Nonpremixed ignition of C7-C16 normal alkanes in stagnating liquid pool

Wei Liu, Jeremy A. Koch, Chung K. Law

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The nonpremixed ignition temperatures of n-decane, n-dodecane, and n-hexadecane were measured in a liquid pool by heated stagnating oxidizing flow at atmospheric pressure. Together with previous results on n-heptane, it is shown that, for the C7-C16 n-alkanes, the nonpremixed ignition temperature increases monotonically with increasing carbon number, and as such is contrary to the behavior of homogeneous ignition delays. Numerical simulation of the ignition events for n-heptane, n-decane and n-dodecane, employing a recently developed high temperature kinetic model, showed good agreement with the experimental results both qualitatively and quantitatively. Sensitivity and computational analyses indicate that the reason for the higher ignition temperature with increasing fuel molecular size is mostly due to their progressively reduced diffusivity, which leads to correspondingly reduced fuel concentration in the ignition kernel.

Original languageEnglish (US)
Pages (from-to)2145-2148
Number of pages4
JournalCombustion and Flame
Issue number11
StatePublished - Nov 2011

All Science Journal Classification (ASJC) codes

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


  • N-alkanes
  • Nonpremixed ignition
  • Stagnation flow


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