Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 07, 2019 - November 08, 2019
To investigate the variation in a sphere's motion and the behavior of the air-water interface induced by the sphere, a solid sphere is launched vertically upward in water toward the air-water interface. Four spheres with different densities ρp were studied: a stainless steel sphere (ρp = 7930 kg/m3), an alumina sphere (ρp = 3900 kg/m3), a Teflon sphere (ρp = 2180 kg/m3), and a Duracon sphere (ρp = 1360 kg/m3). By experimentally visualizing the sphere motion in water, their launch velocity can be set with high accuracy. When a sphere passes through the air--water interface, it makes the interface more complex and entrains water. Additionally, spheres with a small value of ρp were demonstrated to not always vertically collide with the air--water interface.