Excited Liquid Jets in Subsonic Crossflow

Elshamy, Omar; Tambe, Samir B.; Jeng, San‐Mou

doi:10.2514/6.2007-1340

Cited by 8 publications

(11 citation statements)

References 13 publications

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“…Flow visualization was carried out by Elshamy et al [22] on the liquid jets in a crossflow using Mie-scattering technique to develop the following correlations for the outer boundaries of spray plume.…”

Section: Figurementioning

confidence: 99%

“…Around twenty seven correlations in power-law form and ten correlations in logarithmic form were available in the literature. In addition, only two empirical correlations proposed by Chen et al [32] and Elshamy et al [22] will be included in the correlations with the exponential form.…”

Section: Classification Of Empirical Correlationsmentioning

confidence: 99%

“…In addition, this review will be limited only to liquid jet-in-crossflow studies focussed on a crossflow that has a uniform velocity profile across the cross section. The studies considering non-uniform crossflow such as a swirling crossflow or mechanically exited liquid jets in crossflow [19][20][21], crossflow containing a shear layer [22] will not be included. In addition, the studies regarding the controlled liquid jet such as exciting liquid jet [23] will be excluded.…”

Section: Introductionmentioning

confidence: 99%

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A Review on Empirical Correlations for Jet/Spray Trajectory of Liquid Jet in Uniform Cross Flow

2015

International Journal of Spray and Combustion Dynamics

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The empirical correlations for the prediction of jet/spray penetration of liquid jet in subsonic uniform crossflow are reviewed in this study. Considerable number of empirical correlations had been proposed by many investigators. It has generally known that the jet/spray trajectory of a liquid jet in a cross-flow is a function of the liquid to air momentum flux ratio and the normalized distance in the airstream direction from the injector. However, several researchers incorporated the Weber number, liquid-to-water or air viscosity ratio, pressure ratio or Reynolds number, temperature ratio in the empirical correlations.Two different classification methods of correlations, i.e. classification based on mathematic functional form and classification based on flow regime, are introduced in this study. The one classification of existing correlations based on functional form includes correlations in a powerlaw, logarithmic, and exponential forms, respectively. The other classification of previous correlations based on flow regime includes one, two and three regime, correlations.Correlations in a power-law functional form can be further divided into three groups such as momentum flux ratio, Weber number and other parameters forms. Correlations in logarithmic functional form can be also grouped as momentum flux ratio and Weber number forms.Most of the evaluation studies reported the significant discrepancies of predicted values by the existing correlations. The possible reasons for discrepancies will be summarized as measurement technique, assumptions made in defining terms in the liquid to air momentum flux ratio, difficulties in defining the boundaries of the liquid jets, turbulence level in the core and boundary layer of incoming jet and gas flows, nozzle/injector geometry and its position in the crossflow. However, it can be found from the several evaluation studies that the power-law functional form with momentum flux ratio and two regimes correlations provided relatively the best fit to experimental data.

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Section: Figurementioning

confidence: 99%

Section: Classification Of Empirical Correlationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Review on Empirical Correlations for Jet/Spray Trajectory of Liquid Jet in Uniform Cross Flow

2015

International Journal of Spray and Combustion Dynamics

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“…The liquid puff generated randomly at the liquid upper surface is the main parame- ter affecting mixing of the spray field. Typically, when a jet with a square wave form was injected into cross-flows, penetration of the gaseous jet increased and separated into two branches [4]; however, in the case of a liquid jet injected into cross-flows with a higher injection frequency, the higher injection frequency caused decreasing penetration depth [8]. Liquid jets at maximum pressure penetrated the upper region in the cross-flow field, and penetrated the bottom region at minimum pressure.…”

Section: Spray Structure and Penetrationmentioning

confidence: 97%

“…Narayanan et al [7] determined that the pulsation frequency for maximized jet spread and mixing is equal to or greater than that associated with the unforced transverse jet. Elshamy et al [8] investigated the dynamic behavior of mechanically excited liquid jets injected into subsonic air cross-flow streams. Using a phase locked PIV system, they measured the instantaneous droplet velocities in the liquid jet column region.…”

Section: Introductionmentioning

confidence: 99%

Spray jet penetration and distribution of modulated liquid jets in subsonic cross-flows

et al. 2010

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Modulated liquid jets injected into subsonic cross-flows are empirically studied by using a mechanical liquid jet modulation apparatus. Experimental investigations were conducted using water over a range of cross-flow velocities from 5 m/s to 143 m/s and with modulated liquid jet frequencies from 35.7 Hz to 166.2 Hz and so on. PDPA(phase Doppler particle anemometry) was employed to measure droplet diameter and velocity with various spray cross-sections from Z/d=20 to Z/d=60. The spray structure, penetration depth, SMD(Sauter mean diameter), volume flux and velocity characteristics of modulated liquid jets injected into cross-flows were examined. As oscillation of the periodic pressure that could make liquid jet moved up and down in cross-flow field, the mixing process was facilitated. This phenomenon has the advantage of mixing the spray concentration from the center area to the outer area. Also, a bulk liquid jet puff was detected in the upper field of the liquid jet surface. The modulation effect appears significant in the extent of the spray oscillation. The correlation equations for the liquid jet boundary of the upper and lower regions which related to the Strouhal number have been presented to predict the spray structure under modulation conditions. Because of the modulation frequency, an inclination of averaged SMD for the structured layer was evanescent which contributed to the promotion of the macroscopic spray mixing process. Cross-sectional characteristics of SMD had the same tendency over a range of various modulation frequencies. As the modulation frequency increased, the region of volume flux distribution also increased.

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Effects of pulse injection on the flow field structure and combustion performance in a kerosene-fueled supersonic combustor

Chen,

Wang,

Tian

et al. 2025

Acta Astronautica

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Excited Liquid Jets in Subsonic Crossflow

Cited by 8 publications

References 13 publications

A Review on Empirical Correlations for Jet/Spray Trajectory of Liquid Jet in Uniform Cross Flow

A Review on Empirical Correlations for Jet/Spray Trajectory of Liquid Jet in Uniform Cross Flow

Spray jet penetration and distribution of modulated liquid jets in subsonic cross-flows

Effects of pulse injection on the flow field structure and combustion performance in a kerosene-fueled supersonic combustor

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