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

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 diffusio...

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Autores: Lehr, Heiner, Sagués i Mestre, Francesc, Sancho, José M.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1997
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/18698
Acceso en línea:https://hdl.handle.net/2445/18698
Access Level:acceso abierto
Palabra clave: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
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spelling Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixingLehr, HeinerSagués i Mestre, FrancescSancho, José M.Dinàmica de fluidsEquacions d'estatEquilibri químicRegla de les fases i equilibriFluid dynamicsEquations of stateChemical equilibriumPhase rule and equilibriumWe 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.The American Physical Society201120111997info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion7 p.application/pdfhttps://hdl.handle.net/2445/18698Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: http://dx.doi.org/10.1103/PhysRevE.56.1660Physical Review E, 1997, vol. 56, num. 2, p. 1660-1666http://dx.doi.org/10.1103/PhysRevE.63.051602http://dx.doi.org/10.1103/PhysRevE.63.051602(c) The American Physical Society, 1997info:eu-repo/semantics/openAccessoai:recercat.cat:2445/186982026-05-29T05:05:01Z
dc.title.none.fl_str_mv Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing
title Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing
spellingShingle Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing
Lehr, Heiner
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
title_short Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing
title_full Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing
title_fullStr Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing
title_full_unstemmed Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing
title_sort Diffusion in spatially and temporarily inhomogeneous media: Effects of turbulent mixing
dc.creator.none.fl_str_mv Lehr, Heiner
Sagués i Mestre, Francesc
Sancho, José M.
author Lehr, Heiner
author_facet Lehr, Heiner
Sagués i Mestre, Francesc
Sancho, José M.
author_role author
author2 Sagués i Mestre, Francesc
Sancho, José M.
author2_role author
author
dc.subject.none.fl_str_mv 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
topic 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
description 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.
publishDate 1997
dc.date.none.fl_str_mv 1997
2011
2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/18698
url https://hdl.handle.net/2445/18698
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: http://dx.doi.org/10.1103/PhysRevE.56.1660
Physical Review E, 1997, vol. 56, num. 2, p. 1660-1666
http://dx.doi.org/10.1103/PhysRevE.63.051602
http://dx.doi.org/10.1103/PhysRevE.63.051602
dc.rights.none.fl_str_mv (c) The American Physical Society, 1997
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The American Physical Society, 1997
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 7 p.
application/pdf
dc.publisher.none.fl_str_mv The American Physical Society
publisher.none.fl_str_mv The American Physical Society
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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