Regular and chaotic flow patterns upon impulsive spin-up of a Rayleigh-Benard convection cell

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A cylindrical, completely enclosed Rayleigh-Benard convection cell with radius-to-height ratio {Gamma}={1/2} is subjected to impulsive spin-up about its vertical axis. The authors study produces TLC (thermochromic liquid crystal) temperature measurements and PIV (particle image velocimetry) velocity reconstruction of the transient state between the two regimes of turbulent convection corresponding to the cell at rest and in steady rotation. The most persistent transient feature emerging is a sharply defined ringlike pattern characterized by a decrease in temperature and high azimuthal shear. The latter leads to formation of Kelvin-Helmholz vortices. Initially azimuthally regular, the pattern of these vortices loses its regularity and ... continued below

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7 p.

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Vorobieff, P. & Ecke, R.E. October 1, 1997.

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A cylindrical, completely enclosed Rayleigh-Benard convection cell with radius-to-height ratio {Gamma}={1/2} is subjected to impulsive spin-up about its vertical axis. The authors study produces TLC (thermochromic liquid crystal) temperature measurements and PIV (particle image velocimetry) velocity reconstruction of the transient state between the two regimes of turbulent convection corresponding to the cell at rest and in steady rotation. The most persistent transient feature emerging is a sharply defined ringlike pattern characterized by a decrease in temperature and high azimuthal shear. The latter leads to formation of Kelvin-Helmholz vortices. Initially azimuthally regular, the pattern of these vortices loses its regularity and thus completes the transition to rotating convection state.

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7 p.

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OSTI as DE98000268

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  • 4. experimental chaos conference, Boca Raton, FL (United States), 6-8 Aug 1997

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  • Other: DE98000268
  • Report No.: LA-UR--97-3463
  • Report No.: CONF-970851--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 538032
  • Archival Resource Key: ark:/67531/metadc690279

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 20, 2016, 1:50 p.m.

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Vorobieff, P. & Ecke, R.E. Regular and chaotic flow patterns upon impulsive spin-up of a Rayleigh-Benard convection cell, article, October 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc690279/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.