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Dynamics of thermal plumes in turbulent mixed convection studied with combined Particle Image Thermometry and Velocimetry

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.

Full text not available from this repository.

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/
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:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schmeling, DanielDaniel.Schmeling (at) dlr.deUNSPECIFIED
Bosbach, Johannesjohannes.bosbach (at) dlr.deUNSPECIFIED
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
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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