Some of the important applications of two-phase flow are medical aerosols and ink jet printing. In the medical field, it is important that we can produce and isolate drugs that can be inhaled for rapid utilization by the patient. However, this is only possible using advanced aerodynamics that produce a limited size range of particles, from one to five microns. Ink jet printing, though less essential to human existance, is a very interesting challenge. The inks are complex fluids that we must control precisely for fast, high-quality prints.