An Experimental Study of Simultaneous Heat and Mass Transfer in Falling Film and Bubble Mode Absorbers

摘要

In this study we investigated the lithium chloride-water vapor absorption process for falling film and bubble column absorbers under the same operating conditions. The results obtained were used to analyze the transfer process during the absorption of water vapor in an aqueous solution of LiCL. The performance of both absorbers was investigated for various solution flow rates and various gas flow rates. The results showed that bubble absorber is superior to the falling film mode for mass and heat transfer. Increasing the solution flow rates rarely affected the mass transfer but improved the heat transfer. As the gas flow rate increased, channels were fowled in the film, which decreased the mass transfer in the falling film. But in the bubble column, increasing the gas flow rate influenced the boundary layer and therefore enhanced mass transfer.