A Study of Spherical Bubbles in a Vertical Turbulent Boundary Layer

Liquid forces acting on individual bubbles in this turbulent boundary layer were also explored. This task was accomplished by employing a cinematic Particle Image Velocimetry system. Quadruple-pulsed images were obtained in a temporal sequence, such that the instantaneous liquid velocity and bubble trajectories could be accurately determined. Bubble velocity, acceleration, and buoyancy force were obtained from the trajectory data. Analysis of the force results indicate that drag coefficient decreases with increasing Reynolds number, but decreases with increased turbulence intensity. The lift coefficient is much higher than creeping flow or inviscid theory and tends to decrease with increasing bubble Reynolds number.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Felton, Keith Carnel

Contributors dc:contributor

• Loth, Eric

• Engineering, Marine and Ocean

Language dc:language

eng

Identifier

(MiAaPQ)AAI9953012

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/83989