AM05-24-003 単純せん断流中の気泡に働く揚力に対する界面活性剤の吸着・脱離の影響(混相流・機能性流体1,一般講演)

概要

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In this paper, the bubble motion in surfactant solution is calculated with using the boundary-fitted grid and the force acting on a spherical bubble is solved directly. In our calculation, the surfactant ad/desorption is considered by Langmuir kinetics which is the non-linear boundary condition. It is well-known that the adsorption of surfactant to the bubble surface decreases the surface tension and changes the boundary condition on surface. It is expected that this change of the boundary condition affects the shear-induced lift force acting on a bubble. We calculated the lift force acting on the stagnant cap bubble and showed the dependency of the lift force on the cap angle. From our results, the pressure contribution to the lift force is found to be important and we discuss the pressure and surface velocity distribution on the stagnant cap bubble surface.
日本流体力学会の論文
2005-09-05