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 absorber 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) .