Comment on "Frequency-dependent dispersion in porous media" - Archive ouverte HAL Access content directly
Journal Articles Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Year : 2012

Comment on "Frequency-dependent dispersion in porous media"

Yohan Davit

Abstract

In a recent paper, Valdès-Parada and Alvarez-Ramirez [ Phys. Rev. E 84 031201 (2011)] used the technique of volume averaging to derive a "frequency-dependent" dispersion tensor, Dγ*, the goal of which is to describe solute transport in porous media undergoing periodic processes. We describe two issues related to this dispersion tensor. First, we demonstrate that the definition of Dγ* is erroneous and derive a corrected version, Dγ*c. With this modification, the approach of Valdès-Parada and Alvarez-Ramirez becomes strictly equivalent to the one devised by Moyne [ Adv. Water Res. 20 63 (1997)]. Second, we show that the term "frequency-dependent dispersion" is misleading because Dγ* and Dγ*c do not depend on the process operating frequency, χ. The study carried out by Valdès-Parada and Alvarez-Ramirez represents a spectral analysis of the relaxation of Dγ* towards its steady-state, independent of any periodic operation or excitation.
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Dates and versions

hal-00815751 , version 1 (19-04-2013)

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Yohan Davit, Michel Quintard. Comment on "Frequency-dependent dispersion in porous media". Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2012, vol. 86, pp. 013201-1. ⟨10.1103/PhysRevE.86.013201⟩. ⟨hal-00815751⟩
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