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Coalescence collision of liquid drops I: Off-center collisions of equal-size drops
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38.For droplet of different sizes the Weber number is defined as: where ds is the diameter of the smallest droplet.
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The Smoothed Particle Hydrodynamics method (SPH) is used here to model off-center collisions of equal-size liquiddrops in a three-dimensional space. In this study the Weber number is calculated for several conditions of the dropletsdynamics and the velocity vector fields formed inside the drops during the collision process are shown. For the permanent coalescence the evolution of the kinetic and internal energy is shown and also the approaching to equilibrium of the resulting drop. Depending of the Weber number three possible outcomes for the collision of droplets is obtained: permanent coalescence, flocculation and fragmentation. The fragmentation phenomena are modeled and the formation of small satellite drops can be seen. The ligament that is formed follows the “end pinching” mechanism and it is transformed into a flat structure.
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