Abstract
A numerical simulation is carried out to investigate the high Schmidt number mass transfer in liquid phase during the head-on collision of binary droplets. Under stagnant gas containing an absorbed gas species, binary droplets collide head-on and then coalesce followed by deformation. The effect of the initial concentration of the gas species on the gas absorption rate is discussed. The fluid flow from inside to the surface thins the concentration boundary thickness, resulting in an increase in the absorption rate. The concentration gradient near the surface becomes steep by the fluid flow and then the gas absorption is enhanced remarkably when the concentration is initially high near the surface.
