Gas dispersion and immobile gas content in granular porous media: Effect of particle size nonuniformity

Prabhakar Sharma*, Tjalfe G. Poulsen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Gas dispersion is an important process often controlling gas transport in porous media. At present, however, relatively little is known about the relationship between gas dispersion and porous media physical properties. In this study, gas dispersion and mobile gas content in porous media were measured as a function of medium average particle diameter, particle size range, and pore gas velocity. A set of natural granular media consisting of sand and gravel with uniform particle size distributions covering average particle diameters from 0.5 to 14 mm was used. Clean sand and gravel were used to obtain media with specific particle size distributions via mechanical sieving. Gas dispersion and mobile gas content were measured by column tracer experiments using atmospheric air and nitrogen as tracer gases. Gas dispersion coefficients, gas dispersivities, and mobile gas contents were determined by fitting the advection-dispersion equation to the measured gas breakthrough curves. The results showed that gas dispersivity decreased with increasing mean particle diameter and increased with increasing particle size range (width of particle size distribution). Thus, the largest dispersivities were observed for media with a small mean particle diameter and a wide particle size distribution. A model concept for predicting gas dispersivity from mean particle diameter and particle size range was proposed. The mobile gas content increased with increasing pore gas velocity but was independent of either particle size range or mean particle diameter.

Original languageEnglish
Pages (from-to)426-431
Number of pages6
JournalSoil Science
Volume175
Issue number9
DOIs
StatePublished - Sep 2010
Externally publishedYes

Keywords

  • gas dispersion
  • gas flow velocity
  • Granular porous media
  • mobile gas content
  • particle diameter
  • particle size distribution

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