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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.v8.i3.30
pages 267-289

EMPIRICAL CALCULATION MODEL OF THE ATOMIZATION OF A LIQUID SHEET AND A ROUND LIQUID JET IN A GASEOUS FLOW FIELD

Nobuyuki Yatsuyanagi
Kakuda Research Center, National Aerospace Laboratory, Miyagi, Japan
Hiroshi Sakamoto
Kakuda Research Center, National Aerospace Laboratory, Miyagi, Japan
Kazuo Sato
Kakuda Research Center, National Aerospace Laboratory, Miyagi, Japan

ABSTRAKT

This article presents a 1D, empirically based model for the prediction of spray charactiristics for either a liquid sheet or a round liquid jet injected into a high-velocity gaseous flow field. The model includes both primary and secondary atomization process.
In the primary breakup process, the local atomization rate and the initial size and velocity of the droplets are calculated, where the local atomization rate is basically derived from the balance of static force acting on the disturbed surface layer. In the subsequent acceleration process of the droplets, the changes in size and number are calculated. The evaluation of these characteristics is based on the energy and mass conservation equations of the droplets, where the critical Eötvös number, which was derived experimentally in the authors' former study, is substituted in the term of the energy equation. Thereafter, as the final state of the whole atomization process, final droplet sizes and their distributions are obtained. Comparison of the representative size and distribution of the spray between the calculated results and experimental results showed reasonable agreement. Comparisons were also made with other experimental data and showed good agreement.


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