Numerical Study of Gas Flow in Super Nanoporous Materials Using the Direct Simulation Monte-Carlo Method

Area of Science:

• Computational physics
• Materials science
• Fluid dynamics

Background:

• Rarefied gas flow in nanoporous materials is crucial for applications like gas separation and storage.
• Understanding heat and fluid transport at the nanoscale is challenging due to complex pore structures.

Purpose of the Study:

• To investigate rarefied gas flow physics in super nanoporous materials using the Direct Simulation Monte Carlo (DSMC) method.
• To evaluate the impact of porosity, Knudsen number, and thermal boundary conditions on flow characteristics.

Main Methods:

• Employed the Direct Simulation Monte Carlo (DSMC) method, a particle-based approach for gas kinetic simulations.
• Simulated argon gas flow across a range of porosities (0.5–0.9), Knudsen numbers (0.05–1.0), and thermal conditions.
• Compared simulation results with existing theoretical and numerical models.

Main Results:

• Apparent permeability, hydraulic tortuosity, and skin friction factor increase as material porosity decreases.
• Hydraulic tortuosity and skin friction factor decrease with increasing Knudsen number, enhancing apparent permeability.
• Skin friction factor and apparent permeability increase with rising wall heat flux at a constant Knudsen number.

Conclusions:

• DSMC is effective for modeling rarefied gas flow in nanoporous structures.
• Material porosity and Knudsen number significantly influence gas flow properties.
• Thermal boundary conditions, specifically heat flux, affect flow behavior and apparent permeability.