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Title: Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing
Author: Lehr, Heiner
Sagués i Mestre, Francesc
Sancho, José M.
Keywords: 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
Issue Date: 1997
Publisher: The American Physical Society
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 1997, vol. 56, num. 2, p. 1660-1666
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ISSN: 1539-3755
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Ciència dels Materials i Química Física)

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