Plume fragmentation by bulk interactions in turbulent Rayleigh-Bénard convection
Bosbach, Johannes and Weiss, Stephan and Ahlers, Guenter (2012) Plume fragmentation by bulk interactions in turbulent Rayleigh-Bénard convection. Physical Review Letters, Vol. 108 (5), pp. 1-5. DOI: 10.1103/PhysRevLett.108.054501.
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Official URL: http://link.aps.org/doi/10.1103/PhysRevLett.108.054501
Using compressed gases with Prandtl numbers near 0.7, we obtained flow visualizations of turbulent Rayleigh-Bénard convection in a cylindrical sample with an aspect ratio D/L = 10 (D is the diameter and L the height) by the shadowgraph method. Focusing on the plumes under the top plate, we found that their length had a log-normal distribution, suggesting a fragmentation process. Fragmentation events could be visually identified in the images and involved plume interactions with bulk fluctuations or upwelling domain walls. We found the mean spacing between plumes to vary with the Rayleigh number in proportion to the volume-averaged Kolmogorov length of the turbulent bulk fluctuations, providing further evidence for plume-bulk interactions.
|Additional Information:||054501 (2012)|
|Title:||Plume fragmentation by bulk interactions in turbulent Rayleigh-Bénard convection|
|Journal or Publication Title:||Physical Review Letters|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1-5|
|Series Name:||American Physical Society|
|Keywords:||Rayleigh-Bénard convection, plumes, turbulence, length scales, flow visualisation|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L AR - Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Systems & Cabin|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Fluid Systems|
|Deposited By:||Dr.rer.nat. Johannes Bosbach|
|Deposited On:||06 Feb 2012 13:39|
|Last Modified:||04 Apr 2013 16:31|
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