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Simultaneous Tomographic Particle Image Velocimetry and Thermometry of Turbulent Rayleigh-Bénard Convection

Schiepel, Daniel and Schmeling, Daniel and Wagner, Claus (2021) Simultaneous Tomographic Particle Image Velocimetry and Thermometry of Turbulent Rayleigh-Bénard Convection. Measurement Science and Technology, 32 (9), pp. 1-17. Institute of Physics (IOP) Publishing. doi: 10.1088/1361-6501/abf095. ISSN 0957-0233.

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Official URL: https://iopscience.iop.org/article/10.1088/1361-6501/abf095


This paper presents a non-intrusive measurement technique for the simultaneous assessment of the three-dimensional (3D) velocity and temperature fields in thermal convection. The technique is based on the combination of tomographic particle image velocimetry and particle image thermometry. Thermochromic liquid crystal particles serve simultaneously as both flow tracers and thermometers. The velocity fields were measured in a volume of 62 500 cm3 and the temperature fields in a subvolume of 20 000 cm3. Turbulent Rayleigh–Bénard convection in a water-glycol mixture at Ra = 7.0 × 10^9 and Pr = 18 was used as a model system to measure the instantaneous 3D velocity and temperature fields at the same time. Uncertainties of σv ⩽ 0.66mm s−1 for the velocity and σt ⩽ 0.095 K for the temperature measurement were estimated corresponding to dynamic ranges of 24 and 21 levels, respectively. Correlating the measured temperature and velocity fields, it is shown that the obtained large-scale structure reflects a region of warm rising fluid which is well-known from the literature.

Item URL in elib:https://elib.dlr.de/136623/
Document Type:Article
Title:Simultaneous Tomographic Particle Image Velocimetry and Thermometry of Turbulent Rayleigh-Bénard Convection
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schiepel, DanielUNSPECIFIEDhttps://orcid.org/0000-0002-3703-3514UNSPECIFIED
Schmeling, DanielUNSPECIFIEDhttps://orcid.org/0000-0003-2712-9974UNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Date:28 May 2021
Journal or Publication Title:Measurement Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-17
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:Institute of Physics (IOP) Publishing
Keywords:Tomo-PIV, PIT, Thermochromic Liquid Crystals
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Schiepel, Dr. Daniel
Deposited On:21 Jun 2021 22:29
Last Modified:28 Mar 2023 23:57

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