DETERMINATION OF THE DROP SIZE AND DISTRIBUTIONS IN SWIRL INJECTION IN CROSS FLOWS, IMPINGING, AND EFFERVESCENT INJECTORS
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Published:2024
Issue:5
Volume:34
Page:27-38
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ISSN:1044-5110
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Container-title:Atomization and Sprays
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language:en
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Short-container-title:Atomiz Spr
Author:
Park J. E.,Lee T.-W.,Maly M.,Cejpek O.,Jedelsky Jan
Abstract
We have extended the primary atomization analysis to swirl injection in cross flows, impinging, and
effervescent injectors. Using the integral form of the conservation equations, the drop size can be expressed
in terms of injection and fluid parameters, the main variable being the liquid and gas velocities.
Using the measured velocities as inputs to this <i>D</i><sub>32</sub>-equation, good agreements with experimental data are found for the drop size in the three spray geometries. Underlying physical mechanisms for the drop formation are also revealed from the analysis. The aerodynamic interaction between the swirl spray and
cross flow results in reduction in momentum, with a corresponding decrease in kinetic energy that appears
as surface tension of energy of many small droplets. Similarly, cancellation of the lateral momentum
in impinging jets and internal deceleration in effervescent injectors are the key primary atomization
routes. The use of the analytical drop size-velocity correlation has also been demonstrated for swirl
sprays in cross flows. Therefore, this approach can be used to predict the drop size and distributions in
different spray geometries, with appropriate changes in the velocity input terms and fluid properties.
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