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Flow Instabilities From a Parabolic Thermal Wall Profile in an Annular Cavity

[+] Author Affiliations
Heather Dillon, Ashley Emery, Ann Mescher

University of Washington, Seattle, WA

Paper No. IMECE2009-11657, pp. 1907-1915; 9 pages
doi:10.1115/IMECE2009-11657
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

During the drawing of optical fibers in an enclosed furnace the heat transfer to the fiber is due to both radiation from the furnace walls and free convection from the ambient gas. The stability of the free convection is a function of the furnace wall temperature distribution and of the iris temperatures. Experimental results are presented that show how the iris temperature affects the frequency of the convective flow oscillation in a simplified annular geometry. The flow possesses hysteresis in that as the iris temperature is increased and then decreased, the oscillatory flow does not return to its initial condition. All of the flow behavior studied in the annular geometry was three-dimensional.

Copyright © 2009 by ASME

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