Experimental study of interfacial mass transfer in a slug flow of ethanol-CO2 mixture in a rectangular microchannel
G.V. Bartkus1, N.A. Filatov2, A.S. Bukatin2,3, V.V. Kuznetsov1
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Alferov Saint Petersburg Academic University of RAS, St. Petersburg, Russia
3Institute for Analytical Instrumentation of RAS, St. Petersburg, Russia
Keywords: rectangular microchannel, gas-liquid flow, interfacial mass transfer, CO dissolution
Abstract
The structure of a slug gas-liquid flow and interfacial mass transfer during the flow of ethanol-N2 and ethanol-CO2 mixtures in a horizontal rectangular microchannel have been experimentally studied. The experiments were carried out in a straight microchannel with a cross-section of 380×190 µm. To determine a change in the volume of a gas slug along the microchannel length, the method of high-speed visualization with digital processing was applied. In a wide range of gas flow rates, the repetition rate and the volume of gas slugs and their velocity were measured, and he volumetric coefficient of mass transfer from liquid was determined for the ethanol-CO2 mixture. A physically substantiated model of interfacial mass transfer for a slug flow in a channel of rectangular cross-section, which takes into account the circulation flow in a liquid bridge, is proposed.
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