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Turbulent flow through a high aspect ratio cooling duct with asymmetric wall heating

Published online by Cambridge University Press:  04 December 2018

Thomas Kaller Open the ORCID record for Thomas Kaller [Opens in a new window] ,
Vito Pasquariello Open the ORCID record for Vito Pasquariello [Opens in a new window] ,
Stefan Hickel Open the ORCID record for Stefan Hickel [Opens in a new window]  and
Nikolaus A. Adams
Thomas Kaller*
Affiliation:
Technical University of Munich, Department of Mechanical Engineering, Chair of Aerodynamics and Fluid Mechanics, Boltzmannstr. 15, D-85748 Garching bei München, Germany
Vito Pasquariello
Affiliation:
Technical University of Munich, Department of Mechanical Engineering, Chair of Aerodynamics and Fluid Mechanics, Boltzmannstr. 15, D-85748 Garching bei München, Germany
Stefan Hickel
Affiliation:
Faculty of Aerospace Engineering, Technische Universiteit Delft, Kluyverweg 1, 2629 HT Delft, The Netherlands
Nikolaus A. Adams
Affiliation:
Technical University of Munich, Department of Mechanical Engineering, Chair of Aerodynamics and Fluid Mechanics, Boltzmannstr. 15, D-85748 Garching bei München, Germany
*
†Email address for correspondence: thomas.kaller@tum.de
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Abstract

We present well-resolved large-eddy simulations of turbulent flow through a straight, high aspect ratio cooling duct operated with water at a bulk Reynolds number of $Re_{b}=110\times 10^{3}$ and an average Nusselt number of $Nu_{xz}=371$. The geometry and boundary conditions follow an experimental reference case and good agreement with the experimental results is achieved. The current investigation focuses on the influence of asymmetric wall heating on the duct flow field, specifically on the interaction of turbulence-induced secondary flow and turbulent heat transfer, and the associated spatial development of the thermal boundary layer and the inferred viscosity variation. The viscosity reduction towards the heated wall causes a decrease in turbulent mixing, turbulent length scales and turbulence anisotropy as well as a weakening of turbulent ejections. Overall, the secondary flow strength becomes increasingly less intense along the length of the spatially resolved heated duct as compared to an adiabatic duct. Furthermore, we show that the assumption of a constant turbulent Prandtl number is invalid for turbulent heat transfer in an asymmetrically heated duct.

JFM classification

Boundary Layers: Pipe flow boundary layer Turbulent Flows: Turbulent Flows Mixing: Turbulent mixing
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 860 , 10 February 2019 , pp. 258 - 299
Copyright
© 2018 Cambridge University Press 

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