Bubble Coalescence
Bubble Coalescence - Related Videos
01:13
Excess Pressure Inside a Drop and a Bubble
0 Views •
2023
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops. where γ corresponds to the surface tension. Recalling that the force per...
08:19
Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Cited by 2 •
2021
A fast and reliable technique is proposed to control the shape oscillations of a single, trapped acoustic bubble that is based on coalescence technique between two bubbles. The steady-state, symmetry-controlled bubble shape oscillations allow analysis of the fluid flow generated in the vicinity of the bubble interface.
07:18
Lipid Bilayer Experiments with Contact Bubble Bilayers for Patch-Clampers
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Cited by 12 •
2019
Here, we present a protocol for the formation of lipid bilayers using a contact bubble bilayer method. A water bubble is blown into an organic solvent, whereby a monolayer is formed at the water-oil interface. Two pipettes are manipulated to dock the bubbles to form a bilayer.
11:08
Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids
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Cited by 23 •
2019
Here, we present a protocol to construct lab-scale bubble column photobioreactors and use them to culture microalgae. It also provides a method for the determination of the culture growth rate and neutral lipid content.
11:14
A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level
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Cited by 8 •
2017
A microfluidic chip was fabricated to produce pairs of gold dots for tandem bubble generation and fibronectin-coated islands for single-cell patterning nearby. The resultant flow field was characterized by particle image velocimetry and was employed to study various bioeffects, including cell membrane poration, membrane deformation, and intracellular calcium response.
FAQs
Film rupture depends on a competition between thinning forces and the film’s ability to remain intact. As approaching bubbles deform their interfaces, hydrodynamic interactions alter the drainage path, while surface tension promotes further thinning. Liquid viscosity, interfacial properties, turbulence, surfactants, and particles therefore determine whether contact produces merger or preserves separate bubbles under the same operating conditions.
Liquid viscosity changes how quickly the separating film drains, whereas surfactants and particles modify interfacial behavior and can alter film stability. Turbulence changes bubble encounters and deformation. Because these factors act together, an engineer cannot predict coalescence from bubble proximity alone; the surrounding liquid and flow environment must be considered when interpreting bubble-size changes.
Coalescence reduces the number of individual bubbles by producing larger ones, while dispersion stability preserves separate interfaces. That distinction matters because bubble size and total gas-liquid contact area change as bubbles merge. Surfactants or particles can influence whether separation persists, so process design must balance desired merger against the need to maintain a stable dispersion.
Larger bubbles generated through repeated merging can change gas-liquid contact area and residence time, which in turn affects multiphase flow behavior. Consequently, coalescence is not merely an interfacial event; it can shift how a gas phase is dispersed through equipment. Monitoring its influence helps connect bubble-scale behavior with process-scale performance in engineering systems.
Control begins by identifying whether a process needs more merger or greater dispersion stability, then examining liquid viscosity, interfacial properties, turbulence, surfactants, and particles. These variables provide practical ways to interpret and manage bubble behavior. Their effects should be considered together because changing one condition may alter film drainage, interface deformation, and the resulting bubble population.
It is important in flotation systems, chemical reactors, wastewater treatment, and foams because each application depends on how gas bubbles interact with a liquid. Coalescence can alter dispersion stability, gas-liquid contact area, mass transfer, or residence time. Understanding the process therefore supports choices aimed at improving separation, reaction performance, treatment behavior, or foam characteristics.
Equipment design must account for coalescence because bubble merging changes multiphase flow behavior rather than only bubble size. The resulting effects on contact area, mass transfer, residence time, and dispersion stability can influence process performance. Engineers use this connection to judge whether a system should encourage merger, limit it, or maintain a controlled balance under its operating conditions.