The Proceedings of the Fluids engineering conference
Online ISSN : 2424-2896
2019
Session ID : OS3-08
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Motion of a Solid Sphere Launched Vertically Upward toward Water Surface and the Behavior of Air-Water Interface Induced by the Sphere
*Kotaro TAKAMURETomomi UCHIYAMA
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Abstract

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.

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© 2019 The Japan Society of Mechanical Engineers
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