A 2-D pore-network model of the drying of single-component liquids in porous media

Yiotis, AG; Stubos, AK; Boudouvis, AG; Yortsos, YC

dc.contributor.author	Yiotis, AG	en
dc.contributor.author	Stubos, AK	en
dc.contributor.author	Boudouvis, AG	en
dc.contributor.author	Yortsos, YC	en
dc.date.accessioned	2014-03-01T01:15:58Z
dc.date.available	2014-03-01T01:15:58Z
dc.date.issued	2001	en
dc.identifier.issn	0309-1708	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13860
dc.subject	drying	en
dc.subject	porous media	en
dc.subject	pore network	en
dc.subject	capillary pressure	en
dc.subject	invasion percolation	en
dc.subject.classification	Water Resources	en
dc.subject.other	IMMISCIBLE DISPLACEMENT	en
dc.subject.other	INVASION PERCOLATION	en
dc.subject.other	VISUALIZATION	en
dc.subject.other	EVAPORATION	en
dc.subject.other	SIMULATION	en
dc.subject.other	TRANSPORT	en
dc.subject.other	MIXTURE	en
dc.title	A 2-D pore-network model of the drying of single-component liquids in porous media	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0309-1708(00)00066-X	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0309-1708(00)00066-X	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	The drying of liquid-saturated porous media is typically approached using macroscopic continuum models involving phenomenological coefficients. Insight on these coefficients can be obtained by a more fundamental study at the pore- and pore-network levels. In this paper, we present a model based on a pore-network representation of porous media that accounts for various processes at the pore-scale. These include mass transfer by advection and diffusion in the gas phase, viscous flow in liquid and gas phases and capillary effects at the gas-liquid menisci in the pore throats. We consider isothermal drying in a rectilinear horizontal geometry, with no-how conditions in all but one boundary, at which a purge gas is injected at a constant rate. The problem is mainly characterized by two dimensionless parameters, a diffusion-based capillary number, Ca, and a Peclet number, Pe, in addition to the various geometrical parameters of the pore network. Results on the evolution of the liquid saturation, the trapped liquid islands and the drying rate are obtained as a function of time and the dimensionless parameters. The importance of trapped liquid islands on screening mass transfer to the continuous liquid cluster is emphasized. For fixed parameter values, the drying front does not in general obey invasion percolation rules. However, as drying progresses, and depending on the relative magnitude of the capillary and Peclet numbers, a transition to a percolation-controlled problem occurs. Effects of capillarity and mass transfer on Saturation profiles and drying rates are discussed. The results are then used to discuss upscaling to continuum models. (C) 2001 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	ADVANCES IN WATER RESOURCES	en
dc.identifier.doi	10.1016/S0309-1708(00)00066-X	en
dc.identifier.isi	ISI:000166845100013	en
dc.identifier.volume	24	en
dc.identifier.issue	3-4	en
dc.identifier.spage	439	en
dc.identifier.epage	460	en