Original title: Effect of Cylinder Roughness on Strouhal Number
Authors: Yanovych, Vitalii ; Duda, D. ; Uruba, Václav ; Procházka, Pavel P. ; Antoš, Pavel
Document type: Papers
Conference/Event: Topical Problems of Fluid Mechanics 2022, Prague (CZ), 20220216
Year: 2022
Language: eng
Abstract: The main goal of this paper is to establish a better understanding of the relationship between a Strouhal number and surface roughness. Hot-wire anemometry was used to evaluations the characteristics of turbulent flow behind circular cylinders with different relative roughness 0% (smooth surface) 0.83%, 1.67%, 3.33%, and 6.67%. At the experimental investigation, the Reynolds number based on the cylinder diameter was 5 × 103 < Red < 2 × 104. The obtained data showed that the Strouhal number decreased with increasing roughness. While, the dissipation rate decreases, and the value of the Kolmogorov and Taylor microscales increases. Also, spectral analysis of streamwise velocity fluctuations allowed us to estimate the location of the vortex-shedding frequency which at growing roughness tends to reduce.
Keywords: Hot-wire anemometry; roughened cylinder; spectral distribution; Strouhal number; turbulence structure
Project no.: TH02020057 (CEP)
Funding provider: GA TA ČR
Host item entry: Proceedings of Topical Problems of Fluid Mechanics 2022, ISBN 978-80-87012-77-2, ISSN 2336-5781

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: http://www2.it.cas.cz/fm2015/im/admin/showfile/data/my/Papers/2022/27-TPFM2022.pdf
Original record: https://hdl.handle.net/11104/0351828

Permalink: http://www.nusl.cz/ntk/nusl-541548


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