Numerical experiments in multiple Representative Elementary Volumes (REVs) were conducted to calculate macroscopic parameters for porous media models. The simulation of a microscopic flow that develops through a porous medium of 75% porosity formed by staggered square cylinders is presented to that purpose. A laminar steady flow regime (1 < Re < 150) is considered together with Péclet numbers in the 10–103 range. In particular, the interfacial heat transfer coefficient hsf, and the streamwise thermal dispersion coefficient kD−xx, are computed employing a double average over numerical results. The advantage of using a double average in multiple REVs is discussed comparing calculated parameters with those computed in single periodic REVs. The macroscopic porous media model is shown to be in excellent agreement with results obtained averaging microscopic numerical results for Péclet numbers in the 102–103 range.

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