elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Heat Transfer Dependent Orifice Jet Flow of a Thermo-Viscous Shear-Thinning Fluid

Rütten, Markus (2018) Heat Transfer Dependent Orifice Jet Flow of a Thermo-Viscous Shear-Thinning Fluid. In: 7th European Conference on Computational Fluid Dynamics,ECCM-ECFD 2018,. 7th European Conference on Computational Fluid Dynamics,ECCM-ECFD 2018,, 11. - 15. Juni, Glasgow, UK.

[img] PDF
3MB

Official URL: http://www.eccm-ecfd2018.org/admin/files/fileabstract/a821.pdf

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 different temperatures act on the fluid changing its properties symmetry breaking is an often observed flow phenomenon. A well known case, which is focal point of this study, is the laminar orifice jet flow of a thermo-viscous shear thinning fluid within a straight duct. Isothermal flows of newtonian fluids reveal a straight jet flow leaving the orifice, in contrast to isothermal non-newtonian fluid flows, which show a deflection of the orifice jet and complicated flow separation and attachment structures within the duct. In the present CFD study wall temperature dependent flow structures are investigated for the flow of a Carreau fluid through a duct with an orifice. The temperature dependence of the fluid viscosity is modelled by applying the standard Williams-Landel-Ferry (WLF) equation. It is shown that thermal viscous shear thinning due to high shear rates and temperatures at the duct and the orifice walls leads to a significant decrease of viscosity of three orders of magnitude in the near-field of the orifice. Locally reduced viscosity can be used to control the jet flow behaviour. 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 orifice jet flow.

Item URL in elib:https://elib.dlr.de/118798/
Document Type:Conference or Workshop Item (Speech)
Title:Heat Transfer Dependent Orifice Jet Flow of a Thermo-Viscous Shear-Thinning Fluid
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rütten, Markusmarkus.ruetten (at) dlr.deUNSPECIFIED
Date:June 2018
Journal or Publication Title:7th European Conference on Computational Fluid Dynamics,ECCM-ECFD 2018,
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:CFD, shear thinning fluids
Event Title:7th European Conference on Computational Fluid Dynamics,ECCM-ECFD 2018,
Event Location:Glasgow, UK
Event Type:international Conference
Event Dates:11. - 15. Juni
Organizer:ECCOMAS
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:29 Nov 2018 10:05
Last Modified:31 Jul 2019 20:16

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.