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RESEARCH PAPERS

Studies on the Behavior of Droplets and the Air Flow in a Hollow-Cone Spray

[+] Author and Article Information
Tatsuyuki Okamoto, Toshimi Takagi

Department of Mechanical Engineering, Osaka University, 2-1, Yamada-Oka, Suita, Osaka, 565, Japan

Toshikazu Kaji

Miyanodai Technology Development Center, Fuji Photo Film Co., Ltd., 798, Miyanodai, Kaisei-Machi, Ashigarakami-gun, Kanagawa, 258 Japan

Katsunori Shimazaki

Maintenance Division, All Nippon Airways Co., Ltd., 3-2-5, Kasumigaseki, Chiyoda-ku, Tokyo, 100 Japan

Kenji Nakanishi

Printing and Reprographic Systems Group, Sharp Corporation, 492, Minosho-cho, Yamato-Koriyama, Nara, 639-11 Japan

J. Fluids Eng 120(3), 586-592 (Sep 01, 1998) (7 pages) doi:10.1115/1.2820704 History: Received July 05, 1994; Revised April 10, 1996; Online January 22, 2008

Abstract

Experimental and numerical investigations are made on the behavior of droplets in a hollow-cone spray paying attention to the liquid sheet formed at the orifice of pressure-swirl atomizer. Simultaneous measurements of droplet sizes and velocities are made by phase-Doppler technique and numerical simulations are carried out based on the transient Eulerian equations for the gas and the Lagrangian equation for the droplets, taking account of the liquid sheet formed at the atomizer orifice. It is shown that the simulation gives good predictions by incorporating the existence of the liquid sheet. The predicted results indicate that the movement of the liquid sheet induces a strong air stream which acts as a strong side wind against the droplets immediately after breakup. This air stream selectively transports small droplets toward the central region and plays an essential role in the classification of droplets by size. Accordingly, the existence of the liquid sheet is significant for the characteristics of droplet dispersion and it should not be neglected in the prediction of hollow-cone spray flows. In addition, the shape of the liquid sheet is theoretically computed based on the simplified equations of motion. The comparison between the theoretical computation and the experimental result suggests that the surface tension of liquid is predominant in determining the shape of the liquid sheet.

Copyright © 1998 by The American Society of Mechanical Engineers
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