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Temporal stability of Jeffery–Hamel flow

Published online by Cambridge University Press:  26 April 2006

Mahmoud Hamadiche ,
Julian Scott  and
Denis Jeandel
Mahmoud Hamadiche
Affiliation:
Laboratoire de Mécanique des Fluides et d’Acoustique, Ecole Centrale de Lyon, 36, avenue Guy-de-Collongue, BP 163, 69131 Ecully, France
Julian Scott
Affiliation:
Laboratoire de Mécanique des Fluides et d’Acoustique, Ecole Centrale de Lyon, 36, avenue Guy-de-Collongue, BP 163, 69131 Ecully, France
Denis Jeandel
Affiliation:
Laboratoire de Mécanique des Fluides et d’Acoustique, Ecole Centrale de Lyon, 36, avenue Guy-de-Collongue, BP 163, 69131 Ecully, France
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Abstract

In this study of the temporal stability of Jeffery–Hamel flow, the critical Reynolds number based on the volume flux, Rc, and that based on the axial velocity, Rec, are computed. It is found that both critical Reynolds numbers decrease very rapidly when the half-angle of the channel, α, increases, such that the quantity αRc remains very nearly constant and αRecis a nearly linear function of α. For a short channel there can be more than one value of the critical Reynolds number. A fully nonlinear analysis, for Re close to the critical value, indicates that the loss of stability is supercritical. The resulting asymmetric oscillatory solutions show staggered arrays of vortices positioned along the channel.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 268 , 10 June 1994 , pp. 71 - 88
Copyright
© 1994 Cambridge University Press

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