粒子法シミュレーションによるフレーム付き自走油滴の内部対流の考察

抄録

We study the motion control of a self-propelled oil droplet dropped into aqueous solution by using a rigid frame. It is well known that an oil droplet with fatty acid anhydride moves in random directions in aqueous solution. Although we have discovered that the moving direction could be controlled using a rigid boomerang-shaped frame, the mechanism of the autonomous motion in a particular direction is not understood theoretically. Since self-propelled droplets move with the effect of Marangoni convection caused by surface tension difference at the droplet surface, we focus on the directional behavior of the Marangoni convection and verify it using a SPH (Smoothed Particle Hydrodynamics) method, which is a meshfree fluid simulation.