Fall Velocity of Rigid Sphere in Asymmetrically Oscillating Fluid

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Civil Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Chang, Tsang-Jung

Contributors dc:contributor

• Ben Chie Yen

• Engineering, Civil

Language dc:language

eng

Identifier

(MiAaPQ)AAI9737069

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/83432