Droplet Dynamics on a Vibrating Fiber: A Numerical Study

Area of Science:

• Fluid dynamics
• Soft matter physics
• Computational physics

Background:

• Droplets on fibers can exist in barrel or clamshell states.
• Understanding droplet dynamics is crucial for applications like fog harvesting.

Purpose of the Study:

• To numerically investigate droplet dynamics on a mechanically excited fiber.
• To characterize droplet response modes under varying vibration conditions.
• To map droplet behavior regimes based on frequency and acceleration amplitude.

Main Methods:

• Phase-field lattice Boltzmann model for numerical simulation.
• Systematic variation of vibration amplitude and frequency.
• Analysis of droplet response modes for vertical and horizontal fiber excitation.

Main Results:

• Clamshell state has higher natural frequency than barrel state.
• Identified multiple droplet response modes (pumping, swinging, slinging).
• Detachment and swinging motions observed under specific conditions.
• Comprehensive regime maps created for different vibration parameters.

Conclusions:

• Vibrating fibers induce complex droplet dynamics with distinct response modes.
• Regime maps provide a framework for controlling droplet behavior.
• Findings offer insights for optimizing droplet-based technologies.