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. 2015 Apr 22;6:6949. doi: 10.1038/ncomms7949

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(a) Permeability η × K versus loading Γ , showing the breakdown of the hydrodynamic prediction for the permeance: methane (black), propane (blue), hexane (green), nonane (yellow) and dodecane (red). The viscosity is that of the bulk hydrocarbon at the corresponding pressure and temperature. Inset: Same plot with the bulk viscosity replaced by the bulk viscosity calculated at the relevant pore density, ρ_pores. For comparison, the dashed lines give the permeability of a cylindrical pore with diameter equal to the mean size of the matrix pore-size distribution. (b) Permeance master curve: K × (n+n₀) (with n₀=2) versus loading (same symbols as in a). This demonstrates that K∼1/n with n the alkane length. The dashed line is a guide to the eye.

Inline graphic — (a) Permeability η × K versus loading Γ , showing the breakdown of the hydrodynamic prediction for the permeance: methane (black), propane (blue), hexane (green), nonane (yellow) and dodecane (red). The viscosity is that of the bulk hydrocarbon at the corresponding pressure and temperature. Inset: Same plot with the bulk viscosity replaced by the bulk viscosity calculated at the relevant pore density, ρ_pores. For comparison, the dashed lines give the permeability of a cylindrical pore with diameter equal to the mean size of the matrix pore-size distribution. (b) Permeance master curve: K × (n+n₀) (with n₀=2) versus loading (same symbols as in a). This demonstrates that K∼1/n with n the alkane length. The dashed line is a guide to the eye.