A study of the effect of oxygen concentration on the soot deposition process in a diffusion flame along a solid wall by in-situ observations in microgravity

Jae Hyuk Choi*, Osamu Fujita, Takafumi Tsuiki, Junhong Kim, Suk Ho Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The effect of oxygen concentration on the soot deposition process from a diffusion flame to a solid wall was investigated in a microgravity environment to attain in-situ observations of the process. An ethylene (C2H4) diffusion flame was formed around a cylindrical rod burner in oxygen concentrations of O2 = 21, 35, and 50% with a surrounding air and wall temperatures of 300 K. Laser extinction was adopted to determine the soot volume fraction distribution between the flame and burner wall. The experimental results show that the soot particle distribution region moves closer to the surface of the wall and that more deposition occurs with increasing surrounding oxygen concentrations. The experiments determined the trace of the maximum soot concentration position, defined as the "soot line", and it was comparable to that established with numerical calculations. A numerical simulation was also performed to understand the motion of soot particles in the flame and the characteristics of the soot deposition to the wall. The results successfully predicted the differences in the motion of soot particles by different oxygen concentrations near the burner surface and are in good agreement with observed soot behavior, ie the "soot line", in microgravity. A comparison of the calculations and experimental results led to the conclusion that a consideration of the thermophoretic effect is essential to understand the soot deposition on walls.

Original languageEnglish (US)
Pages (from-to)839-848
Number of pages10
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Volume48
Issue number4
DOIs
StatePublished - May 15 2006

Keywords

  • Deposition
  • Diffusion flame
  • Microgravity
  • Soot
  • Soot line
  • Volume fraction

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

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