Simplified model for the prediction of the occurrence of film atomization in corner geometries

Bacharoudis, Evangelos; Bratec, Hervé; Keirsbulck, Laurent; Buchlin, Jean‐Marie; Labraga, L.

doi:10.1016/j.ijmultiphaseflow.2013.10.003

Cited by 11 publications

(9 citation statements)

References 14 publications

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“…6d-f), from which the streamwise ligament emerges. The formation of the meniscus is due to capillary action and is a well-known liquid behaviour for sheardriven flows over corner geometries (Bacharoudis et al, 2014). Accumulation is a well-documented atomisation regime, Fig.…”

Section: Accumulationmentioning

confidence: 95%

“…The addition of a reliable model for the accurate estimation of the contact-line forces is paramount. Especially for the prediction of any receding dynamics of the liquid film, or atomisation at corner edges (Bacharoudis et al, 2014). Thus, the RCLS method was further developed to include a dynamic contact angle model, which is being validated against experimental data for the simulation of droplet splashing on a dry hydrophobic surface.…”

Section: Final Remarksmentioning

confidence: 99%

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From High-Fidelity Numerical Simulations of a Liquid-Film Atomization to a Regime Classification

Bilger

Cant

2018

Atomiz Spr

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High-fidelity numerical simulations of spray formation were conducted with the aim of improving fundamental understanding of airblast liquid film atomisation. The gas/liquid interaction in the near nozzle region is investigated for a multitude of operating conditions in order to extrapolate phenomenological and breakup predictions. To reach this goal, the Robust Conservative Level Set (RCLS) method has been used. For a fixed prefilmer geometry, we performed a parametric study on the impact of various liquid and gas velocities on the topological evolution of the liquid interface. The behaviour and development of the liquid film is found to be influenced mainly by the relative inertia of the gas and the liquid, the liquid surface tension and interfacial shear stresses. Preliminary regime maps predicting the prefilming liquid-sheet atomisation behaviour are constructed based on our numerical results. Three distinct types of "regime" are reported: accumulation, ligament-merging and 3-D wave mode. In addition, these results also show the influence of vortex action and rim-driven dynamics on the breakup mechanism at the atomiser edge. An increase in liquid injection speed leads to the generation of smaller droplets whereas an increase in air velocity does not point to one simple conclusion.

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Section: Accumulationmentioning

confidence: 95%

Section: Final Remarksmentioning

confidence: 99%

From High-Fidelity Numerical Simulations of a Liquid-Film Atomization to a Regime Classification

Bilger

Cant

2018

Atomiz Spr

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“…Several authors have considered the conditions required for a thin liquid film to accelerate around a corner, developing and validating 1D models Owen & Ryley (1985); Friedrich et al (2008); Bacharoudis et al (2014). The modelling approach used constructs a force/momentum balance across the presented corner: where the forces imposed by surface tension and gravity are sufficient to entirely overcome the liquid film momentum, the flow is accelerated around the corner; where momentum dominates these forces, the film does not flow around the corner, but instead will detach from the solid surface.…”

Section: Prefilmer Tip Flowsmentioning

confidence: 99%

Measurements of fuel thickness for prefilming atomisers at elevated pressure

Brend

Barker

Carrotte

2020

International Journal of Multiphase Flow

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This work describes an experimental study of the fuel flows on the prefilmer of an aerospace gas turbine airblast atomiser at elevated pressure. The work identifies the physics leading to contradictory findings within the literature. This concerns an important atomisation boundary condition, whether the thickness of the fuel film on the prefilming surface influences the downstream drop size distribution. Analysis of the experimental data shows that fuel film thickness becomes uncorrelated with the downstream drop size if surface tension forces dominate inertia at the prefilmer tip. Fuel film thickness however provides the initial length scale for primary atomization if the fuel inertia forces exceed surface tension. It is the high inertial conditions that are associated with gas turbine operation, but the low inertial conditions that are readily achievable at laboratory scale through momentum flux scaling. Additionally, a detailed statistical description of the fuel flow has been provided for the atomiser tested. This reveals the importance of upstream hydrodynamic and aerodynamic boundary conditions on the probability of a ligament forming. Surprisingly, operating pressure is shown to have limited effect on the probability of ligament formation, a significant advantage for future modelling of the primary atomization processes.

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“…It should be noted that determining the transition from a flow regime without LAW to a flow regime where LAWs are present is still an unsolved challenge in two-phase flow field. In an attempt to establish a mass separation model which considers the effect of LAW at the interface, a force balance model was presented by [12]. However, this model neglected the effect of liquid film properties such as surface tension and viscosity on LAW formation and growth.…”

Section: Introductionmentioning

confidence: 99%

Mass Separation Regimes for Shear-Driven Liquid Film at Expanding Corners

Sadeghizadeh

Drallmeier

2021

ICLASS

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Separation of gas-driven liquid film from an expanding corner is encountered in many applications such as port fuel injection (PFI) and air-fuel mixing in jet engines. However, physical insight about the liquid mass separation from expanding corners is very limited. Experimental studies show two different flow regimes in shear-driven flows: flow regime where there is no large amplitude waves at the interface and flow regime with large amplitude waves at the interface. Correspondingly liquid mass separation is shown to occur due to two effects: uniform film inertia and large amplitude waves at the interface. In absence of large amplitude waves for large corner angle, the liquid mass separation could occur purely due to uniform film inertia. Two distinct correlations have been proposed for each flow regime based on operating parameters. The controlling parameters, which affect the liquid mass separation at the corner are gas and liquid Reynolds numbers, liquid film properties, and corner angle. Additionally, the proposed correlations would probably need a larger dataset for a robust consistency evaluation.

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Simplified model for the prediction of the occurrence of film atomization in corner geometries

Cited by 11 publications

References 14 publications

From High-Fidelity Numerical Simulations of a Liquid-Film Atomization to a Regime Classification

From High-Fidelity Numerical Simulations of a Liquid-Film Atomization to a Regime Classification

Measurements of fuel thickness for prefilming atomisers at elevated pressure

Mass Separation Regimes for Shear-Driven Liquid Film at Expanding Corners

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