Heat and Mass Transfer Characteristics of a Falling Film Absorber

A numerical analysis was conducted to explore the concurrent heat and mass transfer occurring in the descent of a liquid film during absorption within an aqueous lithium bromide solution, as it flows downward within a vertical channel. The steady, two-dimensional laminar flow was modeled using the finite volume method to solve the governing equations. The study delves into the influence of operational parameters and reveals that, as the Reynolds number decreases, the absorption mass flux rises. Furthermore, the absorption mass flux increases with higher system pressure, concentration and variable cooling water temperature, as discussed and presented in the results.