Schmeling, Daniel and Bosbach, Johannes and Wagner, Claus (2015) Dynamics of thermal plumes in turbulent mixed convection studied with combined Particle Image Thermometry and Velocimetry. International Conference on Rayleigh-Bénard Turbulence, 01. - 05. June 2015, Göttingen, Germany.
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Official URL: http://www.lfpn.ds.mpg.de/RBC2015/
Abstract
The dynamics of thermal plumes and their abundance is investigated in mixed convection in a cuboidal sample. The working fluid is air at ambient pressure. Combined Particle Image Thermography (PIT) and Particle Image Velocimetry (PIV) is conducted in a horizontal layer close above the bottom thermal boundary layer. The fingerprints of sheet-like plumes and those of the stems of mushroom like plumes are visible in the instantaneous temperature fields. A study of temperature PDFs reveals, that the distributions can be described by a sum of two Gaussian distributions. Analysing the ratio of the probabilities P_2/P_1 reveals a sudden change at a critical Ra_c. Here P_1 denotes the abundance of fluid temperatures imprinted by the bulk flow, while P_2 represses the abundance of temperatures ascribed to warm thermal plumes. Accordingly, P_2/P_1 is a measure for the plume fraction in the measurement plane.Please see our new paper: Schmeling et al., DOI: 10.1007/s00348-015-1981-z, Exp. Fluids (in press)
Item URL in elib: | https://elib.dlr.de/96224/ | ||||||||||||
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Document Type: | Conference or Workshop Item (Poster) | ||||||||||||
Title: | Dynamics of thermal plumes in turbulent mixed convection studied with combined Particle Image Thermometry and Velocimetry | ||||||||||||
Authors: |
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Date: | 2015 | ||||||||||||
Refereed publication: | No | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | No | ||||||||||||
In ISI Web of Science: | No | ||||||||||||
Page Range: | p. 32 | ||||||||||||
Series Name: | Book of Abstracts | ||||||||||||
Status: | Published | ||||||||||||
Keywords: | thermal plumes, mixed convection, PIT, PIV | ||||||||||||
Event Title: | International Conference on Rayleigh-Bénard Turbulence | ||||||||||||
Event Location: | Göttingen, Germany | ||||||||||||
Event Type: | international Conference | ||||||||||||
Event Dates: | 01. - 05. June 2015 | ||||||||||||
Organizer: | Max Planck Institute for Dynamics and Self-Organization | ||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||
HGF - Program: | Transport | ||||||||||||
HGF - Program Themes: | Terrestrial Vehicles (old) | ||||||||||||
DLR - Research area: | Transport | ||||||||||||
DLR - Program: | V BF - Bodengebundene Fahrzeuge | ||||||||||||
DLR - Research theme (Project): | V - Next Generation Train III (old) | ||||||||||||
Location: | Göttingen | ||||||||||||
Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Fluid Systems | ||||||||||||
Deposited By: | Micknaus, Ilka | ||||||||||||
Deposited On: | 16 Jun 2015 10:55 | ||||||||||||
Last Modified: | 16 Jun 2015 10:55 |
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