Integrated Simulation of the Atomization Process of a Liquid Jet Through a Cylindrical Nozzle

Ishimoto, Jun; Hoshina, Hidehiro; Tsuchiyama, Tadashi; Watanabe, Hideyuki; Haga, Asako; Sato, Fuminori

doi:10.4036/iis.2007.7

Cited by 14 publications

(3 citation statements)

References 15 publications

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“…These simulations can be considered therefore under-resolved DNS, where the interface is resolved at LES grid level. Examples of primary atomization LES in the literature are Villier et al (2004); Bianchi et al (2007); Ishimoto et al (2007Ishimoto et al ( , 2008; Srinivasan et al (2008). All these simulations do not consider the sub-grid perturbations of the interface and neglect the effect of sub-grid turbulent fluctuations on it.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of spray atomization with a probability density function method

Navarro‐Martinez

2014

International Journal of Multiphase Flow

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Despite recent advances in numerical methods for multiphase flows, the complete simulation of a liquid spray is still an illusive goal. There are few models that can describe accurately both the primary and secondary atomization simultaneously. The biggest difficulty is the wide range of length scales involved; from millimetres in the largest liquid structures close to the smallest micron-size droplets. This wide range makes Direct Numerical Simulation of sprays very expensive all scales need to be resolved and expensive algorithms are required to reconstruct accurately the interface. Large Eddy Simulations are becoming increasingly popular in turbulent flows due to their better description of turbulence and the relative robustness of sub-grid stress models.Despite its advantages, Large Eddy Simulation cannot describe accurately fluid structures that occur at sub-grid levels. This paper presents a new model to describe the atomization process. The method consist of solving a joint sub-grid probability density function of liquid volume and surface using stochastic methods. The approach can simulate both dense and dilute regions of the spray. The proposed model can determine instantaneous

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Section: Introductionmentioning

confidence: 99%

Large eddy simulation of spray atomization with a probability density function method

Navarro‐Martinez

2014

International Journal of Multiphase Flow

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“…Based on the fact that the turbulence generated by the spray enhances the rapid droplet-air mixing and accelerates the droplet breakup dominated by the air action. The results of the study indicate that turbulence has an important effect on atomized droplet breakup (Hinze et al, 1955;ISHIMOTO et al, 2007;Gelfand et al, 1996;Andersson et al, 2006;Peterson et al, 2017). Turbulence intensity ( I ), strain rate ( S ), and vorticity (  ) are three parameters that measure turbulence strength.…”

Section: Droplet Breakupmentioning

confidence: 90%

Experiment Research on Atomization Process and Dust Reduction Performance of Swirl Pressure Nozzle

Zhou

wang

Song

et al. 2022

Preprint

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In this study, experimental studies on the atomization characteristics, droplet breakup and dust reduction performance of four X-swirl nozzles with different inlet/outlet diameter ratio() were performed. The results of the nozzle atomization characteristics shows that with increases, the atomization angle is increasing trend. The atomization range and the droplet velocity is decreasing trend. The results of the droplet breakup study of the nozzle show that with the increase of , the droplet breakup range of the spray field is gradually increasing, but the droplet breakup intensity of the spray field is gradually decreasing. At = 3.33 and 3.63, droplet breakup occurs mainly in the range of 0–4 mm in the strong turbulent region. At = 3.75, droplet breakup occurs mainly in the range of 0–2 mm in the strong turbulent region. At = 3.96, droplet breakup occurs mainly in the range of 0–1 mm in the strong turbulent region. Droplet breakup in the spray field at = 3.33 and = 3.67 was better than that at = 3.75 and = 3.96. From the dust reduction experimental results, the dust reduction efficiency increases and then decreases with the increase of . The dust reduction efficiency is highest among the four nozzles at = 3.67. Based on the dust reduction curves of four different of nozzles, it is predicted that the optimal dust reduction condition will be achieved at of 3.60, which provides a reference for the design and optimization of nozzles.

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“…Jun Ishimoto et al [33] computed the two-phase flows using LES-VOF method in conjunction with the CSF model [33]. According to the analysis, the atomization rate and the droplets-gas two-phase flow characteristics are found to be dominated by the turbulence fluctuations upstream of the injector nozzle, hydrodynamics instabilities at the gas-liquid interface, and shear stresses between the continuous liquid core and peripheral ambient of the jet.…”

Section: Modified Turbulence Induced Atomization Modelmentioning

confidence: 98%

Modeling the atomization of high-pressure fuel spray by using a new breakup model

Wang

et al. 2016

Applied Mathematical Modelling

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a b s t r a c tThe main objective of this research is to develop a new breakup model and investigate the influence of cavitation, turbulence on processes of high-pressure diesel sprays. The model distinguishes between jet primary atomization and droplet secondary atomization. The primary atomization was simulated based on a modified turbulence induced atomization model taken into account the coupling effects of the relaxation of the velocity profile, cavitation and turbulent fluctuation based on the principle of conservation of energy. The growth time scale of surface waves was provided by Kelvin-Helmholtz (K-H) instability theory on an infinite length cylinder for an inviscid liquid jet. The time scale of initial surface waves based on K-H instability theory on an infinite plane jet is much larger than that based on infinite length cylindrical jet. Based on the present modified model, the weighting coefficients of turbulence and cavitation on the overall atomization can be distinguished clearly. There was remarkable variation in simulated spray shape with present models. It could be seen that the original turbulence induced atomization model results in a shorter spray penetration and smaller drops near the spray core than the modified model. When applying the turbulent weighting coefficient C t in the determination of the spray angle, the resultant value of spray angle gradually drops due to the reduction of C t . However, the spray angle increases with increasing the cavitation weighting coefficient C cav . Comparing the experimental results (such as spray angle, tip penetration and spray shape) with the theoretical ones for different injection pressure, gives a reasonable agreement.

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Integrated Simulation of the Atomization Process of a Liquid Jet Through a Cylindrical Nozzle

Cited by 14 publications

References 15 publications

Large eddy simulation of spray atomization with a probability density function method

Large eddy simulation of spray atomization with a probability density function method

Experiment Research on Atomization Process and Dust Reduction Performance of Swirl Pressure Nozzle

Modeling the atomization of high-pressure fuel spray by using a new breakup model

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