Abstract
We investigated splash produced by spherical object plunging to water surface. We focused on the effect of swelling of object. We compared the splash versus of swelling of gel object surface. The splash form we observed was crown-type that is formed by water jets with many droplets. The height of splash became higher as swelling increased, arid the speed of gel object sinking down in the water also became higher. The gel surface of object was effective for the reduction of friction of an object moving in liquid.
