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Plume Dynamics in Convective Air Flows by Combined PIT/PIV

Schmeling, Daniel and Bosbach, Johannes and Wagner, Claus (2014) Plume Dynamics in Convective Air Flows by Combined PIT/PIV. 17th International Symposia on Applications of Laser Techniques to Fluid Mechanics Lisbon 2014, 07. - 10. July 2014, Lissabon, Portugal.

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Official URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2014/program.asp

Abstract

Tracer particles of thermochromic liquid crystals, which change their color according to the surrounding temperature, enable simultaneous temperature and velocity field measurements and allow for studies of dynamic processes in convective flows (Dabiri, 2009). As opposed to previous studies, which focus on flows of liquids, we employ these tracers for measurements in air flows. We present the cornerstones of the combined PIV / PIT measurement technique, which we advanced to flow measurements in air. The technique is applied to mixed convection in a cuboidal sample, where it is used to capture thermal structures close above the heating plate. Four different parameter combinations of Ra, Re and Ar are considered. The fingerprints of the thermal plumes, which emerge from the thermal boundary layer, are well resolved in the measurement plane. Using an image rate of 4 Hz, the plume dynamics were captured time resolved as well. The probability density functions of the temperatures in the measurement plane reveal a bimodal distribution, which allows for a discrimination of the thermal background from the plumes. The velocity PDFs reveal a flow reversal in the measurement plane between Ar = 1.8 and Ar = 3.1.

Item URL in elib:https://elib.dlr.de/86736/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Paper-Nr.: 03.14_5_113
Title:Plume Dynamics in Convective Air Flows by Combined PIT/PIV
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:2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-9
Series Name:Conference Proceedings online
Status:Published
Keywords:PIV, PIT, convection, plume dynamics
Event Title:17th International Symposia on Applications of Laser Techniques to Fluid Mechanics Lisbon 2014
Event Location:Lissabon, Portugal
Event Type:international Conference
Event Dates:07. - 10. July 2014
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:21 Jul 2014 17:14
Last Modified:21 Oct 2014 13:54

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