Neutron radiography on tubular flow reactor for hydrothermal synthesis: In situ monitoring of mixing behavior of supercritical water and room-temperature water

Seiichi Takami, Kenichi Sugioka, Takao Tsukada, Tadafumi Adschiri, Katsumi Sugimoto, Nobuyuki Takenaka, Yasushi Saito

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Neutrons are effectively scattered by hydrogen atoms and have high permeability in heavier elements including Fe, Cr, and Ni. Therefore, neutron radiography should enable the detection of differences in water density in a stainless-steel reactor. To test this, we performed neutron radiography on a tubular flow reactor for supercritical hydrothermal synthesis and visualized the mixing behavior of supercritical water and room-temperature water at a T-junction. The results showed that the difference in density between supercritical water and room-temperature water, as well as how the density changed during mixing, was clearly visualized. The partitioned flow in the side tube was also visualized while feeding room-temperature water. The results indicated the importance of buoyancy forces, as discussed by others in previous reports.

Original languageEnglish
Pages (from-to)46-51
Number of pages6
JournalJournal of Supercritical Fluids
Volume63
DOIs
Publication statusPublished - 2012 Mar 1

Keywords

  • Hydrothermal synthesis
  • In situ monitoring
  • Mixing
  • Neutron radiography
  • Tubular flow reactor
  • Water density

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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