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Physics of Fluids / Volume 22 / Issue 4 / ARTICLES / Instability and Transition

Phys. Fluids 22, 044103 (2010); http://dx.doi.org/10.1063/1.3407665 (10 pages)

On the quasiperiodic state in a moderate aspect ratio Taylor–Couette flow

E. Imomoh, J. Dusting, and S. Balabani

Experimental and Computational Laboratory for the Analysis of Turbulence (ECLAT), Division of Engineering, King’s College London, Strand WC2R 2LS, United Kingdom

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(Received 30 April 2009; accepted 3 March 2010; published online 29 April 2010)

The transition pathway leading to chaotic flow in a Taylor–Couette vessel of aspect ratio γ = 11.2 and radius ratio η = 0.81 with only the inner cylinder rotating has been studied using time-resolved particle image velocimetry. A hitherto unreported sequence of transitions, whereby the flow changes from wavy vortex flow to a quasiperiodic state of high modulation frequency, is identified using spatially resolved spectral analysis. The nature of the modulated wavy vortex flow is detailed using proper orthogonal decomposition, through which it is revealed that the modulation is similar to a fast moving azimuthal wave (FMAW). In contrast with previous observations of the FMAW at a much higher aspect ratio, the mode appears directly after wavy vortex flow and as a precursor to the CVF regime. The FMAW is also associated with codirectional vorticity fluctuations on each Taylor vortex core that diminish in strength close to the endwalls.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. METHODOLOGY
  3. RESULTS AND DISCUSSION
    1. Identification of flow regimes
    2. Temporal characteristics of the quasiperiodic regime
    3. Structures identified by POD
  4. CONCLUSION

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KEYWORDS and PACS

Keywords

chaos, Couette flow, flow visualisation, vortices, waves

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3407665

PUBLICATION DATA

ISSN

1070-6631 (print)  
1089-7666 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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