Atomization and Sprays

Lefebvre, A. H.

doi:10.1201/9781482227857

Cited by 814 publications

(368 citation statements)

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“…The physical properties of the fuels, which may influence the development of the fuel jet, are the density, ρ, viscosity, µ and surface tension, σ. 26 For the fuels used here, these properties are summarised in Table I. The relative difference between the density, ρ, dynamic viscosity, µ, kinematic viscosity, ν, and surface tension, σ of the JP8 and HRJ is about +5%, −5%, −10%, and +5%, respectively.…”

Section: Experimental Facilitymentioning

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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Section: Experimental Facilitymentioning

confidence: 99%

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

Charalampous

Hardalupas

2016

Physics of Fluids

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“…Numerous studies of droplet spreading after droplet impact have been conducted by observing the millimeter or micrometer droplet impact, [1][2][3][4] to share fruitful knowledge with us. At the early stage of droplet impact, the spreading radius R was found to be given by…”

Section: Introductionmentioning

confidence: 99%

Early stage of nanodroplet impact on solid wall

et al. 2016

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In this study, we investigated nanodroplet spreading at the early stage after the impact using molecular dynamics simulations by changing the magnitude of the intermolecular force between the liquid and wall molecules. We showed that the droplet deformation after the impact greatly depends on the intermolecular force. The temporal evolution of the spreading diameters was measured by the cylindrical control volume for several molecular layers in the vicinity of the wall. At the early stage of the nanodroplet impact, the normalized spreading radius of the droplet is proportional to the square root of the normalized time,t. This result is understood by the geometrical consideration presented by Rioboo et al.["Time evolution of liquid drop impact onto solid, dry surfaces," Exp. Fluids 33, 112-124 (2002)]. In addition, we found that as the intermolecular force between the liquid and wall becomes stronger, the normalized spreading diameter of the first molecular layer on the wall remains less dependent on the impact velocity. Furthermore, the time evolution of the droplet spreading changes from √t to logt with time. C 2016 AIP Publishing LLC.

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“…Once the fuel is injected into the combustion chamber, the fuel mixes with air and vaporizes. The air-fuel mixing process depends on spray characteristics, which in turn depend on the injection pressure and the dimensions and geometry of the nozzle orifice among other factors ( [2][3] [4][5] [6]). …”

Section: Introductionmentioning

confidence: 99%

A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles

Molina

Salvador

Carreres

et al. 2014

Energy Conversion and Management

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Elsevier Molina, S.; Salvador Rubio, FJ.; Carreres Talens, M.; Jaramillo, D. (2014). A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles. Energy Conversion and Management. 79:114-127. doi:10.1016/j.enconman.2013.12.015. THE INFLUENCE OF THE USE OF ELLIPTICAL ORIFICES ON THE INNER NOZZLE FLOW AND CAVITATION DEVELOPMENT IN DIESEL INJECTOR A COMPUTATIONAL INVESTIGATION ON

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Atomization and Sprays

Cited by 814 publications

References 0 publications

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

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

Early stage of nanodroplet impact on solid wall

A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles

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