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Experimental investigation of natural convection in rotating and non rotating wide spherical annuli

  1. Antje Brucks*,
  2. Bernd Sitte

Article first published online: 13 DEC 2004

DOI: 10.1002/pamm.200410220

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PAMM

PAMM

Volume 4, Issue 1, pages 478–479, December 2004

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How to Cite

Brucks, A. and Sitte, B. (2004), Experimental investigation of natural convection in rotating and non rotating wide spherical annuli. Proc. Appl. Math. Mech., 4: 478–479. doi: 10.1002/pamm.200410220

Author Information

  1. Zentrum für angewandte Raumfahrttechn. u. Mikrogravitation ZARM, Universität Bremen, Am Fallturm, D - 28359 Bremen

*Phone: +49 421 218 2608, Fax: +49 421 218 2521

Publication History

  1. Issue published online: 13 DEC 2004
  2. Article first published online: 13 DEC 2004

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Abstract

The axisymmetric and stationary basic flow due to the unstable stratification in the lower region of a spherical annulus cooled from inside has already been investigated in some detail ([5], [4]). The same applies to the columnar cell flow regime of high Taylor numbers dominated by the force component perpendicular to the rotation axis ([2] and [3]). Yet the question of the initial mechanism of symmetry breaking at medium Taylor numbers has still not been investigated. Therefore the present paper investigates the onset of natural convection in a differentially heated wide spherical gap. The stability curves for radius ratio η = 0.4 and a silicon oil fluid with Pr = 39 are determined by varying Rayleigh and Taylor number. The m = 2 vortex is investigated in detail using quasi 3D Particle Image Velocimetry (PIV). (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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