Interacting, convecting, vaporizing fuel droplets with variable properties

Chiang, Chen‐Yu; Sirignano, William A.

doi:10.1016/s0017-9310(05)80271-6

Cited by 83 publications

(39 citation statements)

References 13 publications

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“…The numerically derived correlations for trailing droplet drag reduction given by Chiang (1990) predict approximately a 40% reduction in drag for a trailing droplet under the conditions of our experiment. For these conditions, the numerically derived correlation over-predicts slightly the drag reduction felt by a droplet in the wake of a lead drop.…”

Section: Droplet Dragmentioning

confidence: 54%

Experiments examining drag in linear droplet packets

Nguyen

Dunn‐Rankin

1992

Experiments in Fluids

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This paper presents an experimental study of vertically traveling droplet packets, where the droplets in each packet are aligned linearly, one behind another. The paper describes in detail, an experimental apparatus that produces repeatable, linearly aligned, and isolated droplet packets containing 1-6 droplets per packet. The apparatus is suitable for examining aerodynamic interactions between droplets within each packet. This paper demonstrates the performance of the apparatus by examining the drag reduction and collision of droplets traveling in the wake of a lead droplet. Comparison of a calculated single droplet trajectory with the detailed droplet position versus time data for a droplet packet provides the average drag reduction experienced by the trailing droplets due to the aerodynamic wake of the lead droplet. For the conditions of our experiment (4 droplet packet, 145 ~tm methanol droplets, 10 m/s initial velocity, initial droplet spacing of 5.2 droplet diameters, Reynolds number approx. 80) the average drag on the first trailing droplet was found to be 75% of the drag on the lead droplet.

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Section: Droplet Dragmentioning

confidence: 54%

Experiments examining drag in linear droplet packets

Nguyen

Dunn‐Rankin

1992

Experiments in Fluids

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“…In such a configuration, the influence of the droplet to droplet interactions should be taken into account, since the reduced distance parameter C is on the order of a few units. It is known that the decrease of the droplet spacing leads to a decrease of the Nusselt and Sherwood numbers [12]. Therefore, due to similarities between the heat and mass transfer, it was shown that the effects of the interaction are similar on both Nusselt and Sherwood numbers, and may be described by applying the same reduction factor g(C), depending only on the reduced droplet spacing C ( [10,13])…”

Section: Modeling Of the Heat Transfer Within The Dropletmentioning

confidence: 99%

Heat transfer within combusting droplets

Castanet

Lemoine

2007

Proceedings of the Combustion Institute

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The improvement of the basic understanding of heat transfer in sprays is a key point in many engineering applications. In this paper, the temperature field within combusting ethanol droplets in linear stream is investigated by the two-color laser induced fluorescence technique. Additionally, a heat transfer model within the droplet is developed, taking into account both heat conduction and heat advection by the droplet internal fluid circulation, according to the Hill vortex pattern. Heat and mass exchanges between the liquid and the gas phases are described within the framework of the quasi-steady approach and the film theory. Comparisons between measurements and computational results allow determining the intensity of the Hill vortex related to the maximum velocity at the droplet surface. An expression of the friction coefficient for combusting and interacting droplets is derived from the case of an isolated droplet and a good agreement with the experimental data is observed.

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“…Labowsky [11] and Marberry et al [12] used the point sources method to determine the burning rates of stagnant droplets in finite arrays containing up to eight symmetrically arranged monodisperse droplets. Later, the effect of droplet motion was taken into account by Chiang and Sirignano [13,14] who performed a comprehensive numerical study of two and three evaporating droplets moving together. Their computation included: the effects of variable thermophysical properties, transient heating and internal circulation in the liquid phase, boundary layer blowing, moving interface due to surface regression, and the relative motion between the droplets.…”

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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Interacting, convecting, vaporizing fuel droplets with variable properties

Cited by 83 publications

References 13 publications

Experiments examining drag in linear droplet packets

Experiments examining drag in linear droplet packets

Heat transfer within combusting droplets

Monodisperse droplet heating and evaporation: Experimental study and modelling

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