Development and assessment of an improved droplet breakup model for numerical simulation of spray in a turbulent flow field

Omidvar, Amir

doi:10.1016/j.applthermaleng.2019.04.090

Cited by 12 publications

(6 citation statements)

References 32 publications

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“…The breakup model constant, stripping breakup constant (𝐶 𝑠 ) in the Reitz-Diwakar model, is the common tuning parameter to vary LPL [52,53]. Fig.…”

Section: Appendix a Modeled Fuel Propertiesmentioning

confidence: 99%

Large eddy simulation of soot formation and oxidation for different ambient temperatures and oxygen levels

Zhang

Ong

Pang³

et al. 2022

Applied Energy

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“…The breakup model constant, stripping breakup constant (𝐶 𝑠 ) in the Reitz-Diwakar model, is the common tuning parameter to vary LPL [52,53]. Fig.…”

Section: Appendix a Modeled Fuel Propertiesmentioning

confidence: 99%

Large eddy simulation of soot formation and oxidation for different ambient temperatures and oxygen levels

Zhang

Ong

Pang³

et al. 2022

Applied Energy

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“…2019). By transforming the effect of turbulence on the droplet breakup into the changes in the effective surface tension of the droplet in the spray model, Omidvar (2019) developed an improved droplet breakup model based on the effective surface tension, which had good accuracy in predicting the local Sauter mean diameter of spray droplets. In an accelerating airflow, the transient aerodynamic load on the droplets plays a relevant role to anticipate the onset of droplet breakup, and determines the droplet deformation by combining with the residence time on the droplet's trajectory (Schmelz & Walzel 2003; Garcia-Magarino, Sor & Velazquez 2015; Lopez-Gavilan et al.…”

Section: Introductionmentioning

confidence: 99%

Droplet breakup in airflow with strong shear effect

Wang

Che

2022

J. Fluid Mech.

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The deformation and breakup of droplets in airflows is important in spray and atomisation processes, but the shear effect in non-uniform airflow is rarely reported. In this study, the deformation and breakup of droplets in a shear flow of air is investigated experimentally using high-speed imaging, digital image processing and particle image velocimetry. The results show that in airflow with a strong shear effect, the droplet breakup exhibits unique features due to the uplift and stretching produced by the interaction between the deformed droplet and the shear layer. The breakup process can be divided into three stages according to the droplet morphology and the breakup mechanism, namely the sheet breakup, the swing breakup and the rim breakup stages. Theoretical analysis reveals that the swing breakup is governed by the transverse Rayleigh–Taylor instability. A regime map of the droplet breakup is produced, and the transitions between different regimes are obtained theoretically. The stretching liquid film during the droplet deformation and the fragment size distribution after droplet breakup are analysed quantitatively, and the results show that they are determined by the competition of breakup at different stages affected by the shear. Finally, the effect of the droplet viscosity is investigated, and the viscosity inhibits the droplet breakup in a strong shear airflow.

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“…2 The efficiency and stability of the engine depend on atomization processes. 3–5 The influence of atomization processes on diesel engines is on the combustion rate, whereas it is on mixture preparation in spark-ignited engines. 6 The overall aim of the atomization processes is to introduce the liquid fuel in a much higher surface area to volume ratio for optimal air-fuel mixture and combustion.…”

Section: Introductionmentioning

confidence: 99%

Analytical modelling of laminar drag and freestream turbulence eddies on droplet breakup criterion for internal combustion engines

Diemuodeke

Sher

2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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The paper presents novel analytical droplet breakup criteria, on Weber number (We)-relative turbulence intensity and We-Ohnesorge (Oh) representations, based on the critical Weber number. The We-Oh analytical criterion stressed the importance of turbulence effects on We-Oh breakup criterion at high We-Oh applications. In developing the analytical models the energy criterion for a disturbed parent droplet to disintegrate and the dual-timescale for turbulent shear in droplet dispersion were considered. The present model has an advantage over to two popular droplet breakup criterion models (Pilch-Erdman and Kolev) because the present model has the ability to support a parametric investigation of droplet breakup characteristics in turbulent flow fields. The Weber-relative turbulence intensity and We-Oh analytical breakup criteria are in good agreement with published experimental data. It is envisaged that the analytical model will be incorporated into larger CFD codes for spray simulation. The continuous research in this important area will present the next generation fuel injectors for improved fuel economy of internal combustion engines, especially high-pressure direct injection engines. The model has the potential to be applied in other natural and engineering systems.

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Development and assessment of an improved droplet breakup model for numerical simulation of spray in a turbulent flow field

Cited by 12 publications

References 32 publications

Large eddy simulation of soot formation and oxidation for different ambient temperatures and oxygen levels

Large eddy simulation of soot formation and oxidation for different ambient temperatures and oxygen levels

Droplet breakup in airflow with strong shear effect

Analytical modelling of laminar drag and freestream turbulence eddies on droplet breakup criterion for internal combustion engines

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