Ternary free-energy entropic lattice Boltzmann model with high density ratio

TL;DR

This paper introduces a thermodynamically consistent ternary fluid model using entropic lattice Boltzmann methods, capable of handling high density ratios and diverse wetting behaviors, enabling advanced multiphase flow simulations.

Contribution

The paper presents a novel free energy lattice Boltzmann model for ternary fluids with high density ratios, covering various wetting states and collision regimes.

Findings

Successfully models density ratios up to 10^3

Captures partial and full wetting states

Simulates droplet collision behaviors

Abstract

A rigorous free energy model for ternary fluid flows with density ratio up to of order $O(10^3)$ is presented and implemented using the entropic lattice Boltzmann scheme. The model is thermodynamically consistent and allows a broad range of surface tension ratios, covering both partial wetting states where Neumann triangles are formed, and full wetting states where complete encapsulation of one of fluid components is observed. We further demonstrate that we can capture the bouncing, adhesive and insertive regimes for the binary collisions between immiscible droplets suspended in air. Our approach opens up a vast range of multiphase flow applications involving one gas and several liquid components.