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Internal Flow in Vacuum Ejector Using Water Table

[+] Author Affiliations
Naoya Kurahashi, Junjiro Iwamoto

Tokyo Denki University, Tokyo, Japan

Masaki Endo

Tokyo Metropolitan College of Industrial Technology, Tokyo, Japan

Paper No. FEDSM2007-37224, pp. 1689-1696; 8 pages
doi:10.1115/FEDSM2007-37224
From:
  • ASME/JSME 2007 5th Joint Fluids Engineering Conference
  • Volume 1: Symposia, Parts A and B
  • San Diego, California, USA, July 30–August 2, 2007
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-4288-6 | eISBN: 0-7918-3805-6
  • Copyright © 2007 by ASME

abstract

The purpose of this study elucidates a structure of internal flow in vacuum ejector. The vacuum ejector is used as a part of automatic conveyance systems, in which precision parts or foods are handled utilizing vacuum pressure from the ejector. So far, the vacuum ejector has been designed mostly by experience and the internal flow in vacuum ejector is not well analyzed. The flow field of ejector is so small that conventional measurements can not be employed and it is difficult to obtain the detailed information. Thus, the flow in the ejector is simulated on water table using hydraulic analogy. In this paper, to obtain optimum performance of the ejector, we examined the different ejector models with parameters, such as the nozzle width and the distance between nozzle and inlet of mixing chamber. As a result, it is shown that maximum performance is obtained for the ejector model with the nozzle width of 40mm, the mixing chamber width of 100mm and the port size of 40mm.

Copyright © 2007 by ASME

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