Gas-phase transient diffusion in droplet ignition

B. H. Chao, M. Matalon, C. K. Law

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The existing droplet ignition criterion was obtained by examining the initiation of chemical reaction in the far field under the assumption of gas-phase quasi-steadiness. However, it is precisely in this far field where transient diffusion becomes important. In order to incorporate this effect in an ignition analysis, we consider the simultaneous limits of a small gas-to-liquid density ratio and a large activation energy of the chemical reaction. The ignition dynamics is thus investigated; in particular, ignition delay times and ignitability criteria are obtained. Comparison of the ignition Damköhler number obtained in the present study with that corresponding to the quasi-steady case shows that they may differ significantly, hence demonstrating the qualitative importance of transient diffusion in droplet ignition.

Original languageEnglish (US)
Pages (from-to)43-51
Number of pages9
JournalCombustion and Flame
Issue number1
StatePublished - Jan 1985
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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