Analytical model for thermal boundary conductance and equilibrium thermal accommodation coefficient at solid/gas...

Area of Science:

• Materials Science
• Physical Chemistry
• Thermodynamics

Background:

• Understanding thermal boundary conductance is crucial for heat transfer in heterogeneous systems.
• Accurate modeling of solid-gas interfaces is essential for various applications, including microelectronics and energy systems.
• Existing models often struggle with the complexities of energy transfer at the solid-gas interface.

Purpose of the Study:

• To develop an analytical model for thermal boundary conductance between solids and gases.
• To determine the equilibrium thermal accommodation coefficient using the developed model.
• To validate the model's predictions against molecular dynamics simulations.

Main Methods:

• Analytical modeling of thermal fluxes in solid and gas phases.
• Application of diffuse mismatch theory to describe energy transmission across the solid/gas interface.
• Comparison of model predictions with molecular dynamics simulations for validation.

Main Results:

• The analytical model successfully predicts thermal boundary conductances at solid/gas interfaces.
• The model accurately determines the equilibrium thermal accommodation coefficient.
• Model predictions show good agreement with molecular dynamics simulations for non-cryogenic temperatures and strong solid-gas interactions.

Conclusions:

• The developed analytical model is effective for predicting thermal accommodation of gases on solid surfaces.
• The model is applicable under conditions of non-cryogenic temperatures and relatively strong solid-gas interactions.
• This work provides a valuable tool for understanding and engineering heat transfer at solid-gas interfaces.