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Secondary motion impact on momentum and heat transfer in a fully developed turbulent channel flow

Stroh, Alexander ORCID iD icon 1; Deyn, Lars Hendrik von ORCID iD icon 1; Schäfer, Kay ORCID iD icon 1; Forooghi, Pourya; Frohnapfel, Bettina ORCID iD icon 1
1 Institut für Strömungsmechanik (ISTM), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Surface structuring in form of streamwise-aligned triangular ridges is investigated in a DNS of a fully developed turbulent channel flow with constant wall temperatures of different values prescribed on the upper and lower walls at Reτ=180,500 and 1000. Two arrangements of the ridges on both channel walls are considered -- a symmetrical arrangement and a staggered arrangement with a spanwise shift of the upper wall structure by a half ridge-to-ridge separation. The ridges generate a strong large-scale secondary motion and hence enhance momentum and heat transfer in the channel. The composition of skin friction coefficient and Stanton number vary depending on Reτ and structure arrangement from 7 to 32%. The component wise split-up of the Stanton number shows that staggered arrangement performs better in terms of heat transfer at higher Reτ due to a more pronounced dispersive component.

Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Publikationstyp Vortrag
Publikationsdatum 11.09.2023
Sprache Englisch
Identifikator KITopen-ID: 1000164655
Veranstaltung 10th International Symposium on Turbulence, Heat and Mass Transfer (THMT 2023), Rom, Italien, 11.09.2023 – 15.09.2023

Volltext §
DOI: 10.5445/IR/1000164655
Veröffentlicht am 09.01.2024
Seitenaufrufe: 82
seit 22.11.2023
Downloads: 35
seit 23.01.2024
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