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Secondary flow impact on velocity and thermal fields of a structured turbulent channel flow

Stroh, A.; Schafer, K.; Forooghi, P.; Frohnapfel, B.

Abstract:
Surface structuring in form of streamwise elongated triangular ridges is investigated in a framework of a fully developed turbulent channel flow at Reb = 18000. The ridges generate a strong large-scale secondary motion and hence alter momentum and heat transfer in the channel. A comparison of the obtained skin friction and heat transfer coefficients reveals a 30% enhancement for both quantities relatively to the smooth channel. Tripe decomposition analysis of the total stress and heat flux results in an observation of different mechanisms behind this enhancements: while the skin friction coefficient is mainly increased by the secondary-motion-related contribution, the heat flux is similarly enhanced by the secondary motion and modification of turbulent properties of the flow.

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Preprint §
DOI: 10.5445/IR/1000097957
Veröffentlicht am 09.09.2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Publikationstyp Proceedingsbeitrag
Jahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000097957
Erschienen in Proceedings of 14th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Wicklow, IR, July 22-24, 2019
Veranstaltung 14th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT 2019), Wicklow, Irland, 22.07.2019 – 24.07.2019
Vorab online veröffentlicht am 21.08.2019
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