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Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

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.
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Updated: May 29, 2026

A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)&#8211;Cell Interaction and the Resultant Bioeffects at the Single-cell Level
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Dynamic aspects of small bubble and hydrophilic solid encounters.

Luke Parkinson1, John Ralston

  • 1Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Adelaide SA, Australia.

Advances in Colloid and Interface Science
|September 2, 2011
PubMed
Summary

Understanding bubble-particle attachment is key in colloid science. This review focuses on the crucial attachment step for hydrophilic solids, highlighting recent studies using small bubbles for clearer insights into bubble-particle interactions.

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Area of Science:

  • Colloid Science
  • Surface Chemistry
  • Fluid Dynamics

Background:

  • Bubble-particle interactions are vital in colloid science, impacting processes like flotation and aerosol formation.
  • The attachment phase of bubble-particle interaction is poorly understood, particularly for hydrophilic solids.
  • Existing research often faces challenges due to fluid inertia and surfactant contamination.

Purpose of the Study:

  • To review the literature on bubble-particle attachment processes.
  • To elucidate the critical attachment step in bubble-particle interactions.
  • To highlight recent advancements using single, small bubbles as probes.

Main Methods:

  • Literature review of hydrodynamic and physicochemical processes in bubble-particle attachment.
  • Analysis of studies employing single, small bubbles to probe bubble-hydrophilic particle dynamics.
  • Examination of factors influencing collision, film drainage, and attachment.

Main Results:

  • The attachment process is the least understood aspect of bubble-particle interaction.
  • Hydrophilic solids present unique challenges in bubble attachment.
  • Recent studies with small bubbles offer dynamic insights, minimizing confounding factors.

Conclusions:

  • A comprehensive understanding of bubble-particle attachment is crucial for advancing colloid science.
  • Further research using advanced techniques is needed to fully elucidate attachment mechanisms.
  • Small bubble probes provide a promising avenue for detailed investigation of bubble-hydrophilic particle interactions.