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Capillary interactions between dynamically forced particles adsorbed at a planar interface and on a bubble
1Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom.
Journal of Fluid Mechanics
|June 9, 2018
Summary
Micrometric particles create dynamic interfacial deformations and capillary forces. These forces are non-monotonic and can be repulsive, impacting particle interactions under various dynamic forcing mechanisms.
Area of Science:
- Fluid dynamics
- Interfacial phenomena
- Soft matter physics
Background:
- Micrometric particles can deform fluid interfaces.
- Periodic forces drive particle dynamics and interfacial interactions.
Purpose of the Study:
- To investigate dynamic interfacial deformation caused by micrometric particles.
- To analyze the resulting lateral capillary interactions and forces.
Main Methods:
- Derivation of analytical formulas for dynamic interfacial deformation.
- Assumption of small deformations, negligible viscosity, and point particles.
- Superposition of deformations from two point forces to evaluate lateral forces.
Main Results:
- Dynamic point forces generate capillary waves on planar interfaces.
- On bubbles, forces excite shape oscillations dependent on bubble radius and forcing frequency.
- Lateral capillary forces between dynamically forced particles are non-monotonic and can be repulsive.
Conclusions:
- Analytical models predict dynamic interfacial deformation and capillary forces.
- Results are applicable to particles driven by magnetic, electric, or acoustic fields.
- Understanding these forces is crucial for controlling particle behavior in dynamic systems.
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