Wetting Heterogeneities in Porous Media Control Flow Dissipation

Julie Murison, Benoit Semin, Jean-Christophe Baret, Stephan Herminghaus, Matthias Schroeter, Martin Brinkmann

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Abstract

Pressure-controlled displacement of an oil-water interface is studied in dense packings of functionalized glass beads with well-defined spatial wettability correlations. An enhanced dissipation is observed if the typical extension
ξ
of the same-type wetting domains is smaller than the average bead diameter
d
. Three-dimensional imaging using x-ray microtomography shows that the frequencies
n
(
s
)
of residual droplet volumes
s
for different
ξ
collapse onto the same curve. This indicates that the additional dissipation for small
ξ
is due to contact line pinning rather than an increase of capillary break-up and coalescence events.
Original languageEnglish
Article number034002
JournalPhysical Review Applied
Volume2
Issue number3
DOIs
Publication statusPublished - 3 Sep 2014
Externally publishedYes

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