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In this paper, measurements of the absorption rate obtained in an adiabatic membrane based microchannel absorber using three different membranes characterized by their pore diameter, thickness and porosity are presented. The mass transfer resistance is mainly due to the resistance in the solution bulk that represents 85% of the overall mass transfer resistance. The influence of the driving force, that is, the pressure potential is also shown. When the pore size is reduced by 45%, the absorption rate is reduced accordingly. To obtain a similar absorption rate the pressure potential must augment in 1kPa to compensate for this reduction in pore size. Thickness of the membrane has a similar influence, confirming previous simulated results.

Experimental measurement of mass transfer resistances in a membrane based adiabatic microchannel absorber