Theory of convective, transient, multicomponent droplet vaporization

Law, Chung K.; Prakash, Shiva; Sirignano, William A.

doi:10.1016/s0082-0784(77)80356-1

Cited by 38 publications

(23 citation statements)

References 11 publications

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“…In the liquid the more/less volatile compounds respectively diffuse outward/inward, although the net mass fluxes for all species are directed outward. The liquid boundary layer thicknesses for heat, mass, and momentum transport differ significantly from each other, enabling simplifications to be made in a more detailed modeling Profiles of x-velocity, concentration, and temperature for atm pheric air flowing over and reacting with a stagnant hexane-octane mixt(51,52) …”

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confidence: 99%

Transient Heating and Liquid-Phase Mass Diffusion in Fuel Droplet Vaporization

Sirignano

Law

1978

Evaporation—Combustion of Fuels

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Theoretical and experimental advances on the transient, convective, multicomponent droplet vaporization are reviewed, with particular emphasis on the internal heat, mass, and momentum transport processes and their effects on the bulk vaporization characteristics. Whereas these processes have only small quantitative effects on single--component droplet vaporization, they can modify qualitatively the vaporization behavior of a multicompoent droplet. Depending on the intensity of convective transport through internal circulation, liquid-phase mass diffusion or the volatility differentials among the various components can become the rate-limiting factor. The generation of internal circulation through the surface shear induced by external gas streams is discussed. Some potentially interesting and practically important research problems are identified. Tn many chemical power plants the fuel is introduced inthe form of a spray. The droplets subsequently vaporize as they are dispersed in the reactor. Frequently chemical reactions are initiated prior to the complete vaporization of the droplets, and the flame will then propagate through a mixture consisting of fuel vapor, fuel droplets, and other gaseous components, including the oxidizer. Both direct and indirect studies on the performance of various types of engines indicate that the resulting combustion characteristics depend significantly on the amount and the sizes of the fuel droplets that are present when active chemical reactions are initiated. Hence studies on spray vaporization and combustion are of 0-8412-0383-0/78/33-166-003$06.50/0

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confidence: 99%

Transient Heating and Liquid-Phase Mass Diffusion in Fuel Droplet Vaporization

Sirignano

Law

1978

Evaporation—Combustion of Fuels

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“…Although the importance of understanding the evaporation of MC-fuel drops has been recognized for more than 30 years, it is not until recently that it has been addressed in its full MC complexity. Early studies focusing on very detailed models of binary species drops [2][3][4][5][6][7] yielded valuable information regarding the intricacies of internal drop processes. However, this detailed model was not intended for utilization in spray calculations.…”

Section: Introductionmentioning

confidence: 99%

Modeling evaporation of Jet A, JP-7, and RP-1 drops at 1 to 15 bars

Harstad

Bellan

2004

Combustion and Flame

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“…in which transport is restricted to molecular diffusion in the radial direction. The well-mixed model is the simplest; it has been used by Newbold and Amundson (1973) and Law (1976). However, the experiments of Hanson et al (1982) indicate large departures from equilibrium distillation.…”

Section: Introductionmentioning

confidence: 99%

“…Comparing the two models, Landis and Mills (1974) and Sirignano and Law (1978) found that while the overall evaporation rate was little affected by liquid phase processes, there were substantial differences in the vaporization rates of the individual components and in liquid composition history. More recent studies have modelled the internal circulation induced by external gas flow (Law et al 1976, Lara-Urbaneja and Sirignano 1981, and Tong and Sirignano 1986. These show that even with very rapid internal circulation the well-mixed state is not attained, because mixing across the streamlines of the liquid flow must still occur by molecular diffusion.…”

Section: Introductionmentioning

confidence: 99%

Autoignition of Single Droplets of Two-Component Liquid Fuels

Bergeron

Hallett

1989

Combustion Science and Technology

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Measurements and predictions of the ignition delay time of single droplets of several twocomponent mixtures at atmospheric pressure are presented. The results show that ignition is controlled by the more volatile component o r the mixture. The ignition delay time is found to be nearly independent of species transport in the liquid phase. Mixture reaction rates are shown to be adequately modelled by simple linear combination of component rate data.

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Theory of convective, transient, multicomponent droplet vaporization

Cited by 38 publications

References 11 publications

Transient Heating and Liquid-Phase Mass Diffusion in Fuel Droplet Vaporization

Transient Heating and Liquid-Phase Mass Diffusion in Fuel Droplet Vaporization

Modeling evaporation of Jet A, JP-7, and RP-1 drops at 1 to 15 bars

Autoignition of Single Droplets of Two-Component Liquid Fuels

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