DROP FORMATION IN LIQUID-LIQUID SYSTEMS BEFORE AND AFTER JETTING

The formation of drops resulting from the breakup of an axisymmetric N ewtonian liquid jet injected vertically into another immiscible Newton ian liquid at various Reynolds numbers is investigated here. The full transient from startup to breakup into drops was simulated numerically by solving the time-dependent axisymmetric equations of motion and co ntinuity using a combination of the volume-of-fluid (VOF) and continuo us-surface-force (CSF) methods. The numerical simulation results compa re well with previous experimental data and are significantly more acc urate than previous simplified analyses based on drop formation before and after jetting over a wide range of conditions. (C) 1995 American Institute of Physics.