Abstract: Dynamic breakup of a Newtonian axisymmetric liquid jet injected into another immiscible Newtonian liquid was investigated. The full transient process from jet start-up to breakup into drops was simulated numerically by solving the timedependent axisymmetric equations of motion and continuity using an algorithm based on the finite volume method and the volume of fluid (VOF) method. In the present work, the physics was captured about the jet breakup and drop formation, the relation was given between jet core length and Weber number and velocity and pressure distributions was also obtained.

Key words: incompressible flow, numerical simulation, Rayleigh, volume of fluid (VOF) method, jets