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Effect of Inclination on Vortex Shedding Frequency Behind a Bent Cylinder: An Experimental Study

1
Escuela Superior Politécnica del Litoral, ESPOL, Facultad de Ingeniería en Mecánica y Ciencias de la Producción, Campus Gustavo Galindo Km 30.5 Vía Perimetral, P.O. Box 09-01-5863, Guayaquil, Ecuador
2
School of Mechanical, Aerospace and Civil Engineering, University of Manchester, George Begg Building, Sackville Street, Manchester M1 3BB, UK
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Author to whom correspondence should be addressed.
Fluids 2019, 4(2), 100; https://doi.org/10.3390/fluids4020100
Received: 16 May 2019 / Accepted: 29 May 2019 / Published: 31 May 2019
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Abstract

This paper presents experimental results on the vortex shedding frequency measured behind a bent cylinder. Experiments were conducted in a wind tunnel covering Reynolds numbers between 50 and 500, a range of interest for flow sensing, flow control, and energy harvesting applications. The bent cylinder comprised a vertical leg always oriented at normal incidence with respect to the free-stream flow, and an inclined leg whose inclination was varied during the tests between 90° and 15°. The bent cylinder was oriented in the wind tunnel with the vertical leg upstream and the inclined leg downstream, and the vortex shedding frequency was measured with hot-wire anemometry at several locations behind the inclined leg. The present bent cylinder design improves upon those previously considered by providing a finer control on the upstream boundary condition acting upon the inclined leg, which in the present design is not affected by the yaw angle of the inclined leg. With the exception of free-end effects, only noticeable for certain inclinations and Reynolds number values, inclination effects were surprisingly not observed, and the frequency of vortex shedding measured behind the inclined leg of the bent cylinder was consistent (within a few percent) with the cross-flow vortex shedding frequency at the same flow velocity. The present results corroborate and significantly extend the limited observations on bent cylinders available in the literature, further highlighting the importance of the upstream boundary condition on the vortex shedding process with inclined cylinders. View Full-Text
Keywords: vortex shedding; frequency; bent cylinder; inclined cylinder; yaw angle; experiment; hot-wire anemometry; flow sensing; flow control; energy harvesting vortex shedding; frequency; bent cylinder; inclined cylinder; yaw angle; experiment; hot-wire anemometry; flow sensing; flow control; energy harvesting
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Silva-Leon, J.; Cioncolini, A. Effect of Inclination on Vortex Shedding Frequency Behind a Bent Cylinder: An Experimental Study. Fluids 2019, 4, 100.

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