Consultation > Par auteur > Dagois-Bohy Simon

Stabilité linéaire de l'écoulement de films de fluide non-Newtonien sur plan incliné : résultats expérimentaux
Mohamed Hatem Allouche  1, *@  , Valéry Botton  2@  , Séverine Millet  3@  , Daniel Henry  4@  , Simon Dagois-Bohy  3@  , Hamda Ben Hadid  3@  
1 : INSA Euro-Méditerranée - Université Euro-Méditerranéenne de Fès
Route de Meknès, BP 51, Fès -  Maroc
2 : INSA de Lyon
LMFA CNRS UMR 5509
ECL, 36 Avenue Guy de Collongue, 69134 Ecully Cedex. -  France
3 : Université Lyon 1
LMFA CNRS UMR 5509
ECL, 36 Avenue Guy de Collongue, 69134 Ecully Cedex -  France
4 : Ecole Centrale de Lyon
LMFA CNRS UMR 5509
ECL, 36 Avenue Guy de Collongue, 69134 Ecully Cedex. -  France
* : Auteur correspondant

Experimental results of the linear stability of shear-thinning (pseudo-plastic) liquid films flowing under gravity are provided for the first time. We focus on low-concentrated shear-thinning aqueous solutions obeying the Carreau-law. The experimental study essentially consists in measuring wavelengths in marginal conditions, which yields the linear stability threshold for a given slope. In the case of weakly shear-thinning fluids, the experimental results of neutral curves at a given slope are in good agreement with the numerical results obtained by a resolution of the generalized Orr-Sommerfeld equation, and confirm the destabilizing effect of the shear-thinning behaviour in comparison with the Newtonian case (the critical Reynolds number is smaller, and the ratio between the critical wave celerity and an estimation of the flow velocity at the free surface is larger).


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