A25-125 GAS ABSORPTION OF SLUG FLOW IN MICROCHANNEL

概要

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Gas absorption and pressure drop characteristics of a slug flow in a microchannel were studied experimentally with a CO_2 and water system. The slug flow provides advantages of a large specific interface area, a toroidal flow in the slug, and high heat transfer capability of the microchannel. The absorption rate was measured by optically detecting volume change of bubbles along the channel; then an absorption time constant was formulated as a function of inner diameter, bubble velocity, and slug length. The pressure drop was also formulated by fitting experimental data to an equation modeled as a sum of the Poiseuille flow part and the toroidal flow part. The formulas demonstrated high mass transfer performance and compactness of the proposed system. Simulation of the microchannel gas absorber, of which channel length was set to keep outlet liquid concentration at a specified value, showed high performance by reducing the channel diameter with a slight increase of pressure drop.
一般社団法人日本機械学会の論文
2003-11-30