Dripping and Jetting in Coflowing liquid Streams

Dripping to jetting transitions in coflowing liquid streams.

A liquid forced through an orifice into an immiscible fluid ultimately breaks into drops due to surface tension. Drop formation can occur right at the orifice in a dripping process. Alternatively, the inner fluid can form a jet, which breaks into drops further downstream. The transition from dripping to jetting is not understood for coflowing fluid streams, unlike the case of drop formation in ...

Formation of simple and compound drops in microfluidic devices

This work is motivated by the recent experimental development of microfluidic flow-focusing devices that produce highly monodisperse simple or compound drops. Using finite elements with adaptive meshing in a diffuse-interface framework, we simulate the breakup of simple and compound jets in coflowing conditions, and explore the flow regimes that prevail in different parameter ranges. Moreover, ...

Liquid jet breakup and subsequent droplet dynamics under normal gravity and in microgravity conditions

We present an experimental study on the characteristics of liquid jets in different configurations. We consider jets injected perpendicular to gravity, jets injected parallel to gravity, and jets injected in a microgravity environment. We study the role played by gravity in the jet breakup length and in the dynamics of the droplets generated after breakup. We analyze droplets obtained in the dr...

Fluctuation-induced dynamics of multiphase liquid jets with ultra-low interfacial tension Fascinating jet morphologies are observed in perturbation-induced dripping-to-jetting transition in multiphase liquid systems characterized by ultra-low interfacial tensions

Phase Field Simulation of Drop Formation in a Coflowing Fluid

We numerically investigate the dynamics of drop formation when a Newtonian fluid is injected through a tube into another immiscible, co-flowing Newtonian fluid with different density and viscosity using the phase field method. The two phase system is modeled by a coupled three dimensional Cahn-Hilliard and Navier-Stokes equation in cylindrical coordinates. And the contribution from the chemical...