An experimental study on vortex breakdown in a differentially-rotating cylindrical container

An experimental study on vortex breakdown in a differentially-rotating cylindrical container The vortex breakdown phenomenon in a closed cylindrical container with a rotating endwall disk was reproduced. Visualizations were performed to capture the prominent flow characteristics. The locations of the stagnation points of breakdown bubbles and the attendant global flow features were in excellent agreement with the preceding observations. Experiments were also carried out in a differentially-rotating cylindrical container in which the top endwall rotates at a relatively high angular velocity Ω t, and the bottom endwall and the sidewall rotate at a low angular velocity Ω sb. For a fixed cylinder aspect ratio, and for a given relative rotational Reynolds number based on the angular velocity difference Ω t–Ω sb, the flow behavior is examined as |Ω sb /Ω t| increases. For a co-rotation (Ω sb /Ω t>0), the breakdown bubble is located closer to the bottom endwall disk. However, for a counter-rotation (Ω sb /Ω t<0), the bubble is seen closer to the top endwall disk. For sufficiently large values of Ω sb, the bubble ceases to exist for both cases. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

An experimental study on vortex breakdown in a differentially-rotating cylindrical container

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Publisher
Springer-Verlag
Copyright
Copyright © 2004 by Springer-Verlag
Subject
Engineering
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-003-0715-9
Publisher site
See Article on Publisher Site

Abstract

The vortex breakdown phenomenon in a closed cylindrical container with a rotating endwall disk was reproduced. Visualizations were performed to capture the prominent flow characteristics. The locations of the stagnation points of breakdown bubbles and the attendant global flow features were in excellent agreement with the preceding observations. Experiments were also carried out in a differentially-rotating cylindrical container in which the top endwall rotates at a relatively high angular velocity Ω t, and the bottom endwall and the sidewall rotate at a low angular velocity Ω sb. For a fixed cylinder aspect ratio, and for a given relative rotational Reynolds number based on the angular velocity difference Ω t–Ω sb, the flow behavior is examined as |Ω sb /Ω t| increases. For a co-rotation (Ω sb /Ω t>0), the breakdown bubble is located closer to the bottom endwall disk. However, for a counter-rotation (Ω sb /Ω t<0), the bubble is seen closer to the top endwall disk. For sufficiently large values of Ω sb, the bubble ceases to exist for both cases.

Journal

Experiments in FluidsSpringer Journals

Published: Feb 13, 2004

References

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