Convection mixte en fluide binaire avec effet Soret : étude analytique de la transition vers les rouleaux transversaux 2D |
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Authors: | Estelle Piquer Marie-Catherine Charrier-Mojtabi Mejdi Azaiez Abdelkader Mojtabi |
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Institution: | 1. Laboratoire d''énergétique (LESETH), EA 810, UFR PCA, université Paul Sabatier, 118, route de Narbonne, 31062 Toulouse cedex, France;2. Laboratoire MASTER, ENSCPB, 16, avenue Pey Berland, 33607 Pessac cedex, France;3. IMFT, UMR CNRS/INP/UPS 5502, UFR MIG, université Paul Sabatier, 118, route de Narbonne, 31062 Toulouse cedex, France |
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Abstract: | This Note deals with mixed convection in binary fluid with Soret effect in a rectangular duct heated from below. In particular, we study the transition towards transverse 2D rolls appearing at low Reynolds and Rayleigh numbers. The linear stability analysis of Poiseuille flow, with linearly stratified temperature and concentration fields, shows the influence of the separation ratio on the critical Rayleigh number at the transition towards the transversal 2D convective patterns. It highlights the presence, at low Reynolds numbers, of propagating transverse rolls in the downwards as well as in the upwards direction. Finally, we point out that, under these conditions, the propagating frequency of the rolls is the sum of two well defined frequencies: the first related to the Reynolds, the second to the separation ratio. To cite this article: E. Piquer et al., C. R. Mecanique 333 (2005). |
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Keywords: | Mécanique des fluides Convection mixte Mélange binaire Effet Soret Stabilité linéaire Fluid mechanics Mixed convection Binary fluid Soret effect Linear stability |
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