Parts | Days | Selection | Search | Downloads | Help

DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.26: Poster

Monday, March 7, 2005, 15:30–18:00, Poster TU D

Noise-induced order and ratchet effect in a thermal convection loop — •Chol-Ung Choe^1,2 and Hartmut Benner¹ — ¹Institut für Festkörperphysik, TU-Darmstadt — ²Department of Physics, University of Science Pyongyang, DPR Korea

We show analytically and experimentally that noise-induced order as well as ratchet effects are efficiently achieved by applying vertical and horizontal noise fluctuations on a thermal convection loop. The idea of our investigation is based on the observation that a thermal convection loop shows stability properties similar to those of the well-known Kapitza pendulum which can be stabilized or destabilized by rapid vibrations of its pivot. The mechanism of fast parametric modulation by regular oscillations could be extended to the case of irregular fluctuations.