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The Influence of Droplet Evaporation on the Fuel-Air Mixing Rate in a Burner

Komiyama, K. and Flagan, R. C. and Heywood, J. B. (1977) The Influence of Droplet Evaporation on the Fuel-Air Mixing Rate in a Burner. Symposium (International) on Combustion, 16 (1). pp. 549-560. ISSN 0082-0784. doi:10.1016/S0082-0784(77)80351-2.

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The importance of droplet evaporation in the overall fuel-air mixing process in liquid fuel spray flames is examined with a series of experiments in a simple atmospheric pressure burner burning a range of hydrocarbon fuels. Two types of fuel atomizers were studied—air-assist and pressure jet—which have substantially different operating characteristics. Fuel-air mixing rates were determined from time-average oxygen concentrations measured with overall burner operation stoichiometric. It is shown that with air-assist atomizers, the kinetic energy of the atomizer jet determines the mixing rate intensity for both liquid and gaseous fuels. Since the droplet evaporation time is much less than the mixing time, the details of the evaporation process are not important and the jet length scale and kinetic energy govern the mixing process. With pressure jet atomizers, the characteristic evaporation and mixing times are comparable. The evaporating fuel drops create fuel vapor concentration nonuniformities on a scale much smaller than the fuel jet scale. Mixing rate intensities comparable to those obtained with air-assist atomizers can, therefore, be achieved with much lower turbulent kinetic energy dissipation rates. With pressure jet atomizers, both the kinetic energy of the fuel jet and the evaporation characteristics of the fuel droplets control the initial fuel-air mixing rate.

Item Type:Article
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Flagan, R. C.0000-0001-5690-770X
Additional Information:© 1979 Combustion Institute. This work has been supported in part by the Environmental Protection Agency under Grant No. R-800729-02-0, by the Energy Research and Development Administration under Grant No. E (11-1)-2680, and by the National Aeronautics and Space Administration under Grant No. NGR 22-009-378. The assistance of Monima Briggs and David Bigio is gratefully acknowledged.
Funding AgencyGrant Number
Environmental Protection Agency (EPA)R-800729-02-0
Energy Research and Development Administration (ERDA)E (11-1)-2680
NASANGR 22-009-378
Issue or Number:1
Record Number:CaltechAUTHORS:20150911-141607504
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Official Citation:K. Komiyama, R.C. Flagan, J.B. Heywood, The influence of droplet evaporation on fuel-air mixing rate in a burner, Symposium (International) on Combustion, Volume 16, Issue 1, 1977, Pages 549-560, ISSN 0082-0784, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60199
Deposited By: Donna Wrublewski
Deposited On:11 Sep 2015 22:21
Last Modified:10 Nov 2021 22:31

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