Abstract
The presented work addresses exclusively to the transport in the liquid (sub)phases occurring in porous media. By analysing the thermodynamics of the solid-liquid and liquid-gas interfaces present within a porous solid-liquid-gas system, it is shown that the forces acting on two distinct subphases of the liquid, due to the presence of a macroscopic temperature gradient, tend to balance each other. Exact counterbalance of the resulting fluxes implies that liquid flow in porous media under nonisothermal conditions is adequately described by the product of isothermal liquid diffusivity and the gradient of volumetric liquid content.
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