T. Kaller, V. Pasquariello, S. Hickel, N.A. Adams

We present well-resolved large-eddy-simulations (LES) of a straight, high-aspect-ratio cooling duct (HARCD) at a bulk Reynolds number of Re = 110*10^3 and an average Nusselt number of Nu = 371. The geometry and boundary conditions have been defined in cooperation with [l], who conducted the experimental measurements for this case. As coolant subcritical water was chosen. The current investigation focuses on the influence of asymmetrical wall heating on tbe flow field and specifically on the influence of tbe turbulence-induced secondary flow on turbulent heat transfer, tbe spatial development of the temperature boundary layer along tbe duct length and tbe accompanying viscosity modulation. Due to the viscosity drop in the vicinity of the heated wall we observe a decrease in turbulent length scales and in turbulence anisotropy, resulting in a decrease of turbulent mixing and the secondary flow strength along tbe duct.

Deutscher Luft- und Raumfahrtkongress 2017, München

Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2017

Conference Paper

englisch

21,0 x 29,7 cm, 7 Seiten

urn:nbn:de:101:1-201709294908

TR40 Technologische Grundlagen, zukünftiger Raumtransportsysteme

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29.09.2017