Group Title: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings
Title: P2.16 - Numerical Simulation of Bubble Dispersion in a turbulent Couette-Taylor flow
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 Material Information
Title: P2.16 - Numerical Simulation of Bubble Dispersion in a turbulent Couette-Taylor flow Bubbly Flows
Series Title: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings
Physical Description: Conference Papers
Creator: Chouippe, A.
Climent, E.
Legendre, D.
Publisher: International Conference on Multiphase Flow (ICMF)
Publication Date: June 4, 2010
Subject: dispersion
Lagrangian tracking
Taylor Couette flow
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)).
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
Bibliographic ID: UF00102023
Volume ID: VID00484
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: P216-Chouippe-ICMF2010.pdf

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