Pore geometry control of apparent wetting in porous media

Abstract Wettability, or preferential affinity of a fluid to a solid substrate in the presence of another fluid, plays a critical role in the statics and dynamics of fluid-fluid displacement in porous media. The complex confined geometry of porous media, however, makes upscaling of microscopic wetta...

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Autores principales:	Harris Sajjad Rabbani, Benzhong Zhao, Ruben Juanes, Nima Shokri
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Apparent Moisture Pore Geometry Porous Media Convex Interface Fluid-fluid Displacement Medicine R Science Q
Acceso en línea:	https://doaj.org/article/04559b3d82ae47f3be42b2105883bd29
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spelling	oai:doaj.org-article:04559b3d82ae47f3be42b2105883bd292021-12-02T15:08:41ZPore geometry control of apparent wetting in porous media10.1038/s41598-018-34146-82045-2322https://doaj.org/article/04559b3d82ae47f3be42b2105883bd292018-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-34146-8https://doaj.org/toc/2045-2322Abstract Wettability, or preferential affinity of a fluid to a solid substrate in the presence of another fluid, plays a critical role in the statics and dynamics of fluid-fluid displacement in porous media. The complex confined geometry of porous media, however, makes upscaling of microscopic wettability to the macroscale a nontrivial task. Here, we elucidate the contribution of pore geometry in controlling the apparent wettability characteristics of a porous medium. Using direct numerical simulations of fluid-fluid displacement, we study the reversal of interface curvature in a single converging-diverging capillary, and demonstrate the co-existence of concave and convex interfaces in a porous medium—a phenomenon that we also observe in laboratory micromodel experiments. We show that under intermediate contact angles the sign of interface curvature is strongly influenced by the pore geometry. We capture the interplay between surface chemical properties and pore geometry in the form of a dimensionless quantity, the apparent wettability number, which predicts the conditions under which concave and convex interfaces co-exist. Our findings advance the fundamental understanding of wettability in confined geometries, with implications to macroscopic multiphase-flow processes in porous media, from fuel cells to enhanced oil recovery.Harris Sajjad RabbaniBenzhong ZhaoRuben JuanesNima ShokriNature PortfolioarticleApparent MoisturePore GeometryPorous MediaConvex InterfaceFluid-fluid DisplacementMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Apparent Moisture Pore Geometry Porous Media Convex Interface Fluid-fluid Displacement Medicine R Science Q
spellingShingle	Apparent Moisture Pore Geometry Porous Media Convex Interface Fluid-fluid Displacement Medicine R Science Q Harris Sajjad Rabbani Benzhong Zhao Ruben Juanes Nima Shokri Pore geometry control of apparent wetting in porous media
description	Abstract Wettability, or preferential affinity of a fluid to a solid substrate in the presence of another fluid, plays a critical role in the statics and dynamics of fluid-fluid displacement in porous media. The complex confined geometry of porous media, however, makes upscaling of microscopic wettability to the macroscale a nontrivial task. Here, we elucidate the contribution of pore geometry in controlling the apparent wettability characteristics of a porous medium. Using direct numerical simulations of fluid-fluid displacement, we study the reversal of interface curvature in a single converging-diverging capillary, and demonstrate the co-existence of concave and convex interfaces in a porous medium—a phenomenon that we also observe in laboratory micromodel experiments. We show that under intermediate contact angles the sign of interface curvature is strongly influenced by the pore geometry. We capture the interplay between surface chemical properties and pore geometry in the form of a dimensionless quantity, the apparent wettability number, which predicts the conditions under which concave and convex interfaces co-exist. Our findings advance the fundamental understanding of wettability in confined geometries, with implications to macroscopic multiphase-flow processes in porous media, from fuel cells to enhanced oil recovery.
format	article
author	Harris Sajjad Rabbani Benzhong Zhao Ruben Juanes Nima Shokri
author_facet	Harris Sajjad Rabbani Benzhong Zhao Ruben Juanes Nima Shokri
author_sort	Harris Sajjad Rabbani
title	Pore geometry control of apparent wetting in porous media
title_short	Pore geometry control of apparent wetting in porous media
title_full	Pore geometry control of apparent wetting in porous media
title_fullStr	Pore geometry control of apparent wetting in porous media
title_full_unstemmed	Pore geometry control of apparent wetting in porous media
title_sort	pore geometry control of apparent wetting in porous media
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/04559b3d82ae47f3be42b2105883bd29
work_keys_str_mv	AT harrissajjadrabbani poregeometrycontrolofapparentwettinginporousmedia AT benzhongzhao poregeometrycontrolofapparentwettinginporousmedia AT rubenjuanes poregeometrycontrolofapparentwettinginporousmedia AT nimashokri poregeometrycontrolofapparentwettinginporousmedia
_version_	1718388040636825600

Pore geometry control of apparent wetting in porous media

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