Abstract
Real-time laser holographic interferometry was applied to measure liquid concentrations of CO 2 in the vicinity of gas-liquid free interface under the conditions of cocurrent gas-liquid flow for absorption of CO 2 by ethanol. The influences of the Reynolds number on the measurable interface concentration and on the film thickness were discussed. The results show that CO 2 concentration decreases exponentially along the mass transfer direction, and the concentration gradient increases as Reynolds number of either liquid or gas increases. CO 2 concentrations fluctuate slightly along the direction of flow; on the whole, there is an increase in CO 2 concentration. The investigation also demonstrated that film thickness decreases with the increase of Reynolds number of either of the two phases. Sherwood number representing the mass transfer coefficient was finally correlated as a function of the hydrodynamic parameters and the physical properties.
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