Gas-phase transient diffusion in droplet vaporization and combustion

Moshe Matalon, Chung K. Law

Research output: Contribution to journalArticle

Abstract

By suppressing the relaxation process of fuel vapor accumulation through the use of d2-law results as the initial conditions, the present study isolates gas-phase transient diffusion as the only transient process during droplet vaporization and combustion, and thereby successfully identifies its influence on the bulk droplet gasification characteristics. The case of pure vaporization and flame sheet combustion are analytically solved using perturbation methods and the matched asymptotic expasion technique in the limit of the small gas-to-liquid density ratio. Results demonstrate that transient diffusion enhances the vaporization and burning rates, reduces the flame front standoff ratio, and elevates the flame temperature. However, contrary to predictions of previous studies which have inadvertently included fuel vapor accumulation, these transient diffusion effects are very small so that gas-phase quasi steadiness is indeed an adequate and useful assumption for the modeling of subcritical droplet combustion.

Original languageEnglish (US)
Pages (from-to)219-229
Number of pages11
JournalCombustion and Flame
Volume50
Issue numberC
DOIs
StatePublished - 1983
Externally publishedYes

Fingerprint

Vaporization
Gases
vapor phases
vapors
burning rate
flame temperature
gasification
Vapors
flame propagation
Density of liquids
flames
Relaxation processes
Gasification
perturbation
liquids
predictions
gases
Temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Cite this

Gas-phase transient diffusion in droplet vaporization and combustion. / Matalon, Moshe; Law, Chung K.

In: Combustion and Flame, Vol. 50, No. C, 1983, p. 219-229.

Research output: Contribution to journalArticle

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