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Flow Field Analysis of a Single Piezoelectric Fan

[+] Author Affiliations
Andrew Eastman, Mark Kimber

University of Pittsburgh, Pittsburgh, PA

Paper No. IMECE2009-12708, pp. 1429-1436; 8 pages
doi:10.1115/IMECE2009-12708
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

Piezoelectrically actuated fans are relatively simple structures consisting of a piezoelectric material affixed to a thin cantilever beam. It is then subjected to a current that causes the beam to oscillate by the constriction and expansion of the piezoelectric material. A common application is that of electronics cooling where the induced flows can greatly augment natural or forced convection. Previous studies have sought to explore the flow field of piezoelectric fans in relation to its heat transfer application. This research seeks to expand upon that knowledge with a focus on measuring the flow parallel to the fan blade. A fan with length and width of 36.5 mm and 12.7 mm, respectively, is excited with an oscillating voltage input of 62.5 Hz and varying amplitudes. A Particle Image Velocimetry system, able to chart particle movement in the x and y directions, is employed to aid in understanding the flow field created by the fan with an emphasis on studying the vortex shed by a single half period of oscillation. This information has the potential to be a starting point for further exploration into a dual fan application and how their interactions alter vortex shedding in both two and three dimensions.

Copyright © 2009 by ASME
Topics: Flow (Dynamics)

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