Affiliations: Graduate School of Engineering, Toyo University, 2100
Kujirai, Kawagoe, Saitama 350-8585, Japan. E-mail: dn0800032@toyonet.toyo.ac.jp | Faculty of Science and Engineering, Toyo University,
2100 Kujirai, Kawagoe, Saitama 350-8585, Japan
Abstract: Splashes caused by a spherical body plunging into water were
investigated experimentally using a high speed CMOS camera. We categorized
types of splash according to impact velocities of the sphere. Three types of
splash were found: Type-I is a thin spire-type splash, Type-II is a
mushroom-type splash with many droplets, and Type-III is a crown-type splash
with many droplets. The reaction to the concave water surface attached to the
sinking sphere is a cause of the Type-I splash. The film flow climbing up the
sphere is a dominant cause of the Type-II splash. The velocity of the film
flow, which is proportional to the impact velocity of the sphere, affects the
fingers of the film flow, detaching of droplets, and maximum height of the
Type-II splash. The Type-III crown-type splash is characterized by water jets
with many droplets. A bulky air column in water is formed behind the sinking
sphere, and longitudinal ridges and ripples on the surface of the air column
were observed.
Keywords: Visualization, Water splash, Solid sphere, Film flow, High speed CMOS video camera
