Combustion of single droplets and droplet pairs in a vibrating field under microgravity

K. Okai, O. Moriue, M. Araki, M. Tsue, M. Kono, J. Sato, D. L. Dietrich, F. A. Williams

Research output: Contribution to journalConference article

20 Citations (Scopus)

Abstract

This paper presents results of an experimental investigation on acoustic effects on combustion of single droplets and droplet pairs in microgravity. The ambient gas was air at atmospheric temperature and pressure, with octane as the fuel. A loudspeaker at the bottom of the chamber produced the acoustic field. Experimental results of single droplets showed that at low frequency and small to moderate acoustic intensities the evaporation rate increases, and the burning rate constant is nearly proportional to the product of frequency, f, and square of displacement, X2a, fX2a. At higher acoustic intensities, the burning rate constant either remains constant or decreases, and, in some cases, flame extinction occurs at a finite droplet diameter. The burning rate constant for a droplet pair is consistently lower than that for a single droplet. At lower frequencies, the burning rate constant reaches a maximum at an intermediate acoustic intensity. At higher frequencies, the burning rate constant increases monotonically with increasing acoustic intensity. Theflame size decreases as a result of interactions, as does the critical spacing that indicates a merged flame around the droplet pair versus individual flames surrounding the droplets. The results also show that interactions stabilize the flame, in that droplet pairs burn to completion under conditions in which the flame surrounding a single droplet extinguishes at a finite droplet diameter.

Original languageEnglish
Pages (from-to)977-983
Number of pages7
JournalProceedings of the Combustion Institute
Volume28
Issue number1
DOIs
Publication statusPublished - Jan 1 2000
Externally publishedYes
Event30th International Symposium on Combustion - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004

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Microgravity
burning rate
microgravity
flames
acoustics
Acoustic intensity
Rate constants
low frequencies
atmospheric temperature
evaporation rate
loudspeakers
octanes
atmospheric pressure
extinction
chambers
spacing
interactions
Atmospheric temperature
Loudspeakers
Acoustic fields

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

Cite this

Combustion of single droplets and droplet pairs in a vibrating field under microgravity. / Okai, K.; Moriue, O.; Araki, M.; Tsue, M.; Kono, M.; Sato, J.; Dietrich, D. L.; Williams, F. A.

In: Proceedings of the Combustion Institute, Vol. 28, No. 1, 01.01.2000, p. 977-983.

Research output: Contribution to journalConference article

Okai, K. ; Moriue, O. ; Araki, M. ; Tsue, M. ; Kono, M. ; Sato, J. ; Dietrich, D. L. ; Williams, F. A. / Combustion of single droplets and droplet pairs in a vibrating field under microgravity. In: Proceedings of the Combustion Institute. 2000 ; Vol. 28, No. 1. pp. 977-983.
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