Reduction of Drag Force on a Circular Cylinder and Pressure Drop Using a Square Cylinder as Disturbance Body in a Narrow Channel

Abstract:

Many studies related with characteristics of fluid flow acrossing in a bluff body have been conducted. The aim of this research paper was to reduce pressure drop occuring in narrow channels, in which there was a circular cylindrical configuration with square cylinder as disturbance body. Another goal of this research was to reduce the drag force occuring in circular cylinder. Experimentally research of flow characteristics of the wind tunnel had a narrow channel a square cross-section, with implemenred of Reynolds number based on the hydraulic diameter from 5.21x10⁴ to 1.56x10⁵. Wind tunnel that was used had a 125x125mm cross-sectional area and the blockage ratio 26.4% and 36.4%. Specimen was in the form of circular cylinder and square cylinder as disturbance body. Variation of angle position was the inlet disturbance body with α = 20⁰, 30⁰, 40⁰, 50⁰ and 60⁰, respectively. The results was obtained from this study was Reynolds Number value was directly linear with pressure drop there, it was marked by increasing of Reynolds number, the value was also increasing pressure drop. Additional information was obtained by adding inlet disturbance body shaped of square cylinder on the upstream side of the circular cylinder that could reduce pressure drop in the duct and reduce drag happening on a circular cylinder. The position of the optimum angle to reduce pressure drop and drag force was found on the inlet disturbance body with angle α = 30⁰.

• Periodical: Applied Mechanics and Materials (Volume 493)
• Pages: 192-197
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.493.192
• Online since: January 2014
• Authors: Wawan Aries Widodo, Randi Purnama Putra
• Keywords: Drag Force, Narrow Channel, Pressure Drop, Square Cylinder

References

[1] Bearman P.W., & Morel T. Effect of Free Stream Turbulence on the Flow Around Bluff Bodies, Department of Aeronautics, Imperial College, London, UK. (1984).

[2] Ozgoren, M. Flow Structure in the Down Stream of Square and Circular Cylinders, Selcuk University, Faculty of Engineering and Architecture, Departement Mechanical of Engineering, Turkey. (2005).

[3] Alam, M.D., Sakamoto. H., Moriya, M. Reduction of fluid forces acting on a single circular cylinder and two circular cylinders by using tripping rods. Journal of Fluids and Structures 18, (2003), 347–366.

DOI: 10.1016/j.jfluidstructs.2003.07.011

[4] Daloglu, A. Pressure drop in a channel with cylinder in tandem arrangement, International Comunication in Heat and Mass Transfer 35, (2008), 76-83.

DOI: 10.1016/j.icheatmasstransfer.2007.05.011

[5] Weidman, P.D. Tesis: Wake Transition and Blockage Effect on Cylinder base Pressure, California Institute of Technology, Pasadena. (1968).

[6] Bell, W.H. Turbulence vs Drag – some further consideration, Ocean Engineering 10, (1983), 47-63.

DOI: 10.1016/0029-8018(83)90039-2