel, it is shown that a 舖C shaped舗 channel that causes a directional change in the flow induces chaotic advection and increases phase interaction to enhance gas bubble or liquid slug break-up thus altering the boundaries between the dispersed bubble and plug/slug flow regimes as well as between the annular and plug/slug flow regimes.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Chemical Process and Environmental Technology
Peer reviewedNo
NRC number49117
NPARC number8925697
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Record identifier613e7a87-4a8a-483c-b76f-17ed813fb939
Record created2009-04-23
Record modified2016-05-09
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