Title page for ETD etd-01172009-063113


Type of Document Master's Thesis
Author Hunt, William E.
URN etd-01172009-063113
Title Breakup and coalescence in turbulent two-phase flows
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Kornhauser, Alan A. Committee Chair
Davis, Richey M. Committee Member
Vandsburger, Uri Committee Member
Keywords
  • turbulent flow
Date of Defense 1995-07-05
Availability restricted
Abstract
Many engineering processes involve a gas and a liquid or two immiscible liquids in turbulent flow. The turbulent flows present in two-phase systems will cause the bubbles or drops of a dispersion to undergo breakup and coalescence, and the resulting changes in the dispersion may significantly affect the engineering process under consideration. For this reason, many researchers have studied breakup and coalescence in turbulent two phase flows. Models that can be used to simulate changes in a dispersion over time have been proposed, but these models contain constants that change with experimental conditions and empirical equations that can only be considered valid for certain experimental setups. The goal of this study was to develop general models that could be used to predict changes in bubble or drop size distributions over time for turbulent flows in agitated vessels and pipes.

Computer programs were written to reproduce the results of three agitated vessel studies. These programs used existing population balance models to approximate the changes in a dispersion over time measured in previous experiments. A new model for breakup in agitated vessels was then developed and verified with existing experimental data. A new model for coalescence in agitated vessels was also developed and verified with existing experimental data. Both of these models are based on theory and are more readily extendible than previous breakup and coalescence models. The work for agitated vessels was then extended to turbulent two-phase pipe flow. Since there was only a limited amount of experimental data available for breakup and coalescence in pipes, the model for turbulent pipe flow could not be verified.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
[VT] LD5655.V855_1995.H8345.pdf 6.35 Mb 00:29:23 00:15:07 00:13:13 00:06:36 00:00:33
[BTD] next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.