3D Coalescence Collision of Liquid Drops Using Smoothed Particle Hydrodynamics

Coalescence collision of liquid drops I: Off-center collisions of equal-size drops

“…On the other hand, some important differences with the case of head-on collisions 34 can be observed in the results of the present SPH application to the off-center collisions. In the case of head-on collisions it occurs permanent coalescence for We=4.…”

“…5, and it appears a circular plane section that finally vanishes as the dynamics progresses. 34 In the present SPH application to offcenter collisions, permanent coalescence also occurs for the same value of We but the drop surfaces are now much more deformed giving rise to a different dynamics as a consequence of the rotation of the drops in three dimensional space. Because of the angular momentum gained by the drops the inertial forces have in this case more importance with respect to the surface tension forces than in the head-on collision case.…”

“…34 While for off-center collisions it can be seen the formation of a different filament from the one…”

“…In a previous work we have considered the case of head-on collision of equal-size drops. 34 Finally, an application of the SPH method to describe off-center collisions of different-size drops in three-dimensional space has been recently submitted for publication. 35 …”

Coalescence collision of liquid drops II: Off-center collisions of unequal-size drops

“…The values for the Weber number that we have considered here allow to obtain either permanent coalescence or flocculation of drops, similar to the outcomes obtained by Acevedo-Malavé and García-Sucre in their study of the head-on collision between equal-size water droplets. 19 In the present paper the velocity vector fields were computed for both phenomenon and the evolution of the kinetic and internal energy for the coalescence process is shown. From these outcomes it can be seen that the system tends to the equilibrium as the coalescence dynamics runs.…”