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Physics of Fluids / Volume 24 / Issue 1 / LETTERS

Phys. Fluids 24, 011701 (2012); http://dx.doi.org/10.1063/1.3675551 (7 pages)

The onset of oblique vortex shedding behind a heated circular cylinder in laminar wake regime

Ming-Hsun Wu1, Zdenăk Trávníček2, and An-Bang Wang3

1Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan
2Institute of Thermomechanics, v.v.i., Academy of Sciences of the Czech Republic, Prague, Czech Republic
3Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan

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(Received 5 August 2011; accepted 15 December 2011; published online 5 January 2012)

Oblique vortex shedding (OVS) behind a heated circular cylinder in air was experimentally investigated. Similar to that in the parallel vortex shedding (PVS), the results show that the non-dimensionalized shedding frequency, Strouhal number, decreases under the influence of cylinder heating for oblique shedding mode. Although the onset Reynolds number of OVS increases with the cylinder temperature, the onset effective Reynolds number remains 63.3 ± 1.3 regardless of the cylinder heating. A general Strouhal-Reynolds-number relationship for OVS has been found based on the effective temperature concept in the present study. The ratio of the critical Reynolds numbers for the onsets of OVS and PVS is found to be an invariant with value of 4/3 for both isothermal and non-isothermal cases despite different length/diameter ratios and end conditions.

© 2012 American Institute of Physics

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KEYWORDS and PACS

Keywords

heat transfer, laminar flow, vortices, wakes

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3675551

PUBLICATION DATA

ISSN

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

Publisher

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

For access to fully linked references, you need to log in.
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    H. Eisenlohr and H. Eckelmann, “Vortex splitting and its consequences in the vortex street wake of cylinders at low Reynolds number,” Phys. Fluids A 1(2), 189 (1989)PFADEB000001000002000189000001.

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    M. König, H. Eisenlohr, and H. Eckelmann, “The fine structure in the Strouhal–Reynolds number relationship of the laminar wake of a circular cylinder,” Phys. Fluids A 2(9), 1607 (1990)PFADEB000002000009001607000001.

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