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Global Friction of Uniform vs. Heterogeneous Sandpaper Roughness

Von Deyn, Lars H. ORCID iD icon 1; Stroh, Alexander 1; Gatti, Davide 1; Frohnapfel, Bettina ORCID iD icon 1
1 Institut für Strömungsmechanik (ISTM), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Skin-friction measurements of streamwise aligned sandpaper strips are presented in Nikuradse-type di-agrams obtained in a dedicated experimental facility.
These novel results shed light onto the global friction drag of heterogeneous rough surfaces. They indicate the drag-increasing presence of secondary motions known
to exist over spanwise heterogeneous roughness. The Reynolds number dependency of the skin-friction coef-ficient appears to be a superposition of the smooth wall and homogeneous rough wall behavior. The results sug-gest that the present heterogeneous rough surface does not reach a fully rough behavior in which the friction co-efficient becomes independent of Reynolds number.


Preprint §
DOI: 10.5445/IR/1000150166
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 22.07.2022
Sprache Englisch
Identifikator KITopen-ID: 1000150166
Erschienen in Proceedings of Turbulence and Shear Flow Phenomena Conferences
Veranstaltung 12th International Symposium on Turbulence and Shear Flow Phenomena (TSFP 2022), Ōsaka, Japan, 19.07.2022 – 22.07.2022
Seiten 6 S.
Schlagwörter roughness, fuild mechanics, turbulence
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