LIQUID-SOLID MASS-TRANSFER FROM A WALL IN CONTACT WITH A GAS LIQUID INTERFACE UNDERGOING WAVE MOTION/

Experimental data are presented for mass transfer from a discrete area on a vertical wall near an air/water interface undergoing wave motion . The local mass transfer rate near the interface was found to be well correlated by Sh = (Re0Sc1/3)-Sc-0.5, which is much higher than that for a steady unidirectional flow over a flat plate with the same mean velocity considering the contact time between the wall and the liquid. Visualization studies showed that the high local mass transfer rate w as related to the periodic renewal of the boundary layer near the wall and the extremely high initial mass transfer rate during the establis hment of a new concentration field.