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A Numerical Analysis on Cavitation Effects in Microchannels

[+] Author Affiliations
Obinna Uyanna, Hamidreza Najafi

Florida Institute of Technology, Melbourne, FL

Paper No. IMECE2017-71909, pp. V007T09A010; 9 pages
doi:10.1115/IMECE2017-71909
From:
  • ASME 2017 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluids Engineering
  • Tampa, Florida, USA, November 3–9, 2017
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5842-4
  • Copyright © 2017 by ASME

abstract

Cavitation process in microchannels has been widely studied from variety of perspectives. In diesel engines, smaller droplets provide a larger surface area and this leads to more efficient combustion. It has been observed that the atomization process is influenced by turbulence and cavitation in the nozzle. These factors therefore contribute to the size of the droplets, the spray angle, penetration of the fuel and other characteristics. In the present study, a numerical simulation of cavitation process in microchannels similar to nozzles is conducted using ANSYS Fluent. Cavitation phenomenon has been analyzed numerically for a variety of downstream pressures and L/D ratios. The effect of the geometry of the nozzle (length to diameter ratio) and downstream flow pressure conditions on the cavitation are also studied. The results can be used for optimal design of diesel injectors.

Copyright © 2017 by ASME

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