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Weakly nonlinear analysis of Rayleigh–Bénard convection in shear-thinning fluids: nature of the bifurcation and pattern selection

Published online by Cambridge University Press:  20 February 2015

M. Bouteraa ,
C. Nouar ,
E. Plaut ,
C. Metivier  and
A. Kalck
M. Bouteraa
Affiliation:
LEMTA, UMR 7563 CNRS-Université de Lorraine, 2 Avenue de la Forêt de Haye, TSA 60604, 54516 Vandoeuvre lès Nancy CEDEX, France
C. Nouar*
Affiliation:
LEMTA, UMR 7563 CNRS-Université de Lorraine, 2 Avenue de la Forêt de Haye, TSA 60604, 54516 Vandoeuvre lès Nancy CEDEX, France
E. Plaut
Affiliation:
LEMTA, UMR 7563 CNRS-Université de Lorraine, 2 Avenue de la Forêt de Haye, TSA 60604, 54516 Vandoeuvre lès Nancy CEDEX, France
C. Metivier
Affiliation:
LEMTA, UMR 7563 CNRS-Université de Lorraine, 2 Avenue de la Forêt de Haye, TSA 60604, 54516 Vandoeuvre lès Nancy CEDEX, France
A. Kalck
Affiliation:
LEMTA, UMR 7563 CNRS-Université de Lorraine, 2 Avenue de la Forêt de Haye, TSA 60604, 54516 Vandoeuvre lès Nancy CEDEX, France
*
†Email address for correspondence: cherif.nouar@univ-lorraine.fr
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Abstract

A linear and weakly nonlinear analysis of convection in a layer of shear-thinning fluids between two horizontal plates heated from below is performed. The objective is to examine the effects of the nonlinear variation of the viscosity with the shear rate on the nature of the bifurcation, the planform selection problem between rolls, squares and hexagons, and the consequences on the heat transfer coefficient. Navier’s slip boundary conditions are used at the top and bottom walls. The shear-thinning behaviour of the fluid is described by the Carreau model. By considering an infinitesimal perturbation, the critical conditions, corresponding to the onset of convection, are determined. At this stage, non-Newtonian effects do not come into play. The critical Rayleigh number decreases and the critical wavenumber increases when the slip increases. For a finite-amplitude perturbation, nonlinear effects enter in the dynamic. Analysis of the saturation coefficients at cubic order in the amplitude equations shows that the nature of the bifurcation depends on the rheological properties, i.e. the fluid characteristic time and shear-thinning index. For weakly shear-thinning fluids, the bifurcation is supercritical and the heat transfer coefficient increases, as compared with the Newtonian case. When the shear-thinning character is large enough, the bifurcation is subcritical, pointing out the destabilizing effect of the nonlinearities arising from the rheological law. Departing from the onset, the weakly nonlinear analysis is carried out up to fifth order in the amplitude expansion. The flow structure, the modification of the viscosity field and the Nusselt number are characterized. The competition between rolls, squares and hexagons is investigated. Unlike Albaalbaki & Khayat (J. Fluid. Mech., vol. 668, 2011, pp. 500–550), it is shown that in the supercritical regime, only rolls are stable near onset.

JFM classification

Complex Fluids: Complex Fluids Instability: Nonlinear instability
Type
Papers
Information
Journal of Fluid Mechanics , Volume 767 , 25 March 2015 , pp. 696 - 734
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© 2015 Cambridge University Press 

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