The effects of pulsation and retraction on non-Newtonian flows in three-stream injector atomization systems

Strasser, Wayne; Battaglia, Francine

doi:10.1016/j.cej.2016.10.046

Cited by 23 publications

(5 citation statements)

References 39 publications

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“…Therefore, gas energy is more efficiently transferred to the liquid. The liquid film breakup and atomization processes could be governed by several instability mechanisms, so the breakup morphology and mode of liquid film is interesting and varied. − The influence of both Kelvin-Helmholtz (KH) and Rayleigh-Taylor (RT) mechanisms has been shown to be very important. − The KH mechanism occurs due to difference in velocities across an interface. The RT mechanism occurs in the presence of unfavorable density stratification at an interface in an acceleration field.…”

Section: Introductionmentioning

confidence: 99%

Nonmonotonic Effects of Aerodynamic Force on Droplet Size of Prefilming Air-Blast Atomization

Zhao

et al. 2018

Ind. Eng. Chem. Res.

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The goal of this investigation is to improve the understanding of the mechanism on prefilming atomization. The coaxial two-fluid prefilming air-blast atomization has two airflows: inner air jet and outer air jet. It is generally believed that droplet size decreases monotonically with increasing gas velocity in air-blast atomization. However, this work shows that in prefilming atomization the droplet size increases with the increase of gas velocity and then decreases with the increase of gas velocity when the velocity of the other airflow is high. The relationship between two air jets in prefilming air-blast atomization is mutual restriction rather than assistance. To investigate the nonmonotonic phenomenon, the modified Kelvin-Helmhotz and Rayleigh-Taylor instability atomization model for the prefilming air-blast nozzle is induced. This study presents the model developed to predict the performance of coaxial atomizers, and the experimental results are consistent with the model estimates.

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Section: Introductionmentioning

confidence: 99%

Nonmonotonic Effects of Aerodynamic Force on Droplet Size of Prefilming Air-Blast Atomization

Zhao

et al. 2018

Ind. Eng. Chem. Res.

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“…It is worth noting that these works pertain to static feed conditions, and the cavitating flow exhibit a steady shedding frequency. For unsteady atomization, it would require a different type of analysis for differentiating between the system harmonics and that of the cavitation [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation Investigations of Periodic Cavitation Shedding With Special Emphasis on Three-Dimensional Asymmetry in a Scaled-Up Nozzle Orifice

Bai

Tijsseling

Wang

et al. 2021

Journal of Fluids Engineering

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The periodic shedding of cloud cavitation in a nozzle orifice has a significant influence on the flow field and may have destructive effects. Most of the existing research on the shedding of cloud cavitation in an orifice is based on experimental visualization with focus on the 2D motion of the re-entrant jet and the shedding mechanism. However, the actual cloud cavitation shedding in an orifice is a complex 3D process. Some limited signs of three-dimensionality and asymmetry in cylindrical orifices have been detected recently, but the 3D shedding characteristics remain unclear. In this paper, the cavitation regimes and periodic shedding process in the scaled-up nozzle orifice used by Stanley experiment were simulated with Large Eddy Simulation (LES). The re-entrant jet and periodic shedding mechanism, as well as the shedding frequency, were analyzed from 2D and 3D perspectives. The main results show that the simulated cavitation regimes and the 2D periodic shedding mechanism agree fairly well with the experimental observations, but more 3D features are revealed. By analyzing the 3D shedding process and the three-dimensionality caused by the inclination of the closure line, the three-dimensional asymmetric shedding mode with phase difference p is revealed. Based upon this finding, the shedding frequency and Strouhal number are calculated. The corresponding relationships between shedding frequencies and the frequency peaks of the power spectrum density (PSD) for pressure fluctuations are also confirmed. These results extend the understanding of the unsteady cavitating flow within nozzle orifices from 2D to 3D patterns.

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“…Several ways can be used to facilitate the breakup of jet, for example by high velocity air, and the application of external mechanical energy through a rotating or vibrating device (Lefebvre, 1989;Li et al, 2006;Nasr et al, 2006). Previous studies on various designs onspray devices have given a better understanding of performance and the resulting spray characteristics in different fields (Avulapati & Venkata, 2013;Jiang et al, 2014;Kourmatzis & Masri, 2015;Jadidi, et al, 2016;Strasser & Battaglia, 2017). These devices are very significant to the development and characteristics of sprays for irrigation sprinklers.…”

Section: Introductionmentioning

confidence: 99%

Combined Effect Of NozzleDispersion Device On Spray Pattern Uniformity For Low Pressure Sprinklers

Issaka

Fordjour

Ibrahim

2020

ESJ

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The effects of pulsation and retraction on non-Newtonian flows in three-stream injector atomization systems

Cited by 23 publications

References 39 publications

Nonmonotonic Effects of Aerodynamic Force on Droplet Size of Prefilming Air-Blast Atomization

Nonmonotonic Effects of Aerodynamic Force on Droplet Size of Prefilming Air-Blast Atomization

Large Eddy Simulation Investigations of Periodic Cavitation Shedding With Special Emphasis on Three-Dimensional Asymmetry in a Scaled-Up Nozzle Orifice

Combined Effect Of NozzleDispersion Device On Spray Pattern Uniformity For Low Pressure Sprinklers

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