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| Full Citation |
| Material Information |
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Title: |
P2.16 - Numerical Simulation of Bubble Dispersion in a turbulent Couette-Taylor flow Bubbly Flows |
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Series Title: |
7th International Conference on Multiphase Flow - ICMF 2010 Proceedings |
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Physical Description: |
Conference Papers |
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Creator: |
Chouippe, A.
Climent, E.
Legendre, D. |
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Publisher: |
International Conference on Multiphase Flow (ICMF) |
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Publication Date: |
June 4, 2010 |
| Subjects |
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Subject: |
dispersion
Lagrangian tracking
Taylor Couette flow |
| Notes |
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Abstract: |
We consider bubble dispersion in a turbulent Taylor Couette flow. The aim of this study is to describe the main
mechanisms responsible for the preferential bubble accumulation that have experimentally been observed. We first
proceed to direct numerical simulation (DNS) of Taylor Couette flow for two different geometrical configurations and
Reynolds numbers corresponding to the turbulent regime (Re = 4000 8000). The structure of the flow is described
using two different averaging procedures that permit to characterise the mean azimuthal velocity, the Taylor vortices
contribution and the turbulent fluctuations. The simulations are compared to results obtained in previous DNS. The
second part of this study is devoted to bubble dispersion. The mechanisms of dispersion are analysed by comparing
the dispersion given by the DNS of the fully turbulent flow with bubble dispersion obtained using the mean flow
field (Taylor vortices superposed to the azimuthal Couette flow). Several patterns of preferential accumulation of
bubbles have been observed. Bubble attraction within the vortices is still occuring for narrow gap while bubbles are
accumulating along the inner wall for the large gap configuration. Varying the intensity of buoyancy yield to complex
evolution of the bubble distribution. For low gravity effects, bubble entrapment is strong and two well identified
bubble collars per wavelength are observed. Increasing buoyancy leads to displacement of accumulation zones and
eventually bubbles escape from one vortex leading to accumulation along the inner wall close to outflow regions.
Finally, when buoyancy dominates vortex trapping disappear and the formation of spirals stretched along the inner
cylinder occurs ( Murai et al. (2005)). |
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General Note: |
The International Conference on Multiphase Flow (ICMF) first was held in Tsukuba, Japan in 1991 and the second ICMF took place in Kyoto, Japan in 1995. During this conference, it was decided to establish an International Governing Board which oversees the major aspects of the conference and makes decisions about future conference locations. Due to the great importance of the field, it was furthermore decided to hold the conference every three years successively in Asia including Australia, Europe including Africa, Russia and the Near East and America. Hence, ICMF 1998 was held in Lyon, France, ICMF 2001 in New Orleans, USA, ICMF 2004 in Yokohama, Japan, and ICMF 2007 in Leipzig, Germany. ICMF-2010 is devoted to all aspects of Multiphase Flow. Researchers from all over the world gathered in order to introduce their recent advances in the field and thereby promote the exchange of new ideas, results and techniques. The conference is a key event in Multiphase Flow and supports the advancement of science in this very important field. The major research topics relevant for the conference are as follows: Bio-Fluid Dynamics; Boiling; Bubbly Flows; Cavitation; Colloidal and Suspension Dynamics; Collision, Agglomeration and Breakup; Computational Techniques for Multiphase Flows; Droplet Flows; Environmental and Geophysical Flows; Experimental Methods for Multiphase Flows; Fluidized and Circulating Fluidized Beds; Fluid Structure Interactions; Granular Media; Industrial Applications; Instabilities; Interfacial Flows; Micro and Nano-Scale Multiphase Flows; Microgravity in Two-Phase Flow; Multiphase Flows with Heat and Mass Transfer; Non-Newtonian Multiphase Flows; Particle-Laden Flows; Particle, Bubble and Drop Dynamics; Reactive Multiphase Flows |
| Record Information |
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Bibliographic ID: |
UF00102023 |
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Volume ID: |
VID00484 |
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Source Institution: |
University of Florida |
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Holding Location: |
University of Florida |
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Rights Management: |
All rights reserved by the source institution and holding location. |
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Resource Identifier: |
P216-Chouippe-ICMF2010.pdf |
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