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TECHNICAL PAPERS

Modeling and Qualitative Experiments on Swirling Bubbly Flows: Single Bubble With Rossby Number of Order 1

[+] Author and Article Information
F. Magaud, A. F. Najafi, J. R. Angilella, M. Souhar

Laboratoire d’Energétique et de Mécanique Théorique et Appliquée, LEMTA, CNRS-UMR 7563 ENSEM-INPL, 2, avenue de la Fore⁁t de Haye, B.P. 160, 54504 Vandoeuvre Cedex, France

J. Fluids Eng. 125(2), 239-246 (Mar 27, 2003) (8 pages) doi:10.1115/1.1539870 History: Received July 25, 2001; Revised October 21, 2002; Online March 27, 2003
Copyright © 2003 by ASME
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Figures

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Sketch of the pipe flow and of the rotating honeycomb. The inner radius of the pipe is R=0.03 m. The liquid/gas mixture flows through the honeycomb. Alternatively, the gaseous phase can also be injected by means of a needle.
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Photographs showing the device at work, for two different rotation rates. The honeycomb is located on the right-hand side of the photographs. In case (a) a liquid/gas mixture flows through the honeycomb. In case (b) a train of bubbles is introduced by means of the needle. The tip of the needle is locate outside the visualization frame. The effect of swirling is clearly visible here, as it makes the light phase converge to the vicinity of the pipe axis.
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Mean velocity profiles at sections z/R=2.4 and z/R=12 obtained from experiments and numerical computation (CFD code Fluent with Reynolds stresses (RSM) turbulence model). The Rossby number is Ro=0.59. In the vicinity of the center the velocity is close to a solid body rotation. The Rossby number in the four cases considered in the present paper will be larger than this one, and the corresponding velocity profiles will therefore be approximated by a solid-body rotation.
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Plot of the computed particle Reynolds number, for the four runs
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Plot of the decay of the r-coordinate in the four cases considered in this paper, obtained from the numerical computation. As predicted by the analysis, the oscillating regime appears when N is larger than about 200 rpm.
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Plot of the analytical solution (1617) of the nonlinear drag analysis (solid line), together with the full numerical solution (symbol ○) of the basic equations of motion (678) when N=104 rpm
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Comparison between experimental trajectories (solid lines) and computed trajectories (dashed lines)
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Evolution of the forces acting on the particle, for the run N=209 rpm

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