Liquid Jet Breakup in Quiescent Atmosphere: A Review

Birouk, Madjid; Lekić, Nebojša

doi:10.1615/atomizspr.v19.i6.20

Cited by 92 publications

(46 citation statements)

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“…The intact core length may either decrease or increase (depending on fluid properties and orifice design) with a further increase in jet speed within the atomization region. Noting that, the average drop size is much less than the jet diameter in this regime [146][147][148][149]. The liquid-gas interfacial forces and the internal flow structure (turbulence and cavitation) are the most effective parameters on liquid jet behavior in the second wind-induced and atomization regimes.…”

Section: Primary Breakup Cylindrical Liquid Jet Breakupmentioning

confidence: 99%

“…Another admired way to categorize the cylindrical jet breakup is Ohnesorge's classification. In this method, the breakup regimes are shown on a logarithmic plot of the Reynolds number, Re, versus the Ohnesorge number, Oh, which is revealed in Figure 16 [148,166,167]. Overall, the liquid jet breakup is delayed by increasing the fluid viscosity as the internal fluid turbulence and instabilities are strongly dampened.…”

Section: Primary Breakup Cylindrical Liquid Jet Breakupmentioning

confidence: 99%

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A Comprehensive Review on Fluid Dynamics and Transport of Suspension/Liquid Droplets and Particles in High-Velocity Oxygen-Fuel (HVOF) Thermal Spray

2015

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Abstract:In thermal spraying processes, molten, semi-molten, or solid particles, which are sufficiently fast in a stream of gas, are deposited on a substrate. These particles can plastically deform while impacting on the substrate, which results in the formation of well-adhered and dense coatings. Clearly, particles in flight conditions, such as velocity, trajectory, temperature, and melting state, have enormous influence on the coating properties and should be well understood to control and improve the coating quality. The focus of this study is on the high velocity oxygen fuel (HVOF) spraying and high velocity suspension flame spraying (HVSFS) techniques, which are widely used in academia and industry to generate different types of coatings. Extensive numerical and experimental studies were carried out and are still in progress to estimate the particle in-flight behavior in thermal spray processes. In this review paper, the fundamental phenomena involved in the mentioned thermal spray techniques, such as shock diamonds, combustion, primary atomization, secondary atomization, etc., are discussed comprehensively. In addition, the basic aspects and emerging trends in simulation of thermal spray processes are reviewed. The numerical approaches such as Eulerian-Lagrangian and volume of fluid along with their advantages and disadvantages are explained in detail. Furthermore, this article provides a detailed review on simulation studies published to date. OPEN ACCESSCoatings 2015, 5 577

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Section: Primary Breakup Cylindrical Liquid Jet Breakupmentioning

confidence: 99%

Section: Primary Breakup Cylindrical Liquid Jet Breakupmentioning

confidence: 99%

A Comprehensive Review on Fluid Dynamics and Transport of Suspension/Liquid Droplets and Particles in High-Velocity Oxygen-Fuel (HVOF) Thermal Spray

2015

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“…[17][18][19][20] It is, therefore, important to examine how small changes in the fuel physical properties of the fuel may affect the liquid jet development at that location of the nozzle.…”

Section: Introductionmentioning

confidence: 99%

How do liquid fuel physical properties affect liquid jet development in atomisers?

Charalampous

Hardalupas

2016

Physics of Fluids

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The influence of liquid fuel properties on atomisation remains an open question. The droplet sizes in sprays from atomisers operated with different fuels may be modified despite the small changes of the liquid properties. This paper examines experimentally the development of a liquid jet injected from a plain orifice in order to evaluate changes in its behaviour due to modifications of the liquid properties, which may influence the final atomisation characteristics. Two aviation kerosenes with similar, but not identical physical properties are considered, namely standard JP8 kerosene as the reference fuel and bio-derived Hydro-processed Renewable Jet (HRJ) fuel as an alternative biofuel. The corresponding density, dynamic viscosity, kinematic viscosity and surface tension change by about +5%, -5%, -10% and +5% respectively, which are typical for ‘drop-in’ fuel substitution. Three aspects of the liquid jet behaviour are experimentally considered. The pressure losses of the liquid jet through the nozzle are examined in terms of the discharge coefficient for different flowrates. The morphology of the liquid jet is visualised using high magnification Laser Induced Fluorescence (LIF) imaging. Finally, the temporal development of the liquid jet interfacial velocity as a function of distance from the nozzle exit is measured from time-dependent motion analysis of dual-frame LIF imaging measurements of the jet. The results show that for the small changes in the physical properties between the considered liquid fuels, the direct substitution of fuel did not result in a drastic change of the external morphology of the fuel jets. However, the small changes in the physical properties modify the interfacial velocities of the liquid and consequently the internal jet velocity profile. These changes can modify the interaction of the liquid jet with the surroundings, including air flows in coaxial or cross flow atomisation, and influence the atomisation characteristics during changes of liquid fuels

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“…When the jet exits the focusing nozzle, it starts to disintegrate; here, the rate of disintegration could hold some important information about nozzle state. Experiments also included analysis of the effect of water pressure on AWJ diameter, as higher water pressures produce a more concentrated jet [10]. The last parameter we analysed was measurement time.…”

Section: Methodsmentioning

confidence: 99%