Breakup, Coalescence, and Migration Regularity of Bubbles under Gas–Liquid Swirling Flow in Gas–Liquid Cylindrical Cyclone

Perturbed breakup of gas bubbles in water: memory, gas flow, and coalescence.

The pinch-off of an air bubble from an underwater nozzle ends in a singularity with a remarkable sensitivity to a variety of perturbations. I report on experiments that break both the axial (i.e., vertical) and azimuthal symmetry of the singularity formation. The density of the inner gas influences the axial asymmetry of the neck near pinch-off. For denser gases, flow through the neck late in c...

Local Velocity Measurements and Computational Fluid Dynamics (cfd) Simulations of Swirling Flow in a Cylindrical Cyclone Separator

ABSTRACT Local measurements and 3-D CFD simulations in GasLiquid cylindrical Cyclone (GLCC) separators are scarce. The main objective of this study is to conduct local measurements and 3-D CFD simulations to understand the swirling flow behavior in a cylindrical cyclone with one inclined tangential inlet. Axial and tangential velocities and turbulent intensities across the GLCC diameter (ID=3.5...

Breakup of air bubbles in water: memory and breakdown of cylindrical symmetry.

Using high-speed video, we have studied air bubbles detaching from an underwater nozzle. As a bubble distorts, it forms a thin neck which develops a singular shape as it pinches off. As in other singularities, the minimum neck radius scales with the time until the breakup. However, because the air-water interfacial tension does not drive the breakup, even small initial cylindrical asymmetries a...

Partial coalescence of soap bubbles

Coalescence and Breakup of Oppositely Charged Droplets

The coalescence process of oppositely charged drops for different electrical conductivities of liquids is presented. When the electrical conductivity was relatively low, oppositely charged drops failed to coalesce under sufficiently high electrical fields and capillary ripples were formed on the surfaces of droplets after rebound. For a high electrically conductive liquid, it was found that a c...