NDLI: Visualization Study on Gas Bubble Break-Up and Transport Phenomena in Microchannels

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Yim, Dongwook Sung, Jaeyong Yoo, Jung Yul
Copyright Year	2011
Abstract	In the present research, a visualization study is carried out to understand the flow patterns and break-up formation in flow-focusing microfludic device, which usually involve gas-liquid two-phase flow patterns such as bubbly flow, slug flow, and annular flow. High-speed camera and fluorescence microscopy are used to the characterize microscale gas-liquid two-phase flows in 191.64 μm × 200 μm rectangular PDMS microchannel which are fabricated by using soft lithography technique. N2 and Silicone oil serve as the gas and liquid phases, respectively. The influence of gas and liquid flow rates and the viscosity of the liquid phase on the bubble size, flow patterns, and generating frequency are experimental studied. This study is focused on viscosity of liquid phase. In order to influence of viscosity of liquid phase, various viscosity silicone oils are used in this study. The breakup mechanism, bubble generating rate, and gas bubble making time are investigated at the cross junction. The gas bubble size and space of between bubbles are dependent on the flow rates of the liquid and gas, and viscosity of liquids. The slug length L is also dependent on the flow rates of the liquid and gas in such a manner that the ratio of slug length to the channel width is a function of the flow rate ratio of gas to liquid.
Sponsorship	Fluids Engineering Division
Starting Page	2631
Ending Page	2636
Page Count	6
File Format	PDF
ISBN	9780791844403
DOI	10.1115/AJK2011-10044
Volume Number	ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D
Conference Proceedings	ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
Language	English
Publisher Date	2011-07-24
Publisher Place	Hamamatsu, Japan
Access Restriction	Subscribed
Subject Keyword	Viscosity Visualization Transport phenomena Oils Lithography Microscale devices Plasma desorption mass spectrometry Fluorescence Flow (dynamics) Petroleum Microchannels Bubbles Bubbly flow Microscopy Slug flows Two-phase flow Silicones Junctions
Content Type	Text
Resource Type	Article

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