Consistent simulation of droplet evaporation based on the phase-field multiphase lattice Boltzmann method

Area of Science:

• Multiphase flow modeling
• Thermodynamics
• Computational fluid dynamics

Background:

• Previous models had limitations in predicting evaporation across arbitrary temperatures.
• Accurate modeling of phase change phenomena is crucial for various engineering applications.

Purpose of the Study:

• To extend and generalize a previous model for droplet evaporation.
• To incorporate vapor concentration gradients as a driving force for vaporization.
• To enable evaporation modeling at arbitrary temperatures.

Main Methods:

• Utilized a lattice Boltzmann phase-field multiphase modeling approach.
• Employed a modified convective Cahn-Hilliard equation for interface dynamics.
• Modeled the coupling between vapor concentration and temperature using the Clausius-Clapeyron correlation.

Main Results:

• The model successfully predicts flow features around and inside evaporating droplets.
• Quantitative predictions were achieved in both quiescent and convective environments.
• Validation tests in 1D and 2D cases demonstrated model consistency.

Conclusions:

• The developed model provides a robust framework for simulating droplet evaporation.
• The inclusion of vapor concentration gradients enhances predictive accuracy.
• The model is applicable to a wide range of thermal and flow conditions.