Apparent porous media gas dispersion in response to rapid pressure fluctuations

Tjalfe G. Poulsen*, Prabhakar Sharma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The impact of rapid pressure fluctuations (frequency >0.02 min -1) on gas transport in two filter sands with different gas permeability (kg) was investigated. Pressure fluctuation-induced gas transport characterized as a dispersion process governed by a pressure fluctuation-induced dispersion coefficient (Dp) was measured using a column containing the sand, connected to a membrane pump for generating pressure fluctuations. Measurements of Dp in both sands were carried out for different combinations of pressure-fluctuation amplitude (A) and frequency (f). To assess if Dp is affected by the presence of a background steady gas flux in addition to the gas movement induced by the pressure fluctuations, Dp measurements were carried out for different constant pore gas velocities (u). Measurements of Dp corresponding to a total of 102 combinations of u, A, f, and kg were carried out. The results showed that the value of Dp increases with increasing A, f, and kg but is independent of u. Relations between Dp and A, f, and kg were generally strong.

Original languageEnglish
Pages (from-to)635-641
Number of pages7
JournalSoil Science
Issue number12
StatePublished - Dec 2011
Externally publishedYes


  • Fluctuation amplitude
  • Fluctuation frequency
  • Gas dispersion
  • Gas permeability
  • Rapid pressure fluctuations


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