Note on Dynamics of inertia dominated binary drop collisions [Phys. Fluids 16, 3438 (2004)]

The analytical approach shown in the paper [I. V. Roisman, Dynamics of inertia dominated binary drop collisions, Phys. Fluids 16, 3438 (2004)] has been found not to yield physically consistent results, for which the theoretically predicted initial kinetic energy of the radially expanding lamella is negative. Such theoretical predictions do not allow the ensuing computation of the flow field. The code for the numerical predictions of the evolution of the drop diameter includes a computational bug with which only a quarter of the dissipated energy is accounted for. Three possible sources of the error are identified: the assumed velocity field in the lamella, the shape of the lamella at the initial phase of drop deformation, and the energy balance formulation of the problem. A possible way for the improvement of the modeling of the dynamics of the initial stage of drop collision is proposed.