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Experimental and numerical studies on two-dimensional gravity currents in a horizontal channel

Citation

Chan, Wingsiu Richard (1993) Experimental and numerical studies on two-dimensional gravity currents in a horizontal channel. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-08232007-094513

Abstract

The objective of this investigation is to examine the behavior of two-dimensional gravity currents, especially as applied to the spreading of smoke, generated from a room fire, along a long corridor. Both experimental and numerical techniques were used to provide a model that can adequately explain and predict the behavior of a gravity current under certain boundary conditions.

A series of experiments was carried out to study the effects of Reynolds number on gravity currents in a horizontal water channel. Measurements of the time varying front position, velocity profile of the following current, and the depth of a gravity current were made using either dyed liquids or hydrogen bubble technique. Quantitative results were shown to agree with previously published results. A model was put forth to bridge the gap between the existing models for an inertia-buoyancy dominated gravity current and a viscous-buoyancy dominated one. Comparison between the experimental results and numerical results obtained from the model proved that the model can adequately explain the behavior of the phenomenon.

A second series of experiments was conducted to investigate the behavior of gravity currents in an inclined channel. The quantitative results obtained were less scattered than those obtained in previous research. The gravity current was found to be unsteady in a horizontal channel, while a channel with an angle of inclination of one degree was found to produce a steady flow behind the front of the gravity current. The change of the gravity currents from an unsteady to a steady nature due to the change in the inclination of the channel was found to be gradual and much less abrupt than assumed in previous studies.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Mechanical Engineering
Thesis Availability:Restricted to Caltech community only
Research Advisor(s):
  • Zukoski, Edward E.
Thesis Committee:
  • Zukoski, Edward E. (chair)
  • Marble, Frank E.
  • Knowles, James K.
  • Sabersky, Rolf H.
  • Kubota, Toshi
Defense Date:11 November 1992
Record Number:CaltechETD:etd-08232007-094513
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-08232007-094513
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3206
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:27 Aug 2007
Last Modified:26 Dec 2012 02:58

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