Effects of gas concentration on hydrodynamics of gas absorption in a microchannel

Abstract

AbstractIn this article, the effects of gas concentration on hydrodynamics of gas–liquid two‐phase flow with mass transfer during gas absorption in a microchannel are investigated, by using 2‐amino‐2‐methyl‐1‐propanol (AMP) solution to absorb mixtures of CO2 and N2 with various volume fractions. The concentration of CO2 not only affects the driving force of gas–liquid mass transfer, but also affects the pressure drop of gas–liquid two‐phase flow. The average linear velocity of the liquid phase is estimated by introducing the void fraction, which accurately characterizes the difference in the bubble velocity versus the liquid velocity. On this basis, the pressure drop model of gas–liquid two‐phase flow with mass transfer in a microchannel is established. Through the pressure drop model, the influence mechanism of CO2 concentration on the pressure drop during gas absorption in a microchannel is revealed.