Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing
Contribuinte(s) |
Universitat de Barcelona |
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Data(s) |
26/07/2011
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Resumo |
We consider diffusion of a passive substance C in a phase-separating nonmiscible binary alloy under turbulent mixing. The substance is assumed to have different diffusion coefficients in the pure phases A and B, leading to a spatially and temporarily dependent diffusion ¿coefficient¿ in the diffusion equation plus convective term. In this paper we consider especially the effects of a turbulent flow field coupled to both the Cahn-Hilliard type evolution equation of the medium and the diffusion equation (both, therefore, supplemented by a convective term). It is shown that the formerly observed prolonged anomalous diffusion [H. Lehr, F. Sagués, and J.M. Sancho, Phys. Rev. E 54, 5028 (1996)] is no longer seen if a flow of sufficient intensity is supplied. |
Identificador | |
Idioma(s) |
eng |
Publicador |
The American Physical Society |
Direitos |
c) The American Physical Society, 1997 |
Palavras-Chave | #Dinàmica de fluids #Equacions d'estat #Equilibri químic #Regla de les fases i equilibri #Fluid dynamics #Equations of state #Chemical equilibrium #Phase rule and equilibrium |
Tipo |
info:eu-repo/semantics/article |