Formation and evolution characteristics of hydrothermal flames inside a transpiring wall reactor: A transient numerical investigation

Zhaojian Liang, Fengming Zhang, Mengying Li, Chunyuan Ma

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

Transpiring-wall reactors with hydrothermal flames are effective in preventing corrosion and salt deposition in supercritical water oxidation systems. To uncover the not-well-understood evolution characteristics of the hydrothermal flame surrounded by a transpiring water film, a 2-D unsteady simulation is firstly conducted in this study. The transient results show that the variations of flow fields and flame shapes are attributed to the competition between inertial forces and buoyant forces. And the quasi-steady results present that high feed concentration may damage transpiring wall and delay the evolution of hydrothermal flames. In addition, a low feed temperature or a big flow area of jet can lead to open hydrothermal flames, which adversely affect the reactor. Furthermore, Froude Number, Fr, shows effectiveness in predicting quasi-steady flame shapes. For large-Fr conditions, the inertial force outweighs the buoyant force and hence closed flames are developed; while for low-Fr cases, open flames are developed.

Original languageEnglish
Article number105692
JournalJournal of Supercritical Fluids
Volume188
DOIs
Publication statusPublished - Sept 2022

Keywords

  • Hydrothermal flame
  • Negative buoyant jet
  • Supercritical water oxidation
  • Transient simulation
  • Transpiring wall reactor

ASJC Scopus subject areas

  • General Chemical Engineering
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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