Numerical simulation on soot deposition process in laminar ethylene diffusion flames under a microgravity condition

Jae Hyuk Choi, Junhong Kim, Sangkyu Choi, Byoung Ho Jeon, Osamu Fujita, Suk Ho Chung

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A numerical study on soot deposition in ethylene diffusion flames has been conducted to elucidate the effect of thermophoresis on soot particles under a microgravity environment. Time-dependent reactive-flow Navier-Stokes equations coupled with the modeling of soot formation have been solved. The model was validated by comparing the simulation results with the previous experimental data for a laminar diffusion flame of ethylene (C2H4) with enriched oxygen (35% O2 + 65% N2) along a solid wall. In particular, the effect of surrounding air velocity as a major calculation parameter has been investigated. Especially, the soot deposition length defined as the transverse travel distance to the wall in the streamwise direction is introduced as a parameter to evaluate the soot deposition tendency on the wall. The calculation result exhibits that there existed an optimal air velocity for the early deposition of soot on the surface, which was in good agreement with the previous experimental results. The reason has been attributed to the balance between the effects of the thermophoretic force and convective motion.

Original languageEnglish (US)
Pages (from-to)707-716
Number of pages10
JournalJournal of Mechanical Science and Technology
Volume23
Issue number3
DOIs
StatePublished - Jun 1 2009

Keywords

  • Diffusion flame
  • Microgravity
  • Soot deposition length
  • Thermophoresis

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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