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Bouncing, coalescence, and separation in head-on collision of unequal-size droplets
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10.1063/1.3679165
/content/aip/journal/pof2/24/2/10.1063/1.3679165
http://aip.metastore.ingenta.com/content/aip/journal/pof2/24/2/10.1063/1.3679165

Figures

Image of FIG. 1.
FIG. 1.

Photographic images showing representative bouncing collision sequences for tetradecane droplet collisions. (a) (We s, Δ) = (8.5, 1.0); (b) (7.3, 1.46); (c) (7.3, 1.87); (d) (7.0, 2.33).

Image of FIG. 2.
FIG. 2.

Photographic images showing representative coalescence collision sequences for tetradecane droplet collisions. (a) (We s, Δ) = (16.1, 1.0); (b) (13.8, 1.46); (c) (17.6, 1.87); (d) (16.5, 2.33).

Image of FIG. 3.
FIG. 3.

Photographic images showing representative separation collision sequences for tetradecane droplet collisions. (a) (We s, Δ) = (39.1, 1.0); (b) (52.8, 1.50); (c) (58.8, 1.78); (d) (68.0, 2.50). Separation at Δ = 2.5 was not observed up to We s = 68.

Image of FIG. 4.
FIG. 4.

Experimentally identified regime diagram for tetradecane droplet collision.

Image of FIG. 5.
FIG. 5.

Experimentally measured regime diagram for decane droplet collision.

Image of FIG. 6.
FIG. 6.

Experimentally measured regime diagram for water droplet collision.

Image of FIG. 7.
FIG. 7.

Schematic of the three collision stages for unequal-size droplet collision.

Image of FIG. 8.
FIG. 8.

Variation of S1 with We s for the evaluation of viscous loss in Stage 1. Symbols are experimental data and the solid lines are the linear correlations. The inset shows the viscous dissipation coefficient α as a weak function of the size ratio.

Image of FIG. 9.
FIG. 9.

Geometric parameters as a function of the size ratio. Scatters are the experimental measurements and lines are the fitting results.

Image of FIG. 10.
FIG. 10.

Comparison between experimentally measured and model predicted transition Weber numbers as a function of the size ratio for tetradecane, decane, and water droplet collision.

Image of FIG. 11.
FIG. 11.

Relevancy of the present model to different energies, showing that viscous loss in Stage 2 is crucial for determining the size-ratio dependence of the transition Weber number.

Tables

Generic image for table
Table I.

Properties of tested liquids.

Generic image for table
Table II.

Fitting coefficients for geometric parameters.

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/content/aip/journal/pof2/24/2/10.1063/1.3679165
2012-02-01
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Bouncing, coalescence, and separation in head-on collision of unequal-size droplets
http://aip.metastore.ingenta.com/content/aip/journal/pof2/24/2/10.1063/1.3679165
10.1063/1.3679165
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