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Descripción
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| We study the linear stability with respect to lateral perturbations of free surface films of polymer mixtures on solid substrates. The study focuses on the stability properties of the stratified and homogeneous steady film states studied in Part I U. Thiele, S. Madruga, and L. Frastia, Phys. Fluids 19, 122106 2007. To this aim, the linearized bulk equations and boundary equations are solved using continuation techniques for several different cases of energetic bias at the surfaces corresponding to linear and quadratic solutal Marangoni effects. For purely diffusive transport, an increase in the film thickness either exponentially decreases the lateral instability or entirely stabilizes the film. Including convective transport leads to a further destabilization as compared to the purely diffusive case. In some cases the inclusion of convective transport and the related widening of the range of available film configurations it is then able to change its surface profile change the stability behavior qualitatively. We furthermore present results regarding the dependence of the instability on several other parameters, namely, the Reynolds number, the surface tension number, and the ratio of the typical velocities of convective and diffusive transport. © 2009 American Institute of Physics. DOI: 10.1063/1.3132789 | |
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Internacional
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Si |
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JCR del ISI
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Si |
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Título de la revista
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PHYSICS OF FLUIDS |
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ISSN
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1070-6631 |
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Factor de impacto JCR
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1,738 |
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Información de impacto
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Volumen
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21 |
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DOI
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Número de revista
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0 |
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