Prime modes of fluid circulation in large-aspect-ratio turbulent Rayleigh-Bénard convection.

Based on a detailed experimental investigation in an aspect-ratio-4 rectangular cell in the range 3.7 x 10(7) View Article and Find Full Text PDF

Spectral analysis of boundary layers in Rayleigh-Bénard convection.

A combined experimental and numerical study of the boundary layer in a 4:1 aspect-ratio Rayleigh-Bénard cell over a four-decade range of Rayleigh numbers has been undertaken aimed at gaining a better insight into the character of the boundary layers. The experiments involved the simultaneous laser Doppler anemometry measurements of fluid velocity at two locations, i.e.

Oscillating large-scale circulation in turbulent Rayleigh-Bénard convection.

We report on the dynamics and structure of the turbulent velocity field in a high-Rayleigh-number (Ra = 5.9 x 10(8))thermal convection cell with an aspect ratio of 4. Spectral density functions (measured with laser Doppler velocimetry) indicated the existence of a large-scale periodic component.