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Stability of plane Poiseuille flow of a dilute suspension of slender fibres

Published online by Cambridge University Press:  12 April 2006

Fritz H. Bark  and
Hernán Tinoco
Fritz H. Bark
Affiliation:
Department of Mechanics, The Royal Institute of Technology, Stockholm, Sweden
Hernán Tinoco
Affiliation:
Department of Mechanics, The Royal Institute of Technology, Stockholm, Sweden
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Abstract

The linear hydrodynamic stability problem for plane Poiseuille flow of a dilute suspension of rigid fibres is solved numerically. The constitutive equation given by Batchelor (1970a, b, 1971) is used to model the rheological properties of the suspension. The resulting eigenvalue problem is shown to be singular. The appropriate contour in the complex plane is determined by considering an initial-value problem. It is shown that, for a fixed, but not too large, inclination of the wave front to the mean flow, the fibres cause the critical Reynolds number to increase monotonically with the product of the volume fraction of the fibres and the square of their aspect ratio. The stabilizing influence of the fibres seems to vanish for large wave inclination angles.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 87 , Issue 2 , 26 July 1978 , pp. 321 - 333
Copyright
© 1978 Cambridge University Press

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