Fig. 1. Gas flow inside channel with Maxwell diffuse reflection boundary to study the confinement effect and dense gas effect, R = H/σ is the confinement ratio, H is the channel height, σ = 3.4 Å is the size of gas molecule, η_0 = n_0πσ^3/6 is the reduced number density.
Fig. 2. Profiles of (a), (b), (c) normalized reduced density (top) and (d), (e), (f) normalised velocity (bottom) for gas flow with η_0 = 0.01, 0.1, 0.3 (corresponding to p_0 = 2.0, 30.2, 231.0 MPa) (columns: left to right) in the channel of R = 10. The comparison shows good agreement of the Enskog equation with the two MD methods.
Fig. 3. The comparison shows good agreement between the Enskog equation and the two MD methods at different Knudsen number Kn and confinement ratio R, and also shows that three of them approach the Boltamann equation when R > 20 (H >7 nm).
Additional comparison with the DSBGK method and two experimental data without the confinement effect.