AC Diffusion: Transport in Porous Networks Subjected to Zero-Time-Average Advective Flow

J. J. Claria, G. H. Goldsztein, Juan Carlos Santamarina

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Diffusion is a slow transport mechanism and advective transport tends to dominate in large-size systems. An alternative transport mechanism is explored herein, whereby zero time-average cyclic fluid flow is compounded with pore-scale mixing to render effective transport. Two one-dimensional cyclic flow cases are analyzed: a rigid porous network with two open boundaries subjected to cyclic flow through, and a compressible porous network with only one open boundary subjected to cyclic compression. The corresponding analytical models predict diffusion-like macroscale response and provide explicit expressions for the effective diffusion coefficients in terms of the microstructure of the porous medium and flow conditions. A parallel experimental study is conducted to corroborate analytical predictions. Results confirm the relevance of pore-scale mixing in cyclic flow as a transport mechanism in porous networks.

Original languageEnglish (US)
Pages (from-to)51-61
Number of pages11
JournalTransport in Porous Media
Volume93
Issue number1
DOIs
StatePublished - May 1 2012

Keywords

  • Dispersion
  • Porous media
  • Solute
  • Transport

ASJC Scopus subject areas

  • Catalysis
  • Chemical Engineering(all)

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