Three-dimensional measurement of gas dissolution process in gas–liquid microchannel flow

The three-dimensional CO2 dissolution process through a gas–liquid interface in microfluidic devices was investigated experimentally, for the precise control of CO2 dissolution. The gas dissolution was evaluated by using confocal micron-resolution particle image velocimetry (micro-PIV) combined with...

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Bibliographic Details
Published in:	International journal of heat and mass transfer Vol. 55; no. 11-12; pp. 2872 - 2878
Main Authors:	Ichiyanagi, Mitsuhisa, Tsutsui, Issei, Kakinuma, Yasuhiro, Sato, Yohei, Hishida, Koichi
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-05-2012 Elsevier
Subjects:	Applied fluid mechanics Carbon dioxide Channels Confocal microscopy Dissolution Exact sciences and technology Fluid dynamics Fluid flow Fluidics Fundamental areas of phenomenology (including applications) Gas–liquid flow Instrumentation for fluid dynamics Laser induced fluorescence Liquid flow Micro-PIV Microchannel Microchannels Multiphase and particle-laden flows Nonhomogeneous flows Physics Three dimensional Micro-PIV Confocal microscopy Gas–liquid flow Microchannel Laser induced fluorescence Gas liquid interface Test facilities Carbon dioxide Optical systems Experimental study Dissolution Two-phase flow Particle image velocimetry Velocity measurement Microstructure Microfluidics Concentration distribution
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Summary:	The three-dimensional CO2 dissolution process through a gas–liquid interface in microfluidic devices was investigated experimentally, for the precise control of CO2 dissolution. The gas dissolution was evaluated by using confocal micron-resolution particle image velocimetry (micro-PIV) combined with laser induced fluorescence (LIF), which has the ability to measure the velocity and dissolved CO2 concentration distribution in a liquid flow field. The measurement system is based on the confocal microscope, which has excellent depth resolution and enables visualization of the three-dimensional distributions of velocity and dissolved CO2 concentration by rendering two-dimensional data. The device is comprised of a polydimethylsiloxane chip, whose microchannels were fabricated by using a cryogenic micromachining system. The width and depth of the liquid flow channel are larger than those of the gas flow channel. This is due to the need for decreasing the width of the gas–liquid interface and increasing the hydraulic diameter of the liquid channel, whose conditions generate a static gas–liquid interface. The experiments were performed for three different liquid flow conditions corresponding to Reynolds numbers of 1.0×10−2, 1.2×10−2 and 1.7×10−2, and the gas flow rate was set to be constant at 150μL/min. The LIF measurements indicate that an increase in the Reynolds number yields a decrease in dissolved gas in the spanwise directions. Furthermore, molar fluxes by convection and diffusion were evaluated from the experimental data. The molar fluxes in the streamwise direction were at least 20 times as large as those in the spanwise and depthwise directions. This reveals that an increase in momentum transport in the spanwise and depthwise directions is an important factor for enhancing mass transfer in the gas–liquid microchannel flow.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0017-9310 1879-2189
DOI:	10.1016/j.ijheatmasstransfer.2012.02.009