Considering the range of permeabilities examined in this study this is an excellent result.
In simple cases where the solid medium is homogenous and isotropic with respect to permeability, the use of a shape factor determined from Eqn 12 could be used as an alternative to the finite element modelling of the process to determine intrinsic permeabilities to within an accuracy of a few per cent.
In general, the range of permeabilities that can be measured using this technique is unlikely to extend much beyond the range exhibited by the soils employed in this study.
Intrinsic permeabilities and saturated hydraulic conductivities obtained for 5 soil samples Soil type Intrinsic permeability ([K.
The conductivity (or permeability) is calculated using the permeabilities of the two phases, the volume fraction of the phases, and the aspect ratio of the ellipsoids.
As seen in Eq 2a, this model predicts the permeability of a blend by a weighted average of the permeabilities of the two phases.
As expected, the permeabilities of both PET/EVOH and PEN/EVOH decrease as the EVOH weight fraction is increased (Figs.
The permeabilities of both PET and PET/15% EVOH decrease as the draw temperature is decreased.
The different theoretical curves have been generated using the measured permeabilities of the component neat polymers and assuming different values of the L/W ratio from 1 to 100.