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Pulsating Jets Cooling Circular Cylinders

[+] Author Affiliations
F. Gori, G. Pacchiarotti, I. Petracci

University of Rome “Tor Vergata”, Rome, Italy

Paper No. IMECE2003-42679, pp. 153-159; 7 pages
doi:10.1115/IMECE2003-42679
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Process Industries
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Process Industries Division
  • ISBN: 0-7918-3725-4 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

The paper presents experimental heat transfer results on a circular cylinder cooled by a pulsating slot jet of air. The jet is generated by a new small wind tunnel, designed for flows with low turbulence intensities. The pulsation of the jet is obtained with the introduction of a rotating disk, divided in sectors, between the exit of the slot and the cylinder to be cooled. The disk can rotate at several frequencies. Local and average Nusselt numbers have been measured at several Reynolds numbers and distances from the slot exit. The heat transfer results are dependent on the frequency of the pulsation. The position of the cylinder, which maximizes the heat transfer, is compared to the case of a stationary jet.

Copyright © 2003 by ASME

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