Steady State Diffusion Flame Structure with Lewis Number Variations

C. K. Law, S. H. Chung

Research output: Contribution to journalArticlepeer-review

76 Scopus citations


The effects of non-unity Lewis numbers of fuel and oxidizer on the structure of diffusion flames are studied for a variety of flow configurations. By using a generalized formation for the three-dimensional flame-sheet combustion, it is shown that the flame-sheet temperature is increased/decreased with decreasing/increasing Lewis number of either reactant, and that blowing reduces/aggravates these non-unity Lewis number effects if it is parallel/opposing the direction of diffusion. Ignition and extinction analyses are also conducted, yielding explicit criteria governing the occurrence of these events. The falsification of empirically-determined activation energy with the unity Lewis number assumption is emphasized.

Original languageEnglish (US)
Pages (from-to)129-145
Number of pages17
JournalCombustion science and technology
Issue number3-6
StatePublished - Dec 1 1982
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • General Physics and Astronomy


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