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Experimental Investigation of Mixed Convection in Horizontal Channel Flow in Combination with Cylindrical Roughness Elements

Mäteling, Esther and Lemarechal, Jonathan and Klein, Christia and Puckert, Dominik K. and Rist, Ulrich (2020) Experimental Investigation of Mixed Convection in Horizontal Channel Flow in Combination with Cylindrical Roughness Elements. In: 21st STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics, 142, pp. 134-135. Springer Nature. 21. STAB/DGLR Symposium 2018, 06. - 07. Nov. 2018, Darmstadt, Deutschland. DOI: 10.1007/978-3-030-25253-3_51 ISBN 978-3-030-25252-6 ISSN 1612-2909

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Official URL: https://doi.org/10.1007/978-3-030-25253-3_51

Abstract

The flow features of mixed convection flow in the presence of a cylindrical roughness element are investigated in a horizontal laminar flat-plate flow inside a water channel by means of Temperature-Sensitive Paint (TSP). The buoyancy forces are generated by partially heating the flat plate, however, the beginning of the flat plate is adiabatic. A cylindrical roughness element is positioned at the start of the heated part of the test section. Different ratios of forced and free convection, which form the mixed convection flow, are investigated by adjusting the free stream velocity and the heating power. Thereby, the Reynolds number is varied in the range of 398≤Rek≤1195, while the Grashof number reaches values between 3.97⋅108≤Gr≤1.46⋅109. This leads to Richardson numbers of 0.53≤Ri≤7.72. For an increasing Reynolds number and a decreasing Grashof number, the onset of longitudinal vortices is shifted downstream while their spanwise wavelength is increased. The wake of the element changes from a well-organized, laminar flow into a turbulent flow which is accompanied with a broadening of the wake. An interaction between the wake and the vortices is observed for some conditions. In addition, this study reveals that the Richardson number is not a suitable measure for predicting the flow features of the investigated configurations.

Item URL in elib:https://elib.dlr.de/122976/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Print ISBN 978-3-030-25252-6 Online ISBN 978-3-030-25253-3 ISSN-electronic 1860-0824
Title:Experimental Investigation of Mixed Convection in Horizontal Channel Flow in Combination with Cylindrical Roughness Elements
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mäteling, EstherLehrstuhl für Strömungslehre und Aerodynamisches Institut, RWTH Aachen UniversityUNSPECIFIED
Lemarechal, JonathanJonathan.Lemarechal (at) dlr.dehttps://orcid.org/0000-0002-3333-2664
Klein, ChristiaUNSPECIFIEDUNSPECIFIED
Puckert, Dominik K.Institut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIED
Rist, UlrichInstitut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIED
Date:2020
Journal or Publication Title:21st STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:142
DOI :10.1007/978-3-030-25253-3_51
Page Range:pp. 134-135
Editors:
EditorsEmailEditor's ORCID iD
Dillmann, Andreasandreas.dillmann@dlr.deUNSPECIFIED
Heller, GerdAirbus BremenUNSPECIFIED
Krämer, EwaldInstitut für Aerodynamik und Gasdynamik Universität StuttgartUNSPECIFIED
Wagner, ClausClaus.Wagner@dlr.deUNSPECIFIED
Tropea, CameronFachgebiet Strömungslehre und Aerodynamik, TU DarmstadtUNSPECIFIED
Jakirlic, SuadTU DarmstadtUNSPECIFIED
Publisher:Springer Nature
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
ISSN:1612-2909
ISBN:978-3-030-25252-6
Status:Published
Keywords:Temperature-Sensitive Paint, TSP, Mixed Convection, Roughness Element
Event Title:21. STAB/DGLR Symposium 2018
Event Location:Darmstadt, Deutschland
Event Type:international Conference
Event Dates:06. - 07. Nov. 2018
Organizer:STAB/DGLR
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:03 Dec 2018 14:02
Last Modified:17 Jun 2020 17:41

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