Abstract
CO2 absorption into [Bmim][BF4] aqueous solution was investigated experimentally. To enhance gas-liquid mass transfer, the heart-shaped grooves were engraved in the microchannel. It was found that the grooves could cause eddy flow of liquid phase and accordingly promote turbulent and convective mass transfer. Liquid side volumetric mass transfer coefficient and mass transfer enhancement factor could be remarkably increased, and the enhancement factor could reach up to 2.2. Moreover, the effective mass transfer enhancement efficiency was analyzed considering the energy consumption, and its value could reach 2.1. A correlation was proposed to predict the liquid side volumetric mass transfer coefficient for the grooved microchannel.
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