Abstract
Larege-scale molecular dynamics simulations were carried out in order to investigate the effects of surface adsorption on bubble dynamics. We observed a single vapor bubble rising with constant velocity under strong external field in liquid, which consists of 200,000 Lennard-Jones particles. In pure liquid, the flow around the bubble has non-zero velocity on the bubble surface, which is consistent with the slip boundary condition assumed in continuum fluid mechanics. When sufficient amount of model surfactants are adsorbed on the surface, the rising speed drastically decreases, and the flow velocity becomes almost zero on the bubble surface. The adsorbed surfactants are transported on the bubble surface and pile up on the rear end of the bubble.
