Liquid breakup at the surface of turbulent round liquid jets in still gases

Sallam, Khaled; Dai, Z.; Faeth, G. M.

doi:10.1016/s0301-9322(01)00067-2

Cited by 170 publications

(137 citation statements)

References 24 publications

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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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“…[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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“…recirculation inlet (RI) jet, will begin as a column of liquid but will lose coherence and break apart farther downstream below the nozzle exit. Sallam et al [7] provides the following correlation, from experimental data, for the break-up length (L c ) for a water jet in air.…”

Section: Vertical and Horizontal Jet Characteristicsmentioning

confidence: 99%

“…Note that Equation (3.1) is applicable for water jets discharging horizontally or vertically down in air. For liquid jets with a Weber of 670 -13,700 (as is the case for both the RI and TI), C is equal to 2.1 with a standard deviation of 0.2 [7]. From Equation (3.1), the recirculation inlet (RI) has a break-up length between 345 and 417 inches with a plunge height of only 62.5 inches.…”

Section: Vertical and Horizontal Jet Characteristicsmentioning

confidence: 99%

F-Area Pump Tank 1 Mixing Analysis

Tamburello¹,

Dimenna²,

Lee³

2008

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“…Extensive work on this primary breakup process has been carried out earlier in this laboratory. This work was limited, however, to the primary breakup of round turbulent liquid jets in still gases with fully-developed turbulent pipe flow at the injector exit, see , Sallam et al (2002), Faeth (1993,1995) and Wu et al (1992. Present measurements were carried out considering round liquid jets for various liquids produced using long injector passage lengths (greater than 50 injector diameters) with sufficiently-large injector Reynolds numbers to ensure fully-developed turbulent pipe flow at the injector exit, based on criteria developed by .…”

Section: Primary Breakup Of Turbulent Liquid Jets In Uniformmentioning

confidence: 99%

Liquid Breakup in Dense Sprays

Faeth¹,

Dahm²

2006

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Liquid breakup at the surface of turbulent round liquid jets in still gases

Cited by 170 publications

References 24 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?

F-Area Pump Tank 1 Mixing Analysis

Liquid Breakup in Dense Sprays

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