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Particle rotation speeds up capillary interactions.

J Hemauer1,2, M Qiu2,3, J J Feng2,4

  • 1Department of Mechanical Engineering, Technical University of Munich, 85748, Garching, Germany.

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Summary
This summary is machine-generated.

Particle rotation accelerates capillary attraction between particles at fluid interfaces. This effect is more pronounced with greater viscosity differences, as rotation reduces drag forces on the particles.

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Area of Science:

  • Fluid dynamics
  • Interfacial phenomena
  • Computational physics

Background:

  • Capillary interactions are crucial for particle assembly at fluid interfaces.
  • Understanding particle rotation effects on these interactions is key for predicting assembly behavior.

Purpose of the Study:

  • To investigate the impact of particle rotation on pairwise capillary interactions at a fluid interface.
  • To quantify the relationship between particle rotation, fluid viscosity, and interaction dynamics.

Main Methods:

  • Dynamic numerical simulations using a phase-field method coupled with Navier-Stokes equations.
  • Finite element scheme in a bounded two-dimensional geometry.
  • Analysis of capillary, viscous forces, torques, and drag forces on translating and rotating particles.

Main Results:

  • Freely rotating particles exhibit faster capillary attraction compared to inhibited rotation.
  • The effect of particle rotation on attraction speed increases with higher viscosity mismatch.
  • Rotational effects on particle rotation due to interfacial deformations are negligible.
  • Translational drag force on rotating particles is reduced due to attenuated velocity gradients.

Conclusions:

  • Particle rotation significantly enhances capillary attraction dynamics at fluid interfaces.
  • Viscosity mismatch amplifies the beneficial effect of rotation on particle interaction speed.
  • Reduced drag on rotating particles is the primary mechanism driving faster attraction.