Rarefied flow effects on stabilization and extinction of rotating-disk flame at low pressures

Peng Zhang, Chung K. Law

Research output: Contribution to journalArticle

Abstract

An activation energy asymptotic analysis with one-step overall reaction was performed for the stabilization and extinction of a premixed flame over a rotating disk at sufficiently low pressures, for its relevance in low-pressure CVD (chemical vapor deposition) operations in which the flow is weakly rarefied. Extinction criteria based on the critical Damköhler number were obtained through the S-curve concept, parametrically demonstrating the influence of the CVD operating conditions, such as the spin rate and temperature of the disk, on flame extinction. It is further shown that, while decreasing pressure and hence the reactivity of the mixture tends to extinguish the flame, the trend can be substantially weakened by taking into account of the influence of the Knudsen layer, which reduces the heat loss to the disk as well as the flow stretch rate at the flame.

Original languageEnglish (US)
Pages (from-to)475-481
Number of pages7
JournalInternational Journal of Heat and Mass Transfer
Volume53
Issue number1-3
DOIs
StatePublished - Jan 15 2010

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Keywords

  • Asymptotic analysis
  • Flame extinction
  • Rotating-disk flame
  • Weakly rarefied flow

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