1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Coalescence of armored interface under impact
Rent:
Rent this article for
USD
10.1063/1.4801320
/content/aip/journal/pof2/25/4/10.1063/1.4801320
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/4/10.1063/1.4801320

Figures

Image of FIG. 1.
FIG. 1.

(a) Single armor experimental set-up: a bare water drop impacts on a water puddle armored with particles of diameter . Two synchronized high speed cameras record side and top views of the impacts. (b) Double armor experimental set-up: an armored water drop impacts on armored interfaces. A high speed camera records a side view of the impacts.

Image of FIG. 2.
FIG. 2.

Top and side views of a drop ( = 2.55 mm) impacting on an armored interface ( = 146 μm) with a velocity = 0.44 m/s. This does not lead to the coalescence of the drop with the bath. The time interval between two consecutive pictures is 667 μ for the top view (a) and 1.1 ms for the side view (b) except for the last images for which the time interval is 35 ms for the top view (a) and 60 ms for the side view (b). In (a) holes between the particles can be observed in the periphery of the drop close to its maximal extension as highlighted by the arrows. The dotted line in (a) is the reference line used to perform the spatio-temporal analysis displayed in Fig. 4 .

Image of FIG. 3.
FIG. 3.

Top and side views of a drop ( = 2.55 mm) impacting on an armored interface ( = 146 μm) with a velocity = 0.60 m/s. The time interval between two consecutive pictures is 667 μs for the top view (a) and 1.1 ms for the side view (b) except for the last images for which the time interval is 10 ms for the top view (a) and 60 ms for the side view (b). This impact leads to the coalescence of the drop with the bath. In (a) holes between the particles can be observed in the periphery of the drop close to its maximal extension as highlighted by the arrows.The dotted line in (a) is the reference line used to perform the spatio-temporal analysis displayed in Fig. 4 .

Image of FIG. 4.
FIG. 4.

Spatio-temporal diagram, which illustrates the motion of the particles along the lines drawn in Figs. 2(a) and 3(a) .

Image of FIG. 5.
FIG. 5.

(a) Evolution of with for two armored puddles with = 134 and = 159 μm. For < 3 mm, decreases with . (b) Evolution of with for a given drop diameter (2.5 mm), increases with . The solid line indicates = 0.2 .

Image of FIG. 6.
FIG. 6.

Evolution of / with = ρ /γ for drop diameters ranging between 2 and 3 mm and particle diameters between 32 and 146 μm. The thick black line corresponds to the maximal diameter of a quiescent bubble at a liquid air-interface as given in Ref. . The dashed grey line corresponds to the limit where the initial spherical drop takes a hemispherical shape.

Image of FIG. 7.
FIG. 7.

(a) and (b) Typical dimensions and shape of the crater formed in the puddle by the impacting drop. (c) Schematic representation of the hydrophobic particles located between the impacting drop and the armored puddle. Satisfying the wetting conditions on both poles, the particles insure a bridge between the drop and the puddle.

Image of FIG. 8.
FIG. 8.

Comparison of and , the experimental threshold velocities for and armor, with the expression given by Eq. (3) . The agreement is very good as the data involving all the particles listed in Table I and drop diameter ranging from 1.8 mm to more than 4 mm collapse.

Image of FIG. 9.
FIG. 9.

(a) Side view of a liquid marble impacting on an armored interface (d = 95 μm). The time interval between two consecutive pictures is 0.5 ms. (a) The impact of the drop ( = 3.4 mm, = 0.49 m/s) leads to non-coalescence. (b) The impact of the drop ( = 4.1 mm, = 0.48 m/s) leads to coalescence.

Image of FIG. 10.
FIG. 10.

Side view of a glass bead impacting on an armored puddle (1 ms elapses between two pictures). Contrary to a drop which remains stuck to the impacting point, the glass bead bounces off leaving the armored puddle.

Tables

Generic image for table
Table I.

Size distributions of the particle lots used for our experiments.

Loading

Article metrics loading...

/content/aip/journal/pof2/25/4/10.1063/1.4801320
2013-04-23
2014-04-16
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Coalescence of armored interface under impact
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/4/10.1063/1.4801320
10.1063/1.4801320
SEARCH_EXPAND_ITEM