1 research outputs found
Whipping of electrified liquid jets
Weapply an electric field to amoderately conducting liquid surrounded
by another coflowing liquid, all inside a glass-based microfluidic device,
to study nonaxisymmetric instabilities.Wefind that the bending of the
electrified jet results in a steady-state, helicoidal structure with a
constant opening angle. Remarkably, the characteristic phase speed of
the helicoidalwave only depends on the charge carried by the jet in the
helicoidal region and its stability critically depends on the properties of
the coflowing liquid. In fact, the steady-state helical structure becomes
chaotic when the longest characteristic time is that of the inner liquid
rather than that of the outer coflowing liquid. We also perform
a numerical analysis to show that the natural preference of the jet is
to adopt the conical helix structure observed experimentally