Parisa Armandoost - Department of Mechanical Engineering, Shahrekord University, Shahrekord, Iran
Morteza Bayareh - Department of Mechanical Engineering, Shahrekord University, Shahrekord, Iran
Afshin Ahmadi Nadooshan - Department of Mechanical Engineering, Shahrekord University, Shahrekord, Iran

The collision of two spheroidal drops in a shear flow is simulated in this paper using the finite difference/front tracking method. The influences of deformability, initial offset, and the size of drops on their collision dynamics are assessed. It is demonstrated that the non-dimensional relative trajectory of a pair of drops, ∆z/R, is enhanced gradually as they approach and then, gains a maximum value and finally, reaches a new constant value after separation. An enhancement in the capillary number results in an increase in the deformation of the drops. The deformation and the time required for the collision of two drops are reduced as their initial offset is enhanced. It is revealed that as the ratio of major diameter to minor diameter of spheroidal drops is intensified, their deformation is enhanced.

Front Tracking, Spheroidal Drops, Interaction, Couette Flow