Numerical Simulation of Gas–Liquid Transport in Porous Media

Gas–liquid transport in porous media is analyzed with a focus on carbon-nanotube-based air electrodes for non-aqueous Li–air batteries. Trapped gas within porous structures can influence liquid infiltration and oxygen transport, both of which are important for battery performance. A three-dimensional MRT color gradient LBM is employed to model high-density-ratio two-phase flow in complex carbon nanotube geometries. Model validation through relative permeability analysis is also discussed, followed by simulations examining the effects of porosity, wettability, and viscosity ratio on fluid distribution within porous electrodes.