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A Study of Strong Shear Flow in a Narrow Gap of an Atomization Equipment

[+] Author Affiliations
Michihisa Tsutahara, Kenichi Hashimoto, Akira Michiwaki, Yuuichi Masuda

Kobe University, Kobe, Hyogo, Japan

Masakazu Enomura, Xiaofeng Zhang

M-Technique Co., Ltd., Izumi, Osaka, Japan

Paper No. IMECE2008-66568, pp. 49-53; 5 pages
doi:10.1115/IMECE2008-66568
From:
  • ASME 2008 International Mechanical Engineering Congress and Exposition
  • Volume 10: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B, and C
  • Boston, Massachusetts, USA, October 31–November 6, 2008
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4871-5 | eISBN: 978-0-7918-3840-2
  • Copyright © 2008 by ASME

abstract

The mechanism of solid particle atomization by strong shear flow inside a narrow gap between a still disk and a rapidly rotating disk of a new beadless disperser called SS5 is clarified. We show that the solid particles rotate at the same rate as fluid particles, that is the angular velocity is a half of the vorticity using a equipment consisting of a rotating cylinder inside a cylindrical vessel, instead of rotating disks. The cavitation is shown to occur inside the gap and the mechanism of atomization of solid particles is considered to be due to the cavitation collapse. The cavitation generation is also considered to be promoted by the rapid rotation of the particles due to the strong shear and also by the pressure drop due to the centrifugal force driven by the rotation of the disk.

Copyright © 2008 by ASME
Topics: Shear flow

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