Numerical Study of the Nonlinear Instability of a Compound Capillary Jet Including the Effect of the Discontinuity of the Undisturbed Axial Velocity (original) (raw)

The nonlinear instability of a (nonviscous) compound jet consisting of a liquid core and immiscible coaxial layer is studied. The equations of motion for both liquids (phases) are used in one-dimensional (1-D) approximation similar to that known for classical one-layer jet. A numerical method is proposed for calculation the radiuses of both interfaces and axial velocities of the core and outer layer. A discontinuity at the interface of the undisturbed axial velocity profile is allowed. Тhe effect of the discontinuity on the jet break-up is studied and illustrated.