Laws for calculating effective heat conductivity coefficients. More...
In porous media, the effective heat conductivity depends on the solid-fluid conductivity ratio, the volume fractions of the constituent phases, and the geometry of the solid-fluid interface [5]. The following laws are implemented:
ThermalConductivityJohansen
[47] computes the thermal conductivity of dry and the wet soil material and interpolates using the Kersten number. The effective wet conductivity is based on a geometric average and the effective dry conductivity is based on a semi-emprical relation and fitted to medium quartz sand.
The effective thermal conductivity is given by
where
The Somerton method [81] computes the thermal conductivity of dry and the wet soil material. It uses a root function of the water saturation to compute the effective thermal conductivity for a two-phase fluidsystem. The individual thermal conductivities are calculated as geometric mean of the thermal conductivity of the porous material and of the respective fluid phase.
The effective thermal conductivity of ThermalConductivitySomertonTwoP
is given by
with
The Somerton method [81] computes the thermal conductivity of dry and the wet soil material. It is extended here to a three phase system of water (w), NAPL (n) and gas (g). It uses a root function of the water and NAPL saturation to compute the effective thermal conductivity for a three-phase fluidsystem. The individual thermal conductivities are calculated as geometric mean of the thermal conductivity of the porous material and of the respective fluid phase.
The effective thermal conductivity of ThermalConductivitySomertonThreeP
is given by
with
The effective thermal conductivity of ThermalConductivityAverage
is calculated as a weighted arithmetic average of the thermal conductivities of the solid and the fluid phases. The weights are determined by the volume fraction the phase occupies. Denoting the volume fractions by
summing over both fluid and solid phases. With the porosity
where
Files | |
file | johansen.hh |
Relation for the saturation-dependent effective thermal conductivity. | |
file | somerton.hh |
Effective thermal conductivity after Somerton. | |
file | thermalconductivitysomerton3p.hh |
Effective thermal conductivity after Somerton. | |
file | thermalconductivityaverage.hh |
Effective thermal conductivity based on weighted arithmetic average. | |
Classes | |
class | Dumux::ThermalConductivityJohansen< Scalar > |
Relation for the saturation-dependent effective thermal conductivity. More... | |
class | Dumux::ThermalConductivitySomertonTwoP< Scalar > |
Effective thermal conductivity after Somerton. More... | |
class | Dumux::ThermalConductivitySomertonThreeP< Scalar > |
Effective thermal conductivity after Somerton. More... | |
class | Dumux::ThermalConductivityAverage< Scalar > |
Effective thermal conductivity based on weighted arithmetic average. More... | |