Repository: Freie Universit├Ąt Berlin, Math Department

Experiments on transitions of baroclinic waves in a differentially heated rotating annulus

von Larcher, T. and Egbers, C. (2005) Experiments on transitions of baroclinic waves in a differentially heated rotating annulus. Nonlinear Processes in Geophysics, 12 . pp. 1033-1041. ISSN 1023-5809 (Print); 1607-7946 (Online)

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Experiments of baroclinic waves in a rotating, baroclinic annulus of fluid are presented for two gap widths. The apparatus is a differentially heated cylindrical gap, rotated around its vertical axis of symmetry, cooled from within, with a free surface, and filled with de-ionised water as working fluid. The surface flow was observed with visualisation technique while thermographic measurements gave a detailed understanding of the temperature distribution and its time-dependent behaviour. We focus in particular on transitions between different flow regimes. Using a wide gap, the first transition from axisymmetric flow to the regular wave regime was characterised by complex flows. The transition to irregular flows was smooth, where a coexistence of the large-scale jet-stream and small-scale vortices was observed. Furthermore, temperature measurements showed a repetitive separation of cold vortices from the inner wall. Experiments using a narrow gap showed no complex flows but strong hysteresis in the steady wave regime, with up to five different azimuthal wave modes as potential steady and stable solutions.

Item Type:Article
Subjects:Mathematical and Computer Sciences > Mathematics > Applied Mathematics
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group
ID Code:693
Deposited By: Ulrike Eickers
Deposited On:07 Aug 2009 08:54
Last Modified:22 Sep 2011 13:50

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