A lattice Boltzmann study of viscous coupling effects in immiscible two-phase flow in porous media

Yiotis, AG; Psihogios, J; Kainourgiakis, ME; Papaioannou, A; Stubos, AK

dc.contributor.author	Yiotis, AG	en
dc.contributor.author	Psihogios, J	en
dc.contributor.author	Kainourgiakis, ME	en
dc.contributor.author	Papaioannou, A	en
dc.contributor.author	Stubos, AK	en
dc.date.accessioned	2014-03-01T01:25:41Z
dc.date.available	2014-03-01T01:25:41Z
dc.date.issued	2007	en
dc.identifier.issn	0927-7757	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17725
dc.subject	Immiscible flow	en
dc.subject	Lattice Boltzmann	en
dc.subject	Porous media	en
dc.subject	Viscous coupling	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.other	Capillarity	en
dc.subject.other	Function evaluation	en
dc.subject.other	Mathematical models	en
dc.subject.other	Porous materials	en
dc.subject.other	Solubility	en
dc.subject.other	Wetting	en
dc.subject.other	Density distribution function	en
dc.subject.other	Lattice Boltzmann models	en
dc.subject.other	Viscous coupling	en
dc.subject.other	Two phase flow	en
dc.subject.other	article	en
dc.subject.other	density	en
dc.subject.other	permeability	en
dc.subject.other	porosity	en
dc.subject.other	priority journal	en
dc.subject.other	solid	en
dc.subject.other	steady state	en
dc.subject.other	viscosity	en
dc.subject.other	wettability	en
dc.title	A lattice Boltzmann study of viscous coupling effects in immiscible two-phase flow in porous media	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.colsurfa.2006.12.045	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.colsurfa.2006.12.045	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	In the present paper we study the immiscible two-phase flow in porous media using the lattice Boltzmann model proposed by He et al. [X. He, R. Zhang, S. Chen, G.D. Doolen, Phys. Fluids 11 (1999) 1143-1152]. By considering a set of appropriate boundary conditions for the density distribution function defined in that model, we account for the effect of wettability at solid-fluid interfaces and capillarity in the pores where the fluid-fluid interfaces reside. Different contact angles of the fluid-fluid interface at solid walls can be realized by taking appropriate values for the density distribution function at the solid sites of the porous domain. It is shown that the steady state contact angle is a linear function of the density value assigned to the solid sites. The model is then applied to the study of viscous coupling effects in immiscible two-phase flow in irregular pore networks, with respect to the overall wetting saturation, the viscosity ratio and the wetting angle. Our results show that when the wetting fluid is less viscous than the non-wetting fluid then the apparent relative permeability of the non-wetting phase may take values greater than unity due to the ""lubricating"" effect of the wetting films that cover the solid walls. The proposed model is an ideal tool for modeling immiscible two-phase flow in porous media, due both to its ability to incorporate complicated boundary conditions at the pore walls and also capture the physical aspects of the flow in the bulk and the interfaces. Furthermore, the width of the fluid-fluid interfaces is kept less than 3-4 lattice units allowing for simulations in relatively low resolution porous lattices. © 2006 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Colloids and Surfaces A: Physicochemical and Engineering Aspects	en
dc.identifier.doi	10.1016/j.colsurfa.2006.12.045	en
dc.identifier.isi	ISI:000246548700006	en
dc.identifier.volume	300	en
dc.identifier.issue	1-2 SPEC. ISS.	en
dc.identifier.spage	35	en
dc.identifier.epage	49	en