Regensburg 2013 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 33: Poster II
DY 33.35: Poster
Donnerstag, 14. März 2013, 17:00–19:00, Poster C
Measurements of LSC dynamics in Rayleigh-Bénard convection with an ultrasonic anemometer — •Katharina Witte and Joachim Peinke — TWiST-Turbulence, Windenergy and Stochastics, University of Oldenburg, Germany
The dynamics of large-scale circulation (LSC) in Rayleigh-Bénard convection are investigated experimentally, particularly with regard to rotations and cessations. The measurements are conducted over the range of the Rayleigh-number from 1*109 to 6*109. For this a cylindrical cell of aspect ratio Γ =1 is used, which is heated from below and cooled from top. Utilization of water enriched with particles as working fluid offers the possibility to applicate an ultrasonic anemometer, which is based on the Doppler effect. With this anemometer velocity profiles of the particles which correspond to those of the fluid are taken. This contact less method is carried out inside the cell by sensors which are recessed into the cell wall.