Ternary Free-Energy Entropic Lattice Boltzmann Model with a High Density Ratio

Area of Science:

• Multiphase flow dynamics
• Computational fluid dynamics
• Thermodynamics

Background:

• Simulating complex fluid systems with multiple components is challenging.
• Existing models often struggle with high density ratios and diverse surface tension effects.
• Understanding droplet interactions is crucial for various industrial processes.

Purpose of the Study:

• To develop a thermodynamically consistent free energy model for one-gas, two-liquid flows.
• To implement the model using the entropic lattice Boltzmann scheme.
• To investigate its capability in handling high density ratios and various wetting phenomena.

Main Methods:

• Developed a novel thermodynamically consistent free energy model.
• Implemented the model using the entropic lattice Boltzmann scheme.
• Simulated fluid flows with high density ratios (O(10^3)) and broad surface tension ratios.

Main Results:

• The model successfully simulates partial and full wetting states, including Neumann triangles and complete encapsulation.
• It accurately captures bouncing, adhesive, and insertive regimes in binary droplet collisions.
• Demonstrated the model's capability for complex multiphase flow scenarios.

Conclusions:

• The presented model offers a robust framework for simulating one-gas, two-liquid systems.
• It provides accurate predictions for interfacial phenomena and droplet dynamics.
• This work expands possibilities for multiphase flow applications.