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Related Concept Videos

Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

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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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Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the...
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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Bubble rubbing on solid surface: experimental study.

Stoyan I Karakashev1, Klaus W Stöckelhuber, Roumen Tsekov

  • 1Department of Physical Chemistry, Sofia University, 1164 Sofia, Bulgaria.

Journal of Colloid and Interface Science
|October 23, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel interferometric method to measure the 3D thickness of wetting films between bubbles and moving surfaces. Findings reveal film thickness and lift pressure linearly depend on surface speed, enabling new tribological insights.

Keywords:
BubbleFrictionInterferometryLift forceThin wetting filmsTribology

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Area of Science:

  • Fluid Dynamics
  • Surface Science
  • Interfacial Phenomena

Background:

  • Wetting films between bubbles and solid surfaces are crucial in various industrial processes.
  • Understanding their behavior under dynamic conditions is essential for process optimization.
  • Previous studies lacked detailed analysis of film dynamics in such configurations.

Purpose of the Study:

  • To investigate the 3D thickness profiles of wetting films entrapped between a bubble and a moving solid substrate.
  • To analyze the relationship between film thickness, disjoining pressure, lift pressure, and viscous stress with solid surface velocity.
  • To develop and validate a novel interferometric technique for this purpose.

Main Methods:

  • Development of a unique experimental setup for real-time monitoring.
  • Application of a specialized procedure for determining 3D film thickness profiles.
  • Utilizing interferometry to capture dynamic changes in film geometry.

Main Results:

  • A strong linear dependence of average film thickness on solid surface speed was observed up to a critical velocity.
  • Average lift pressure also showed a similar linear trend with surface speed.
  • Film surface inhomogeneity was found to change with increasing solid surface velocity.

Conclusions:

  • The developed interferometric technique provides new possibilities for investigating bubble-solid surface interactions in relative motion.
  • The study establishes quantitative relationships between film characteristics and solid surface velocity.
  • Findings pave the way for detailed tribological studies of dynamic bubble-solid interfaces.