Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing


Autoria(s): Lehr, Heiner; Sagués i Mestre, Francesc; Sancho, José M.
Contribuinte(s)

Universitat de Barcelona

Data(s)

26/07/2011

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

http://hdl.handle.net/2445/18698

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