Effect of droplet interaction on ignition in monodispersed droplet streams

Sangiovanni, J.J.; Kesten, A. S.

doi:10.1016/s0082-0784(77)80354-8

Cited by 31 publications

(11 citation statements)

References 2 publications

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“…There have been many studies of droplet stream flames as prototypical of systems in which droplets interact during combustion. Often the flame is burning in the hot effluent of a flat flame burner (e.g., Sangiovanni and Kesten, 1977;Sangiovanni and Dodge, 1978), but there are also some ambient droplet stream flame studies (e.g., Nuruzzaman, et al, 1971;Silverman and Dunn-Rankin, 1994). All of the experimental and analytical evidence indicates that the vaporization rate in droplet stream flames is much lower than would be Downloaded by [Florida State University] wave in the lube.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Acoustically Driven Extinction in a Droplet Stream Flame

McKINNEY

Dunn‐Rankin

2000

Combustion Science and Technology

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Acoustic fields interacting witha rectilinear droplet stream flame can increase mixing between fuel and oxidizer. Fora droplet stream burning in roomtemperature air, sufficiently high acoustic intensity levels can cause local flame extinction. The sound pressure levels required to extinguish the flame increase with increasing sound frequency, The key parameter associated withflame quench is the gas displacement produced by the sound field. Quenching occurs when the acoustic displacement distance is approximately the radius of the droplets fueling the droplet stream flame.

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Section: Experimental Apparatusmentioning

confidence: 99%

Acoustically Driven Extinction in a Droplet Stream Flame

McKINNEY

Dunn‐Rankin

2000

Combustion Science and Technology

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“…This kind of droplet stream is therefore an interesting tool for investigating droplet-to-droplet interactions and it has already been used in previous numerical and experimental studies. Sangiovanni and Kesten [8] were perhaps the first to investigate the effects of droplet interaction on the ignition time for droplet streams injected into a hot gas environment. They noticed that a closer spacing of the droplets enhances the strength of the heat and mass diffusion from the flame region.…”

Section: Introductionmentioning

confidence: 99%

Monodisperse droplet heating and evaporation: Experimental study and modelling

Maqua

Castanet

Grisch

et al. 2008

International Journal of Heat and Mass Transfer

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Results of experimental studies and the modelling of heating and evaporation of monodisperse ethanol and acetone droplets in two regimes are presented. Firstly, pure heating and evaporation of droplets in a flow of air of prescribed temperature are considered. Secondly, droplet heating and evaporation in a flame produced by previously injected combusting droplets are studied. The phase Doppler anemometry technique is used for droplet velocity and size measurements. Two-colour laser induced fluorescence thermometry is used to estimate droplet temperatures. The experiments have been performed for various distances between droplets and various initial droplet radii and velocities. The experimental data have been compared with the results of modelling, based on given gas temperatures, measured by coherent anti-stokes Raman spectroscopy, and Nusselt and Sherwood numbers calculated using measured values of droplet relative velocities. When estimating the latter numbers the finite distance between droplets was taken into account. The model is based on the assumption that droplets are spherically symmetrical, but takes into account the radial distribution of temperature inside droplets. It is pointed out that for relatively small droplets (initial radii about 65 lm) the experimentally measured droplet temperatures are close to the predicted average droplet temperatures, while for larger droplets (initial radii about 120 lm) the experimentally measured droplet temperatures are close to the temperatures predicted at the centre of the droplets.

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“…Results of Sangiovanni and Kesten [22], for monodisperse streams of drops, suggested that interparticle effects are relatively small for the present spacings. Specific examination of present conditions indicated that reaction of the particle stream varied local reactant concentrations generally less than 1OZ; therefore, the test conditions are essentially representative of results for individual particles.…”

mentioning

confidence: 70%