Tomographic analysis of reactive flow induced pore structure changes in column experiments

Rong Cai, W. Brent Lindquist, Wooyong Um, Keith W. Jones

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

We utilize synchrotron X-ray computed micro-tomography to capture and quantify snapshots in time of dissolution and secondary precipitation in the microstructure of Hanford sediments exposed to simulated caustic waste in flow-column experiments. The experiment is complicated somewhat as logistics dictated that the column spent significant amounts of time in a sealed state (acting as a batch reactor). Changes accompanying a net reduction in porosity of 4% were quantified including: (1) a 25% net decrease in pores resulting from a 38% loss in the number of pores < 10- 4 mm3 in volume and a 13% increase in the number of pores of larger size; and (2) a 38% decrease in the number of throats. The loss of throats resulted in decreased coordination number for pores of all sizes and significant reduction in the number of pore pathways.

Original languageEnglish
Pages (from-to)1396-1403
Number of pages8
JournalAdvances in Water Resources
Volume32
Issue number9
DOIs
StatePublished - Sep 2009

Keywords

  • Flow-column experiments
  • Reactive flow
  • X-ray computed micro-tomography

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