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Particle rotation speeds up capillary interactions.

J Hemauer^1,2, M Qiu^2,3, J J Feng^2,4

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

The European Physical Journal. E, Soft Matter

|March 15, 2021

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.