Fall Velocity of Rigid Sphere in Asymmetrically Oscillating Fluid
Chang, Tsang-Jung
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https://hdl.handle.net/2142/83432
Description
Title
Fall Velocity of Rigid Sphere in Asymmetrically Oscillating Fluid
Author(s)
Chang, Tsang-Jung
Issue Date
1997
Doctoral Committee Chair(s)
Ben Chie Yen
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
Suspended sediment, occurring generally in the earth's water and air environment, is important to land-form development and water and air pollution control. A basic question on sediment suspension in nature fluid body is why the sediment particles do not settle down even though they are heavier than the surrounding fluid. Among the different plausible suggestions, one possible explanation is that flow oscillation provides a mechanism to keep the sediment particle in suspension. An analytic-numeric study has been carried out to investigate the settling behavior of a rigid homogeneous sphere in a vertically oscillating fluid, particularly to identify the oscillation-induced levitation condition at which a particle responds to the vertically oscillating fluid so that the net gravity force is completely neutralized and the particle merely oscillates about a fixed level. Applicability of the analytic-numeric study is tested by using experimental data obtained in the present research as well as by other previous researches.
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