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Heat Dependent Thermo-Viscous Shear-Thinning Fluid Flowing around a Double-Sphere Configuration within a Pipe

Rütten, Markus (2019) Heat Dependent Thermo-Viscous Shear-Thinning Fluid Flowing around a Double-Sphere Configuration within a Pipe. In: Proceedings of 8th GACM Colloquium on Computational Mechanics, 8. kassel university press. Proceedings of the 8th GACM Colloquium on Computational Mechanics for Young Scientists from Academia and Industry, August 28–30, 2019 in Kassel, Germany, 28.-30. Aug. 2019, Kassel, Germany. ISBN 978-3-7376-5093-9

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Abstract

Non-Newtonian fluid properties can change the flow behaviour and the resulting flow topology significantly, even for low Reynolds number laminar flows. The prediction of the flow field is even more difficult when thermal effects come into play. In particular when high shear rates occur and temperature is changing the fluid properties, unexpected flow phenomena can be observed. Focal point of this study is the laminar pipe flow of a thermo-viscous shear thinning Carreau fluid around double-sphere configurations. The two spheres are arranged in-line in pipe axial direction. In dependence of the distance between the spheres the flow topology around the sphere pair changes. The non-isothermal non-newtonian shear-thinnning fluid flows reveal temperature dependent deflections of the wake flow. Complicated flow separation and attachment structures between and behind the spheres occur. In the present CFD study sphere-wall temperature-dependent flow-structures are investigated. The temperature dependence of the fluid viscosity is modelled by applying the standard Williams-Landel-Ferry equation. It is shown that thermal-viscous shear thinning due to high shear rates and heat transfer from the sphere walls leads to a significant decrease of viscosity of three orders of magnitude in the near-field of the spheres. The locally reduced viscosity can be used to control the flow around the double sphere flow configuration. In the present simulation campaign thermal boundary conditions are varied over a wide range in order to derive relations between heat transfer, non-newtonian fluid properties and the behaviour of the double-sphere flow.

Item URL in elib:https://elib.dlr.de/129602/
Document Type:Conference or Workshop Item (Speech)
Title:Heat Dependent Thermo-Viscous Shear-Thinning Fluid Flowing around a Double-Sphere Configuration within a Pipe
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rütten, Markusmarkus.ruetten (at) dlr.deUNSPECIFIED
Date:29 August 2019
Journal or Publication Title:Proceedings of 8th GACM Colloquium on Computational Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:8
Publisher:kassel university press
ISBN:978-3-7376-5093-9
Status:Published
Keywords:thermo-viscous shear thinning fluid flow double sphere configuration
Event Title:Proceedings of the 8th GACM Colloquium on Computational Mechanics for Young Scientists from Academia and Industry, August 28–30, 2019 in Kassel, Germany
Event Location:Kassel, Germany
Event Type:international Conference
Event Dates:28.-30. Aug. 2019
Organizer:University of Kassel
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 > High Speed Configurations, GO
Deposited By: Rütten, Dr.-Ing. Markus
Deposited On:17 Oct 2019 09:52
Last Modified:17 Oct 2019 09:52

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