por_ceramics 0.18 "Porosity, ceramics"
por_carbon 0.45 "Porosity, activated carbon"
por_fracture 0.7 "Porosity, fracture"
df 0.2[mm] "Fracture aperture"
dp_carbon 20[um] "Granular carbon diameter"
kappa_ceramics 0.8e-11[m^2] "Permeability ceramics"
p_in 6[psi] "Inlet pressure"