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Momentum and Buoyancy Repartition in Turbulent Mixed Convection

Wetzel, Tim and Wagner, Claus (2019) Momentum and Buoyancy Repartition in Turbulent Mixed Convection. In: ERCOFTAC Series, 25 (39), pp. 291-297. Springer Cham. Direct and Large-Eddy Simulation XI, 29. - 31. Mai 2017, Pisa, Italien. DOI: 10.1007/978-3-030-04915-7_39 ISBN 978-3-030-04914-0 ISSN 1382-4309

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Official URL: https://doi.org/10.1007/978-3-030-04915-7_39

Abstract

Turbulent mixed convection is a common phenomenon in applications such as heat exchangers and climatisation in transport vehicles and buildings and was often studied in the past. Metais and Eckert [6] experimentally analyse the heat transport in a vertical pipe heated from the outside. The suppression of turbulence in vertical pipes is analysed by Bae et al. [1] by means of direct numerical simulation (DNS). Mixed convection in a vertical channel is studied in DNS by Kasagi and Nishimura [4], who report profiles of one-point statistics and budgets of the turbulent kinetic energy. They also compare asymmetrically heated turbulent channel flow with channel flow subjected to uniform wall mass injection and suction, as well as with liquid metal channel flow under the influence of a transversal magnetic field. All three flow types exhibit similar effects regarding the suppression and enhancement of turbulence near the walls and Kasagi and Nishimura state that the buoyancy does not affect the velocity fluctuations directly. In a more recent work, He, He and Seddighi [3] study the effects of generic body forces on vertical pipe flow and relate the relaminarization to a lowering of the apparent friction velocity. Wall-normal profiles of the mean streamwise velocity and the turbulent kinetic energy are presented in this paper for different Grashof numbers and demonstrate the buoyancy-induced flow asymmetry. Furthermore, budgets of the Reynolds stress tensor are analysed with regard to the repartition of turbulent stresses between the velocity components. Finally, the heat transport characteristics of the flow are examined with the help of a quadrant analysis of the Reynolds shear stress and the turbulent heat fluxes in order to understand how the coherent structures transport heat.

Item URL in elib:https://elib.dlr.de/126452/
Document Type:Conference or Workshop Item (Other)
Additional Information:Electronic ISBN: 978-3-030-04915-7
Title:Momentum and Buoyancy Repartition in Turbulent Mixed Convection
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wetzel, TimTim.Wetzel (at) dlr.deUNSPECIFIED
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Date:February 2019
Journal or Publication Title:ERCOFTAC Series
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:25
DOI :10.1007/978-3-030-04915-7_39
Page Range:pp. 291-297
Editors:
EditorsEmail
Salvetti, Maria VittoriaUniversita di Pisa
Armenio, VincenzoUniversita degli studi di Trieste
Fröhlich, JochenTechnische Universität Dresden
Geurts, Bernard J.University of Twente
Kuerten, HansEindhoven University of Technology
Publisher:Springer Cham
Series Name:Direct and Large-Eddy Simulation XI
ISSN:1382-4309
ISBN:978-3-030-04914-0
Status:Published
Keywords:DNS, channel flow, mixed convection, quadrant analysis
Event Title:Direct and Large-Eddy Simulation XI
Event Location:Pisa, Italien
Event Type:international Conference
Event Dates:29. - 31. Mai 2017
Organizer:ERCOFTAC
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 for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Wetzel, Tim
Deposited On:19 Feb 2019 11:27
Last Modified:19 Feb 2019 11:27

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