Figure 4.

Permeability calculated for Eq. (7) of the present model (solid red line), for Cercignani’s solution of Boltzmann equation (solid blue line), for Arkilic model from Eq. (5) (dashed black line), and experimental data at $\Delta P$ =15 psi (black dots) as a function of the rarefaction parameter $\delta$=1/Kn.