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Experimental study of the velocity field in Rayleigh-Bénard convection

Published online by Cambridge University Press:  12 April 2006

M. Dubois  and
P. Bergé
M. Dubois
Affiliation:
Commissariat à l'Energie Atomique, Division de la Physique, Centre d'Etudes Nucléaires de Saclay, B.P. 2, 91190 Gif-sur-Yvette, France
P. Bergé
Affiliation:
Commissariat à l'Energie Atomique, Division de la Physique, Centre d'Etudes Nucléaires de Saclay, B.P. 2, 91190 Gif-sur-Yvette, France
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Abstract

Local velocity measurements performed in a convecting layer of fluid show that the velocity field can be described by a dominant fundamental velocity mode mixed with an increasing proportion of second and third harmonics as ε, the reduced distance to the convective threshold Rc, is increased from 0 to ∼ 10. The spatial and thermal dependences of the amplitudes of these different modes are reported and compared with theoretical predictions.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 85 , Issue 4 , 27 April 1978 , pp. 641 - 653
Copyright
© 1978 Cambridge University Press

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