Simulation of liquid jet primary breakup: Dynamics of ligament and droplet formation

Shinjo, Junji; Umemura, Atsushi

doi:10.1016/j.ijmultiphaseflow.2010.03.008

Cited by 369 publications

(247 citation statements)

References 29 publications

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“…Ligaments are formed near the edge of the liquid sheet, which then in turn break into a large number of droplets. Different formation mechanisms of liquid ligaments have been discussed in previous works [5,6]. These mechanisms including the expansion of holes-in-liquid-sheets and the Rayleigh-Plateau instability of rims are also observed in the present simulation.…”

Section: General Behaviorsupporting

confidence: 75%

Direct numerical simulation of an atomizing biodiesel jet: Impact of fuel properties on atomization characteristics

Ling

Legros

Popinet

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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The utilization of biodiesel is an effective approach to reduce pollution from internal combustion engines and thus has attracted steadily increasing interest in the recent years. As the viscosity of biodiesel is much higher than that of standard diesel, the atomization characteristics of a biodiesel jet can significantly deviate from those of a standard diesel jet under identical injection conditions. Since atomization of the injected fuel has a strong impact on fuel-air mixing and the following combustion processes, it is important to investigate the atomization of biodiesel and in particular to understand how the fuel properties affect the atomization process and the resulting spray characteristics. In the present study, three-dimensional direct numerical simulations are conducted to investigate atomizing biodiesel and diesel jets. The novel adaptive multiphase solver Basilisk is used for simulations. The statistics of droplets formed in the biodiesel jet is compared to the diesel jet under identical injection conditions.

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Section: General Behaviorsupporting

confidence: 75%

Direct numerical simulation of an atomizing biodiesel jet: Impact of fuel properties on atomization characteristics

Ling

Legros

Popinet

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

View full text Add to dashboard Cite

show abstract

“…(10), on the other hand, is widely used in the context of inertiadominated two-phase flows, such as liquid jets, bubbles and drops, e.g. [58][59][60][61][62]. It is important to note that some studies on film flows use a Weber number defined as the inverse of We as defined in Eq.…”

Section: A Physical Mechanisms and Pertinent Dimensionless Groupsmentioning

confidence: 99%

Self-similarity of solitary waves on inertia-dominated falling liquid films

et al. 2016

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We propose the first consistent scaling of solitary waves on inertia-dominated falling liquid films, which accurately accounts for the driving physical mechanisms and leads to a self-similar characterization of solitary waves. Direct numerical simulations of the entire two-phase system are conducted using a state-of-the-art finite volume framework for interfacial flows in an open domain that was previously validated against experimental film-flow data with excellent agreement. We present a detailed analysis of the wave shape and the dispersion of solitary waves on 34 different water films with Reynolds numbers Re = 20 − 120 and surface tension coefficients σ = 0.0512 − 0.072 N m −1 on substrates with inclination angles β = 19 • − 90 • . Following a detailed analysis of these cases we formulate a consistent characterization of the shape and dispersion of solitary waves, based on a newly proposed scaling derived from the Nusselt flat film solution, that unveils a self-similarity as well as the driving mechanism of solitary waves on gravity-driven liquid films. Our results demonstrate that the shape of solitary waves, i.e. height and asymmetry of the wave, is predominantly influenced by the balance of inertia and surface tension. Furthermore, we find that the dispersion of solitary waves on the inertia-dominated falling liquid films considered in this study is governed by non-linear effects and only driven by inertia, with surface tension and gravity having a negligible influence.

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“…This method has been successfully used in our previous studies of turbulent atomization (Shinjo and Umemura, 2010;Shinjo and Umemura, 2011), spray evaporation (Shinjo and Umemura, 2013;Shinjo et al, 2015) and emulsion droplet microexplosion/puffing (Shinjo et al, 2014).…”

Section: Interface-capturing Numerical Methodsmentioning

confidence: 99%

“…For other validation cases, satisfactory results have been already obtained. They include linear/non-linear droplet oscillations (Shinjo et al, 2014), capillary wave dynamics and droplet pinch-off (Shinjo and Umemura, 2010) and boiling surface dynamics (Shinjo et al, 2014).…”

Section: Code Validationmentioning

confidence: 99%

Modeling Temperature Distribution Inside an Emulsion Fuel Droplet Under Convective Heating: A Key to Predicting Microexplosion and Puffing

et al. 2016

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Microexplosion/puffing is rapid disintegration of a water-in-oil emulsion droplet caused by explosive boiling of embedded superheated water sub-droplets. To predict microexplosion/puffing, modeling the temperature distribution inside an emulsion droplet under convective heating is a prerequisite, since the temperature field determines the location of nucleation (vapor bubble initiation from superheated water). In the first part of the present study, convective heating of water-in-oil emulsion droplets under typical combustor conditions is investigated using high-fidelity simulation in order to accurately model inner-droplet temperature distribution. The shear force due to the ambient air flow induces internal circulation inside a droplet. It has been found that for droplets under investigation in the present study, the liquid Peclet number PeL is in a transitional regime of 100

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Simulation of liquid jet primary breakup: Dynamics of ligament and droplet formation

Cited by 369 publications

References 29 publications

Direct numerical simulation of an atomizing biodiesel jet: Impact of fuel properties on atomization characteristics

Direct numerical simulation of an atomizing biodiesel jet: Impact of fuel properties on atomization characteristics

Self-similarity of solitary waves on inertia-dominated falling liquid films

Modeling Temperature Distribution Inside an Emulsion Fuel Droplet Under Convective Heating: A Key to Predicting Microexplosion and Puffing

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