Atomization and Sprays Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

For Online Access

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1998, Volume8

Issue 3

124 pages

Issue price - $75.00

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

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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