NDLI: Liquid and Gas Phase Velocity Measurements for Two Phase Flow in a Branching Microchannel Network

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Kwak, Younghoon Pence, Deborah Liburdy, James Narayanan, Vinod
Copyright Year	2007
Abstract	This is a work in progress. The objective of the present work is to develop techniques for assessing velocity deficits in branching microchannel networks. Liquid velocity distributions were acquired using μPIV in gas-liquid flows through the initial branch in a fractal-like branching microchannel flow network. Gas interface velocities were determined along the centerline of the channel. The flow rate of air and water were 0.0016 g/min and 20 g/min, respectively. The primary observed flow regime was elongated bubbles. Experimental liquid velocities well matched the 0.20 m/s superficial liquid velocity. Experimental interface velocities were approximately an order of magnitude higher than the superficial gas velocity of 0.01 m/s. Velocity deficits based on measurements are on the order of 0.065 m/s. Using interfacial velocities at the channel centerline, the trailing edge velocity was observed to be 15% percent faster, on average, than the leading edge velocity. This could be attributed to bubbles expanding into the bifurcation. Twenty percent standard deviations in average interface velocities were attributed to insufficient samples as well as projected to be a consequence of changing shape of the interface between consecutive image pairs. Changes in bubble shape may also be responsible for the observed differences between leading and trailing edge velocities.
Starting Page	791
Ending Page	800
Page Count	10
File Format	PDF
ISBN	079184305X
DOI	10.1115/IMECE2007-41621
e-ISBN	0791838129
Volume Number	Volume 11: Micro and Nano Systems, Parts A and B
Conference Proceedings	ASME 2007 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2007-11-11
Publisher Place	Seattle, Washington, USA
Access Restriction	Subscribed
Subject Keyword	Water Bubbles Two-phase flow Bifurcation Fractals Microchannel flow Shapes Velocity measurement Flow (dynamics) Microchannels
Content Type	Text
Resource Type	Article

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