| Summary: | The results of three-dimensional numerical simulations of drop collisions without the effect of a surrounding
environment are presented. The numerical model is based on an Eulerian, finite-difference, Volume-of-Fluid method.
Surface tension is included using the Continuum Surface Force method. Head-on collisions using equal size drops
with three different fluid properties of water, mercury and tetradecane are presented. Various drop diameters
ranging from 200 μm to 5 mm are considered. A separation criterion based upon deformation data is found. The
lower critical Weber numbers are found for mercury and water drops while tetradecane drops did not result in
separation for the range of Weber numbers considered. The effect of Reynolds number is investigated and regions of
permanent coalescence and separation are plotted in the Weber-Reynolds number plane. The role of viscosity and its
effect on dissipation is also investigated. Finally, the validity of the assumptions made in some of the collision
models is assessed.
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