Immiscible fluids

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review


Immiscible fluids are ubiquitous in the subsurface, occurring naturally (air and water in the vadose zone) or because of human activity [non-aqueous phase liquids (NAPLs)]. The chapter gives an overview of the dominant physical and chemical processes that govern the fate and transport of air, water, NAPL, and NAPL components, in soil. The vertical distribution of air, water, and NAPL at equilibrium is explained. Laboratory measurements of relative permeabilities of water-wet sandstones from two studies are presented, and salient features identified. The simplest models used to describe the mass transfer of NAPL components in soil between aqueous, gaseous, and solid phases are described.
Original languageEnglish
Title of host publicationEncyclopedia of Soils in the Environment
EditorsMicheal J Gross, Margaret A Oliver
ISBN (Print)9780123485304
Publication statusE-pub ahead of print - 26 Aug 2022


  • Adsorption
  • Capillary Pressure
  • Darcy's Law
  • Dissolution
  • Henry's Law
  • Non-aqueous phase liquids (NAPLs)
  • partitioning coefficient
  • Raoult's law
  • Relative permeability
  • Representative elementary volume (REV)
  • Saturation
  • Solubility
  • Sorption
  • spatial averaging
  • Volatilization


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