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Numerical simulation of binary liquid droplet collision
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10.1063/1.2009527
/content/aip/journal/pof2/17/8/10.1063/1.2009527
http://aip.metastore.ingenta.com/content/aip/journal/pof2/17/8/10.1063/1.2009527

Figures

Image of FIG. 1.
FIG. 1.

The kinetic and geometric parameters of the collision of two equal-sized drops.

Image of FIG. 2.
FIG. 2.

Head-on collision of two water droplets in air. The droplet diameter is and the relative velocity of collision is . In columns a, b, and c, one drop diameter is resolved by 40, 60, and 72 mesh cells, respectively.

Image of FIG. 3.
FIG. 3.

Near head-on collision at , , and , resulting in a reflexive separation with one satellite droplet. One drop diameter is resolved by 60 mesh grids, . (a) simulation; (b) experiment of Qian and Law (Ref. 2).

Image of FIG. 4.
FIG. 4.

Off-center coalescence collision at , , and . One drop diameter is resolved by 64 mesh grids, . (a) simulation; (b) experiment of Qian and Law (Ref. 2).

Image of FIG. 5.
FIG. 5.

Off-center collision at , , and , resulting in a stretching separation with satellite droplets. One drop diameter is resolved by 60 mesh grids, . (a) simulation; (b) experiment of Qian and Law (Ref. 2).

Image of FIG. 6.
FIG. 6.

Near head-on bouncing collision at , , and . One drop diameter is resolved by 80 mesh grids, . (a) simulation; (b) experiment of Qian and Law (Ref. 2).

Image of FIG. 7.
FIG. 7.

Mass conservation during the collision processes.

Image of FIG. 8.
FIG. 8.

Mass conservation during the collision processes. The three simulations for head-on collision of water droplets in air use the same mesh resolution, . The consequences of the collisions are coalescence at , separation with one satellite at , and separation with three satellites at .

Image of FIG. 9.
FIG. 9.

Model of drop deformation during a bouncing collision.

Image of FIG. 10.
FIG. 10.

Comparison of the calculated results with the model by Estrade, Carentz, Lavergne, and Biscos (Ref. 3) for the boundary between bouncing and coalescence regimes. For ethyl alcohol drops in air, , from the experiment (Ref. 3).

Image of FIG. 11.
FIG. 11.

(Color). Distribution of dynamic pressure on the surface of the drops during collision process; the red and blue colors correspond to high and low surface pressure, respectively. The value of pressure is scaled by . The liquid drops are tetradecane in nitrogen. for (a), (b), and (c).

Image of FIG. 12.
FIG. 12.

Collision at a very low Weber number. The liquid drops are tetradecane in nitrogen. One diameter of the initial drop is resolved by 80 mesh grids, . [(a),(b)] simulation; (c) experiment of Qian and Law (Ref. 2).

Image of FIG. 13.
FIG. 13.

(Color). Collision process of water drops in air at various Weber numbers and impact parameters.

Image of FIG. 14.
FIG. 14.

Experimentally observed collision processes of water drops in air at various Weber numbers and impact parameters (from Ashgriz and Poo, Ref. 1).

Image of FIG. 15.
FIG. 15.

(Color). Example of the stretching separation at , , and a large impact parameter, . An indefinite number of satellite droplets is generated. The properties of tetradecane and nitrogen are used in this simulation for liquid drops and ambient gas, respectively.

Image of FIG. 16.
FIG. 16.

(Color). Head-on collisions resulting in satellite droplets, in water/air system. For both cases, .

Image of FIG. 17.
FIG. 17.

Collision regimes from analysis and simulated results.

Tables

Generic image for table
Table I.

Physical properties of the liquids and gases used in the simulations.

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/content/aip/journal/pof2/17/8/10.1063/1.2009527
2005-08-16
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Numerical simulation of binary liquid droplet collision
http://aip.metastore.ingenta.com/content/aip/journal/pof2/17/8/10.1063/1.2009527
10.1063/1.2009527
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