# Transport Properties¶

class cantera.Transport(infile='', phaseid='')

Bases: cantera._cantera._SolutionBase

Transport(*args, **kwargs)

This class is used to compute transport properties for a phase of matter.

Not all transport properties are implemented in all transport models.

binary_diff_coeffs

Binary diffusion coefficients [m^2/s].

electrical_conductivity

Electrical conductivity. [S/m].

mix_diff_coeffs

Mixture-averaged diffusion coefficients [m^2/s] relating the mass-averaged diffusive fluxes (with respect to the mass averaged velocity) to gradients in the species mole fractions.

mix_diff_coeffs_mass

Mixture-averaged diffusion coefficients [m^2/s] relating the diffusive mass fluxes to gradients in the species mass fractions.

mix_diff_coeffs_mole

Mixture-averaged diffusion coefficients [m^2/s] relating the molar diffusive fluxes to gradients in the species mole fractions.

multi_diff_coeffs

Multicomponent diffusion coefficients [m^2/s].

thermal_conductivity

Thermal conductivity. [W/m/K].

thermal_diff_coeffs

Return a one-dimensional array of the species thermal diffusion coefficients [kg/m/s].

transport_model

Get/Set the transport model associated with this transport model.

Setting a new transport model deletes the underlying C++ Transport object and replaces it with a new one implementing the specified model.

viscosity

Viscosity [Pa-s].

class cantera.DustyGasTransport(infile='', phaseid='')

Bases: cantera._cantera.Transport

DustyGasTransport(*args, **kwargs)

Implements the “dusty gas” model for transport in porous media.

As implemented here, only species transport (multi_diff_coeffs) is handled. The viscosity, thermal conductivity, and thermal diffusion coefficients are not implemented.

mean_particle_diameter

Mean particle diameter of the porous medium [m].

mean_pore_radius

Mean pore radius of the porous medium [m].

molar_fluxes(self, T1, T2, rho1, rho2, Y1, Y2, delta)

Get the molar fluxes [kmol/m^2/s], given the thermodynamic state at two nearby points.

Parameters: T1 – Temperature [K] at the first point T2 – Temperature [K] at the second point rho1 – Density [kg/m^3] at the first point rho2 – Density [kg/m^3] at the second point Y1 – Array of mass fractions at the first point. Length n_species. Y2 – Array of mass fractions at the second point. Length n_species. delta – Distance [m] between the two points.
permeability

Permeability of the porous medium [m^2].

porosity

Porosity of the porous medium [dimensionless].

tortuosity

Tortuosity of the porous medium [dimensionless].

## Species Transport Properties¶

class cantera.GasTransportData(geometry='', diameter=-1, well_depth=-1, dipole=0.0, polarizability=0.0, rotational_relaxation=0.0, acentric_factor=0.0)

Bases: object

Transport data for a single gas-phase species which can be used in mixture-averaged or multicomponent transport models.

The arguments passed to the constructor are equivalent to the properties of the object, with values in MKS units. To set properties in non-MKS units, use the set_customary_units method.

acentric_factor

Get/Set Pitzer’s acentric factor. [dimensionless]

diameter

Get/Set the Lennard-Jones collision diameter [m]

dipole

Get/Set the permanent dipole moment of the molecule [Coulomb-m].

geometry

Get/Set the string specifying the molecular geometry. One of atom, linear, or nonlinear.

polarizability

Get/Set the polarizability of the molecule [m^3].

rotational_relaxation

Get/Set the rotational relaxation number (the number of collisions it takes to equilibrate the rotational degrees of freedom with the temperature).

set_customary_units(self, geometry, diameter, well_depth, dipole=0.0, polarizability=0.0, rotational_relaxation=0.0, acentric_factor=0.0)

Set the parameters using “customary” units: diameter in Angstroms, well depth in Kelvin, dipole in Debye, and polarizability in Angstroms^3. These are the units used in in CK-style input files.

well_depth

Get/Set the Lennard-Jones well depth [J]