Determination of schmidt number of mixed fuels by the characteristics of laminar lifted jet flames

B. J. Lee*, S. H. Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


A method to determine the Schmidt number of fuel is proposed from the behavior of laminar lifted jet flames. Based on the observation of a laminar lifted flame edge, the flame stabilization point is located along the stoichiometric contour in the mixing layer of fuel and air in laminar jets, since a tribrachial (triple) flame structure exists which is composed of a diffusion flame, a rich premixed flame and a lean premixed flame, all extending from a single location. For the flame edge to be stationary, the axial velocity at the edge should balance with the propagation speed of the tribrachial flame. Since the region between the flame stabilization point and the nozzle exit can be treated as a cold jet, the jet theory of momentum and species can be applied to obtain the correlation of liftoff height with jet velocity and nozzle diameter of HL∝d2uo(2ScF-1)/(ScF-1). Using this relation, the mixture of fuels having Sc<1 and Sc>1 are tested. The dependence of liftoff height on jet velocity is curve-fitted to extract the effective Schmidt number of mixed fuels. Experimentally determined Schmidt numbers agree satisfactorily with the theoretical predictions from the kinetic theory.

Original languageEnglish (US)
Pages (from-to)68-74
Number of pages7
Issue number1
StatePublished - Jan 2006
Externally publishedYes


  • Lifted flame
  • Mixed fuel
  • Schmidt number

ASJC Scopus subject areas

  • General Chemical Engineering
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Organic Chemistry


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