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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.

Full text not available from this repository.

Official URL: http://link.aps.org/doi/10.1103/PhysRevLett.108.054501

Abstract

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.

Document Type:Article
Additional Information:054501 (2012)
Title:Plume fragmentation by bulk interactions in turbulent Rayleigh-Bénard convection
Authors:
AuthorsInstitution or Email of Authors
Bosbach, JohannesUNSPECIFIED
Weiss, StephanDepartment of Physics, University of California, Santa Barbara, CA 93106, USA
Ahlers, GuenterDepartment of Physics, University of California, Santa Barbara, CA 93106, USA
Date:2012
Journal or Publication Title:Physical Review Letters
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Vol. 108
DOI:10.1103/PhysRevLett.108.054501
Page Range:pp. 1-5
Series Name:American Physical Society
Status:Published
Keywords:Rayleigh-Bénard convection, plumes, turbulence, length scales, flow visualisation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems & Cabin
Location: Göttingen
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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