This class implements transport coefficient corrections appropriate for porous media with a dispersed phase. More...

#include <Tortuosity.h>

Inheritance diagram for TortuosityMaxwell:

Collaboration diagram for TortuosityMaxwell:

Public Member Functions
	TortuosityMaxwell (double relativeConductivites=0.0)
	Default constructor uses Bruggeman exponent of 1.5. More...

double	tortuosityFactor (double porosity)
	The tortuosity factor models the effective increase in the diffusive transport length. More...

double	McMillan (double porosity)
	The McMillan number is the ratio of the flux-like variable to the value it would have without porous flow. More...

Public Member Functions inherited from Tortuosity
	Tortuosity (double setPower=1.5)
	Default constructor uses Bruggeman exponent of 1.5. More...

Protected Attributes
double	relativeConductivites_
	Relative conductivities of the dispersed and continuous phases, `relativeConductivites_` \( = \kappa_d / \kappa_0 \). More...

Protected Attributes inherited from Tortuosity
double	expBrug_
	Bruggeman exponent: power to which the tortuosity depends on the volume fraction. More...

Detailed Description

This class implements transport coefficient corrections appropriate for porous media with a dispersed phase.

This model goes back to Maxwell. The formula for the conductivity is expressed in terms of the volume fraction of the continuous phase, \( \phi \), and the relative conductivities of the dispersed and continuous phases, \( r = \kappa_d / \kappa_0 \). For dilute particle suspensions the effective conductivity is

\[ \kappa / \kappa_0 = 1 + 3 ( 1 - \phi ) ( r - 1 ) / ( r + 2 ) + O(\phi^2) \]

Attention: This class currently does not have any test cases or examples. Its implementation may be incomplete, and future changes to Cantera may unexpectedly cause this class to stop working. If you use this class, please consider contributing examples or test cases. In the absence of new tests or examples, this class may be deprecated and removed in a future version of Cantera. See https://github.com/Cantera/cantera/issues/267 for additional information.

Definition at line 148 of file Tortuosity.h.

Constructor & Destructor Documentation

◆ TortuosityMaxwell()

TortuosityMaxwell ( double relativeConductivites = 0.0 )

inline

Default constructor uses Bruggeman exponent of 1.5.

Definition at line 152 of file Tortuosity.h.

Member Function Documentation

◆ tortuosityFactor()

double tortuosityFactor ( double porosity )

inlinevirtual

The tortuosity factor models the effective increase in the diffusive transport length.

This method returns \( 1/\tau^2 \) in the description of the flux \( \phi C_T D_i \nabla X_i / \tau^2 \).

Reimplemented from Tortuosity.

Definition at line 155 of file Tortuosity.h.

References TortuosityMaxwell::McMillan().

◆ McMillan()

double McMillan ( double porosity )

inlinevirtual

The McMillan number is the ratio of the flux-like variable to the value it would have without porous flow.

The McMillan number combines the effect of tortuosity and volume fraction of the transported phase. The net flux observed is then the product of the McMillan number and the non-porous transport rate. For a conductivity in a non-porous media, \( \kappa_0 \), the conductivity in the porous media would be \( \kappa = (\rm McMillan) \kappa_0 \).

Reimplemented from Tortuosity.

Definition at line 159 of file Tortuosity.h.

References TortuosityMaxwell::relativeConductivites_.

Referenced by TortuosityMaxwell::tortuosityFactor().