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Measurement of the turbulent heat fluxes in mixed convection using combined stereoscopic PIV and PIT

Mommert, Michael and Niehaus, Konstantin A. and Schiepel, Daniel and Schmeling, Daniel and Wagner, Claus (2023) Measurement of the turbulent heat fluxes in mixed convection using combined stereoscopic PIV and PIT. Experiments in Fluids, 64 (111), pp. 1-13. Springer Nature. doi: 10.1007/s00348-023-03645-4. ISSN 0723-4864.

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Official URL: https://link.springer.com/article/10.1007/s00348-023-03645-4


The results of simultaneous measurements of velocity and temperature fields in a turbulent mixed convection airflow are analyzed and discussed. To access local temperature and velocity fields in airflows, we present a combination of stereoscopic particle image velocimetry and particle image thermometry. The obtained flow fields make it possible to determine the local convective heat fluxes, thus givinginsight into the dynamics of plumes and Taylor-Görtler-like vortices. The evaluated mean local heat fluxes further reveal that the main convection roll transports a substantial amount of heat alongthe coolingplate and back to the heated bottomplate. Yet, the associated mean turbulent heat fluxes remain positive as they are dominated by the correlation of the temperature and the vertical velocity component. More specifically, a statistical analysis of the local heat fluxdistribution reveals that Taylor-Görtler-like vortices lead to more skewed distributions of the turbulent convective heat fluxes than plumes.

Item URL in elib:https://elib.dlr.de/193851/
Document Type:Article
Title:Measurement of the turbulent heat fluxes in mixed convection using combined stereoscopic PIV and PIT
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Mommert, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-7817-3388136823258
Niehaus, Konstantin A.UNSPECIFIEDhttps://orcid.org/0000-0001-7083-7998UNSPECIFIED
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:2 June 2023
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-13
Publisher:Springer Nature
Keywords:particle image velocimetry, particle image thermometry, thermochromic liquid crystals, mixed convection, heat transport
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 - RoSto - Rolling Stock
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Mommert, Michael
Deposited On:13 Jun 2023 16:50
Last Modified:19 Jun 2023 12:11

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