Effect of interfacial shear on gas absorption into a turbulent falling film with co-current gas flow

Abstract

Experimental measurements of the liquid side mass transfer coefficient are reported for CO 2 absorption into a turbulent falling water film at 25°C with co-current gas flow. The liquid film Reynolds number was in the range 1830 to 8030. As the gas velocity was increased from 0 to 14 m/s there was a more than four fold increase in the mass transfer coefficient. The data is well correlated by ( K L K o L ) = 1+2.3( τ i τ o w ) . Data for the skin friction coefficient are also reported, showing a large increase above the dry wall value for high liquid and gas phase Reynolds numbers.