Unifying diffusion and seepage for nonlinear gas transport in multiscale porous media

Hongqing Song, Yuhe Wang, Jiulong Wang, Zhengyi Li

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We unify the diffusion and seepage process for nonlinear gas transport in multiscale porous media via a proposed new general transport equation. A coherent theoretical derivation indicates the wall-molecule and molecule-molecule collisions drive the Knudsen and collective diffusive fluxes, and constitute the system pressure across the porous media. A new terminology, nominal diffusion coefficient can summarize Knudsen and collective diffusion coefficients. Physical and numerical experiments show the support of the new formulation and provide approaches to obtain the diffusion coefficient and permeability simultaneously. This work has important implication for natural gas extraction and greenhouse gases sequestration in geological formations.

Original languageEnglish
Pages (from-to)246-250
Number of pages5
JournalChemical Physics Letters
Volume661
DOIs
Publication statusPublished - 16 Sep 2016

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Keywords

  • Advection
  • Collective diffusion
  • Darcy's law
  • Knudsen diffusion
  • Nanopore

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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