Bubbles, Drops And Grains

Thermocapillary motion of deformable drops and bubbles

In this paper we report on a numerical method to include Marangoni forces into a finitevolume solver for multi-phase flows. Our work is motivated by the question of whether thermal fluctuations typically found in combustion applications can impact the atomization of fuel drops due to variations in surface tension. To verify and validate our proposed method, we compare our results to theoretical...

Coalescence of bubbles and drops in an outer fluid.

When two liquid drops touch, a microscopic connecting liquid bridge forms and rapidly grows as the two drops merge into one. Whereas coalescence has been thoroughly studied when drops coalesce in vacuum or air, many important situations involve coalescence in a dense surrounding fluid, such as oil coalescence in brine. Here we study the merging of gas bubbles and liquid drops in an external flu...

Drops and Bubbles in Contact with Solid Surfaces

Drops and Bubbles in Contact with Solid Surfaces is intended to give an overview of the science of wetting. It addresses a variety of current research topics, ranging from electrowetting to nanobubbles and complex fluids. Most of the covered topics are highly relevant to many fields, either because they are active research areas (e.g., nanobubbles, wetting of soft surfaces) or because they addr...

Sheathless hydrodynamic positioning of buoyant drops and bubbles inside microchannels.

Particles, bubbles, and drops carried by a fluid in a confined environment such as a pipe can be subjected to hydrodynamic lift forces, i.e., forces that are perpendicular to the direction of the flow. We investigated the positioning effect of lift forces acting on buoyant drops and bubbles suspended in a carrier fluid and flowing in a horizontal microchannel. We report experiments on drops of ...

Bubbles, Drops and Vesicles: The Charm of Microfluidics