マイクロチャンネル内スラグ流におけるガス吸収特性
第1報, CO2/水系における実験的研究
2004 年 70 巻 693 号 p. 1285-1292
詳細
2004 年 70 巻 693 号 p. 1285-1292
Gas absorption and pressure drop characteristics of a slug flow in microchannel were experimentally studied with CO2 and water system in expectation of high absorption performance by large specific interface area, toroidal flow in slug and high heat transfer capability of microchannel. Absorption rate was measured by detecting volume change of gas bubble along the channel with photo-interrupters, and then absorption time constant was formulated as a function of inner diameter, bubble velocity, and liquid slug length. Pressure drop was also formulated by fitting experimental data to an equation modeled as a sum of Poiseuille flow part and toroidal flow part. Based on the formulas, high mass transfer performance and compactness of the proposed system was demonstrated by comparison with typical gas absorption systems such as falling liquid film and dispersion bubbles. The microchannel gas absorber, of which channel length was set to keep outlet liquid concentration a specified value, was estimated to be more compact by reducing a channel diameter with a slight increase of pressure drop.
