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Cp,g and Cp,l (SI unit: J/(kg·K)) the moist air and liquid water heat capacities at constant pressure.
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(ρCp)eff (SI unit: J/(m3·K)) the effective volumetric heat capacity at constant pressure defined by an averaging model to account for the solid matrix, the moist air, and the liquid water properties:
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q the conductive heat flux (SI unit: W/m2).
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ug (SI unit: m/s) the moist air velocity field, that should be interpreted as the Darcy velocity, that is, the volume flow rate per unit cross sectional area.
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ul (SI unit: m/s) the liquid water velocity field, that should be interpreted as the Darcy velocity, that is, the volume flow rate per unit cross sectional area.
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keff (SI unit: W/(m·K)) the effective thermal conductivity (a scalar or a tensor if the thermal conductivity is anisotropic), defined by an averaging model to account for solid matrix, the moist air, and the liquid water properties. See Moist Porous Medium for details about the available averaging models.
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Q (SI unit: W/m3), defined as the sum of the diffusive flux of enthalpy and of the liquid capillary flux:
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