Dynamics of baroclinic wave pattern in transition zones between different flow regimes

Abstract

Baroclinic waves, both steady and time-dependent, are studied experimentally in a differentially heated rotating cylindrical gap with a free surface, cooled from within. Water is used as working fluid. We focus especially on transition zones between different flow regimes, where complex flow pattern like mixed-mode states are found. The transition from steady wave regime to irregular flow is also of particular interest. The surface flow is observed with visualisation techniques. Velocity time series are measured with the optical Laser-Doppler-Velocimetry technique. Thermographic measurements are applied for temperature field visualisations.