One-dimensional flows of a polyatomic gas in the presence of an adsorbing-desorbing surface kept at constant and uniform temperature are simulated by numerically solving the Boltzmann kinetic equation by the Direct Simulation Monte Carlo (DSMC) method. It is considered the flow of gas between two planar and infinite surfaces, where only one surface is able to adsorb and desorb molecules, while the other one is impermeable. Borgnakke-Larsen model is used to describe inelastic collisions dynamics for a gas of rigid rotators. The adsorption and desorption phenomena are simulated by a kinetic model which includes the classical Langmuir description as a limit case and leads to an additional equation for the time evolution of the surface coverage to be solved along with the gas dynamics. Furthermore, the analytical solution is developed for free molecular flow regime. The comparison between the analytical solution and the results obtained by the numerical solution for this regime shows a very good agreement.

A Kinetic Model for Gas Adsorption-Desorption at Solid Surfaces Under Non-Equilibrium Conditions

Frezzotti, Aldo
2020-01-01

Abstract

One-dimensional flows of a polyatomic gas in the presence of an adsorbing-desorbing surface kept at constant and uniform temperature are simulated by numerically solving the Boltzmann kinetic equation by the Direct Simulation Monte Carlo (DSMC) method. It is considered the flow of gas between two planar and infinite surfaces, where only one surface is able to adsorb and desorb molecules, while the other one is impermeable. Borgnakke-Larsen model is used to describe inelastic collisions dynamics for a gas of rigid rotators. The adsorption and desorption phenomena are simulated by a kinetic model which includes the classical Langmuir description as a limit case and leads to an additional equation for the time evolution of the surface coverage to be solved along with the gas dynamics. Furthermore, the analytical solution is developed for free molecular flow regime. The comparison between the analytical solution and the results obtained by the numerical solution for this regime shows a very good agreement.
2020
File in questo prodotto:
File Dimensione Formato  
BRANR01-20.pdf

Accesso riservato

Descrizione: Paper
: Publisher’s version
Dimensione 2.43 MB
Formato Adobe PDF
2.43 MB Adobe PDF   Visualizza/Apri
BRANR_OA_01-20.pdf

Open Access dal 17/01/2022

Descrizione: Paper Open Access
: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 2.65 MB
Formato Adobe PDF
2.65 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1129375
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 20
  • ???jsp.display-item.citation.isi??? 13
social impact