Abstract
Abstract Understanding pinchoff in a liquid-liquid jet is one of the fundamental problems in the physics of fluid. Pinchoff has a wide variety of applications such as in ink-jet printers. We have numerically investigated the breakup of a forced liquid jet into drops in immiscible liquid-liquid systems with a phase-field model. In the phase-field model, the classical sharp interface between the two immiscible fluids is represented by a transition region of small but finite width. Across this width the composition of one of the two fluids changes continuously. The phase-field method can deal with topological transitions such as breakup and reconnection smoothly without ad hoc “cut and connect” or smoothing procedures. We compared the numerical results on the pinchoff of liquidliquid jets with surface tension finding good agreement with experimental data. In particular, we investigated axial velocity and vorticity structures around the jet neck before and after pinchoff.
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