Methane scattering on porous kerogen surfaces and its impact on mesopore transport in shale

Chen, Yichong; Li, Jun; Datta, Saikat; Docherty, Stephanie Y.; Gibelli, Livio; Borg, Matthew K.

doi:10.1016/j.fuel.2022.123259

Cited by 9 publications

(8 citation statements)

References 63 publications

(102 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This condition is particularly valid for steady flow problems and is met in many situations of practical importance, including the scattering from porous organic kerogen surfaces (Chen et al. 2022).…”

Section: Scattering Kernels and Their Accommodation Coefficientsmentioning

confidence: 99%

“…In (3.1), the function represents the probability that a molecule striking the surface behaves as an adsorbed molecule in the tangential component, and it is anticipated to be an increasing function of the reduced bulk number density , where is the bulk number density, is the diameter of a gas molecule; the function has a similar meaning, although for the normal component, but must be treated separately because the tangential component is known to exhibit a faster accommodation rate to the state of the surface than the normal one (Cercignani 1988; Chen et al. 2022).…”

Section: A New Scattering Dynamics Model: Incorporating Adsorptionmentioning

confidence: 99%

“…Here, two temperatures are considered: 300 K, for typical room temperature of MEMS devices, and 423 K, which we considered in an earlier scattering study (Chen et al. 2022) and is used here as a test of an elevated temperature condition on our scattering model. Each parallel wall has an outer edge of rigid wall molecules, which prevents any movement of the wall.…”

Section: Modelling the Scattering Using Molecular Dynamicsmentioning

confidence: 99%

“…Further details of the technique for measuring molecule scattering information can be found from Chen et al. (2022).

Figure 2.Scattering process of argon molecules on a platinum surface at 423 K. ( a ) Probability histogram of the number of collisions, with the inset indicating the tracking of the scattering process.…”

Section: Modelling the Scattering Using Molecular Dynamicsmentioning

confidence: 99%

“…If the gas-surface interactions are dominated by physical van der Waals forces only, the adsorption time interval τ and the re-emission displacement are typically much smaller than the characteristic time and length scales of the interactions between fluid molecules, and the SK simplifies to R(ξ → ξ ). This condition is particularly valid for steady flow problems and is met in many situations of practical importance, including the scattering from porous organic kerogen surfaces (Chen et al 2022).…”

Section: Scattering Kernels and Their Accommodation Coefficientsmentioning

confidence: 99%

See 4 more Smart Citations

Impact of surface physisorption on gas scattering dynamics

Chen¹,

Gibelli²,

Li³

et al. 2023

J. Fluid Mech.

Self Cite

View full text Add to dashboard Cite

Engineering flow systems operating under low pressures and/or at the micro/nano scale generally include a physically adsorbed gas layer next to the surface. In this paper, we develop a scattering kernel that accounts for the effect of adsorption, arising from van der Waals interactions, on the dynamics of molecules impinging on solid smooth surfaces. In the limit of low bulk density, surface adsorption becomes negligible and the scattering kernel recovers consistently the Cercignani–Lampis model, which best describes molecular collisions with a clean, smooth surface. In the limit of high bulk density, a dense adsorbed molecular layer forms next to the surface and its presence is picked up by the Maxwell model with complete diffuse reflection, which better captures the multiple collisions suffered by molecules. A weight coefficient based on the Langmuir adsorption isotherm is incorporated into the modelling to handle the transition between these two limiting conditions of low and high densities. The proposed model is validated against high-fidelity molecular dynamics simulations that are performed for a variety of gas–surface combinations and adsorbed molecular layers with different densities. It is shown that the proposed model very well captures the scattering patterns of beams of gas molecules at different velocities impinging on surfaces, as well as momentum and energy accommodation coefficients in the entire range of explored conditions.

show abstract

Section: Scattering Kernels and Their Accommodation Coefficientsmentioning

confidence: 99%