Optical observation of ultrafine droplets and air flows from newly designed supersonic air assist spray nozzles

Seiji S. Miyashiro; H. Mori; H. Takechi

doi:10.1117/12.424248

17 April 2001 Optical observation of ultrafine droplets and air flows from newly designed supersonic air assist spray nozzles

Seiji S. Miyashiro, H. Mori, H. Takechi

Author Affiliations +

Proceedings Volume 4183, 24th International Congress on High-Speed Photography and Photonics; (2001) https://doi.org/10.1117/12.424248
Event: 24th International Congress on High-Speed Photography and Photonics, 2000, Sendai, Japan

Abstract

One of the authors developed a new spray drying nozzle (special quadruplet fluid spray nozzle) for drug manufacturing and it has succeeded in manufacturing fine particles of 2 micrometer diameter of 1/15 ratios to those currently in use. The flow visualization results show that the two air jets become under-expanded on both edge sides of the nozzle, generate shock and expansion waves alternately on each side and reach the edge tip, where they collide, unite, and spout out while shock and expansion waves are again formed in the mixed jet. When the edge surfaces are supplied with water, the water is extended into thin film by the air jet and intensely disturbed. At the nozzle tip it is torn into droplets, which are further atomized afterwards in shock waves. At the spray tip, the friction with ambient air shears the droplets furthermore, and they decrease further in size.

Citation Download Citation

Seiji S. Miyashiro, H. Mori, and H. Takechi "Optical observation of ultrafine droplets and air flows from newly designed supersonic air assist spray nozzles", Proc. SPIE 4183, 24th International Congress on High-Speed Photography and Photonics, (17 April 2001); https://doi.org/10.1117/12.424248

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