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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v18.i8.40
pages 739-759

INVESTIGATION OF A COAXIAL AIR-BLAST ATOMIZER USING PARTICLE IMAGE VELOCIMETRY AND COMPUTATIONAL FLUID DYNAMICS

Daniel P. Hoeg
Department of Mechanical Engineering, University of Massachusetts, Dartmouth, MA 02747, USA
Zhen Wang
Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, China
Peter Friedman
University of Massachusetts Dartmouth
Raymond N. Laoulache
Department of Mechanical Engineering, University of Massachusetts, Dartmouth, MA 02747, USA

ABSTRAKT

Particle image velocimetry and FLUENT 6 computational fluid dynamics software were used to investigate single- and two-phase flow issuing from a coaxial air-blast atomizer. For a single-phase gaseous jet flowing through an annulus, the centerline velocity decays at a rate that is similar to a gaseous jet issuing from a circular orifice, beyond about 10 diameters downstream, and dimensionless axial velocity profiles are self-similar and in good agreement with the gaseous jet. In the case of a two-phase jet generated by an air-blast atomizer with mass loading between 0.2 and 0.35, the dispersed phase centerline velocity increases rapidly due to interaction with the annular gas flow and then decays at a rate that is slightly slower than a gaseous jet. The dispersed phase axial velocity profiles also compare well with that of a gaseous jet. Dispersed phase velocities determined using an Eulerian-Eulerian numerical model agree to within 10% of the experimental data about one diameter downstream.


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