chapman_enskog#

chapman_enskog(target, MA, MB, sigma_AB, omega_AB, temperature='pore.temperature', pressure='pore.pressure')[source]#

Calculate gas phase diffusion coefficient using Chapman-Enskog equation.

Parameters

  • target (OpenPNM Base object) – Object with which this model is associated. This controls the length of the calculated array, and also provides access to other necessary properties.

  • MA (scalar) – The molecular mass of species A and B in units of kg/mol

  • MB (scalar) – The molecular mass of species A and B in units of kg/mol

  • sigma_AB (scalar) – The collision diameter in units of Angstroms

  • omega_AB (scalar) – The collision integral

  • temperature (str) – Name of the dictionary key on target where the array containing temperature values is stored

  • pressure (str) – Name of the dictionary key on target where the array containing pressure values is stored

Returns

diffusivities – A numpy ndarray containing diffusion coefficient values [m2/s].

Return type

ndarray