2:15 PM - 2:30 PM
[MIS18-03] Diffusive behavior of columnar vortices in rotating thermal convection
Keywords:Natural convection, Rotating field, Diffusive motion, Vortex dynamics
The present study is paying attention to such vortex dynamics observable in rotating RBC. With using encapsulated thermochromic liquid crystals, long-time O(103 s) experimental visualizations of the vortices on time variations of a temperature field were conducted, and we reached two novel insights. One is horizontal diffusive motion like Brownian motion of the columnar vortices. Statistical analyses on motions of the columnar vortices elucidated various kinds of diffusive motion. Such diffusive motions strongly depend on observation timescale (vortex lifetime) and columnar vortices present anomalous diffusive motion. Another is the effect of centrifugal force even under conditions for empirically negligible small effects of centrifugal force. This is the first found thanks to our long-time observations and might give a new caution to rotating RBC studies.