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Simultaneous Measurement of Temperature and Velocity Fields in Convective Air Flows

Schmeling, Daniel and Bosbach, Johannes and Wagner, Claus (2014) Simultaneous Measurement of Temperature and Velocity Fields in Convective Air Flows. Measurement Science & Technology, 25 (3), pp. 1-17. Institute of Physics (IOP) Publishing. DOI: 10.1088/0957-0233/25/3/035302 ISSN 0957-0233

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Official URL: http://iopscience.iop.org/0957-0233/25/3/035302/article

Abstract

Thermal convective air flows are of great relevance in fundamental studies and technical applications such as heat exchangers or indoor ventilation. Since these kinds of flow are driven by temperature gradients, simultaneous measurements of instantaneous velocity and temperature fields are highly desirable. A possible solution is the combination of particle image velocimetry (PIV) and particle image thermography (PIT) using thermochromic liquid crystals (TLCs) as tracer particles. While combined PIV and PIT is already state of the art for measurements in liquids, this is not yet the case for gas flows. In this study we address the adaptation of the measuring technique to gaseous fluids with respect to the generation of the tracer particles, the particle illumination and the image filtering process. Results of the simultaneous PIV/PIT stemming from application to a fluid system with continuous air exchange are presented. The measurements were conducted in a cuboidal convection sample with air in- and outlet at a Rayleigh number Ra ≈ 9.0 × 10^7. They prove the feasibility of the method by providing absolute and relative temperature accuracies of σT = 0.19K and σ� dT = 0.06 K, espectively. Further open issues that have to be addressed in order to mature the technique are identified.

Item URL in elib:https://elib.dlr.de/83770/
Document Type:Article
Title:Simultaneous Measurement of Temperature and Velocity Fields in Convective Air Flows
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
Journal or Publication Title:Measurement Science & Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:25
DOI :10.1088/0957-0233/25/3/035302
Page Range:pp. 1-17
Publisher:Institute of Physics (IOP) Publishing
ISSN:0957-0233
Status:Published
Keywords:PIV, PIT, thermochromic liquid crystals, air flows, convection
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 - Project Next Generation Train II (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Schmeling, Dr Daniel
Deposited On:17 Feb 2014 09:58
Last Modified:06 Sep 2019 15:21

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