Air-water interfacial area and capillary pressure: Porous-Medium texture effects and an empirical function

Sheng Peng, Mark L. Brusseau

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The relationship between air-water interfacial area and capillary pressure under higher water-content conditions is investigated for four natural porous media. The results show that the magnitude of the air-water interfacial area increases with increasing capillary pressure, consistent with the decrease in water saturation. The maximum observed air-water interfacial areas are dependent upon the magnitude of residual water saturation, which itself is condition-dependent. The more well-sorted porous-medium exhibited a greater rate of change of air-water interfacial area with capillary pressure than the more poorly sorted porous media. The observed relationship between air-water interfacial area and capillary pressure was quantified by coupling an empirical equation describing the air-water interfacial area versus water saturation relationship with the van Genuchten equation relating water saturation and capillary pressure. This equation produced reasonable simulations of the measured data.

Original languageEnglish (US)
Pages (from-to)829-832
Number of pages4
JournalJournal of Hydrologic Engineering
Volume17
Issue number7
DOIs
StatePublished - Dec 1 2012

Keywords

  • Interfacial
  • Soil water
  • Vadose zone

ASJC Scopus subject areas

  • Environmental Chemistry
  • Civil and Structural Engineering
  • Water Science and Technology
  • Environmental Science(all)

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