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.
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 language | English |
|---|---|
| Article number | 034002 |
| Journal | Physical Review Applied |
| Volume | 2 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 3 Sept 2014 |
| Externally published | Yes |