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Influence of slip on vortex-induced motion of a superhydrophobic cylinder |
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| Affiliation: | 1. CRIACIV/Department of Civil and Environmental Engineering, University of Florence, Via S. Marta 3, 50139 Florence, Italy;2. Department of Civil and Environmental Engineering, University of Florence, Via S. Marta 3, 50139 Florence, Italy;3. Institute of Aeroelasticity, German Aerospace Center (DLR), Bunsenstraße 10, 37073 Göttingen, Germany;1. School of Mechanical Engineering, Shandong University, Jinan 250061, China;2. Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, Jinan 250061, China;1. Institut de Mécanique des Fluides de Toulouse, IMFT- UMR CNRS 5502, France;2. ICUBE, Laboratoire des sciences de l׳ingénieur, de l׳informatique et de l׳imagerie, Université de Strasbourg, UMR CNRS 7357, France;1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, China;2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, China |
| Abstract: | The partial slip boundary condition produced by a superhydrophobic surface in the Cassie state has been shown capable of reducing skin friction drag as well as influencing the flow around coated bodies including cylinders and spheres. In this paper, we investigated how the changes in vortex shedding and separation previously observed on superhydrophobic cylinders affects the rms lift force and the resulting oscillations induced on an elastically mounted cylinder. Two hydrophobic polytetrafluoroethylene cylinders were studied. The first was smooth and the second was roughened to make it superhydrophobic and to induce slip. The presence of slip was found to decrease rms lift and amplitude of the oscillating cylinder by up to 15% with no measurable impact on drag or the natural frequency of the elastically mounted system. We show that the observed reductions are a direct result of reduced fluid forcing on the superhydrophobic cylinder. |
| Keywords: | Superhydrophobic Ultrahydrophobic Superhydrophobicity Slip Partial slip Drag reduction Vortex Cylinder |
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