An experimental investigation into the drag reduction performance of dimpled plates in a fully turbulent channel flow
İlter, Yasin Kaan and Ünal, Uğur Oral and Shi, Weichao and Tokgöz, Sedat and Atlar, Mehmet (2024) An experimental investigation into the drag reduction performance of dimpled plates in a fully turbulent channel flow. Ocean Engineering, 307. 118198. ISSN 0029-8018 (https://doi.org/10.1016/j.oceaneng.2024.118198)
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Abstract
Dimpled surfaces have gained increasing attention in recent years for their potential to reduce turbulent skin friction, a capability previously acknowledged for its beneficial implications on heat transfer. As a passive drag reduction method, dimpled surfaces offer significant advantages for marine applications due to their effectiveness and practical applicability. However, despite numerous studies, conflicting opinions and inconsistent drag reduction rates persist in the literature. This paper addresses these ambiguities and offers valuable insights into the effectiveness of dimpled surfaces for drag reduction in fully turbulent flows. We conducted an extensive experimental investigation involving various dimple configurations, including different depth-to-diameter ratios, diameters and orientations, utilising a specialised Fully Turbulent Flow Channel facility and a Particle Image Velocimetry system. Our findings demonstrated that circular dimple geometries, particularly those with low depth ratios, can achieve significant drag reduction of up to 27% as the Reynolds number increases. These results highlight the substantial potential of dimpled surfaces for improving energy efficiency in marine applications, where skin friction accounts for a significant portion of the total drag experienced by large vessels.
ORCID iDs
İlter, Yasin Kaan ORCID: https://orcid.org/0000-0001-6613-2944, Ünal, Uğur Oral, Shi, Weichao, Tokgöz, Sedat and Atlar, Mehmet;-
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Item type: Article ID code: 89347 Dates: DateEvent1 September 2024Published20 May 2024Published Online13 May 2024AcceptedSubjects: Naval Science > Naval architecture. Shipbuilding. Marine engineering Department: Faculty of Engineering > Naval Architecture, Ocean & Marine Engineering
Strategic Research Themes > Ocean, Air and SpaceDepositing user: Pure Administrator Date deposited: 23 May 2024 10:57 Last modified: 14 Dec 2024 01:38 URI: https://strathprints.strath.ac.uk/id/eprint/89347