The study involves lithium-Chloride absorption process for the falling film and bubble columns absorbers, working at the same operating conditions. The results obtained were used to analyze the transfer process during the absorption of water vapor in the aqueous solution of LiCl. The performance of both absorbers was investigated for various solution flow rates (0.1-0.5)kg/min , various gas flow rates (1-9) lit/min and inlet solution concentration (40-50) wt%. Results showed that bubble

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... is superior to the falling film mode for mass and heat transfer and that the efficiency of bubble columns is more than that of falling film absorbers. Increasing the solution flow rates rarely affected the mass transfer, but improved the heat transfer. To evaluate the performance of mass and heat transfer, experimental results obtained were plotted as Nusselt and Sherwood number versus operating conditions respectively for falling film and bubble modes. A power law correlations were obtained for the objective functions (i.e., mass and heat transfer coefficients) with correlation coefficient between (0.91 and 0.97) .