Downstream particle image velocimetry measurements of a circular cylinder—plate junction

• Published in: Proceedings of the Institution of Mechanical Engineers. Part C, Journal of mechanical engineering science Vol. 223; no. 8; pp. 1837 - 1849
• Main Authors: Ozturk, N A, Akcayoglu, A, Sahin, B
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.08.2009; SAGE PUBLICATIONS, INC
• Subjects: Acceleration; Circular cylinders; Core flow; Emission; Flow characteristics; Flow velocity; Fluid dynamics; Fluid flow; Horseshoe vortices; Particle image velocimetry; Planes; Plates (structural members); Reynolds number; Series (mathematics); Shear; Shear layers; Shedding; Simulation; Turbulent flow; Upstream; Velocity; Velocity measurement; Vortices; junction flows; particle image velo-cimetry; wake flow; horseshoe vortex; obstacle; circular cylinder
• ISSN: 0954-4062; 2041-2983
• DOI: 10.1243/09544062JMES1446

Abstract In the present investigation, special attention was given to the flow characteristics downstream of a circular cylinder mounted on a flat surface for Reynolds numbers of 4000 and 7000. A series of experiments were performed in successive end-view planes with the range of 0≤XL/ d≤5 using the particle image velocimetry (PIV) technique in order to demonstrate characteristics of wake flow structure and interactions between the shear layers caused by shedding vortices and tails of the horseshoe vortex system emanating from the upstream base of the cylinder. The development and growth of primary vortices in the end-view planes caused by the interactions of core flow and wake flow regions along the inner face of the shedding shear layers were examined quantitatively. Finally, it was concluded that the PIV technique was also capable of providing accurate velocity readings in the end-view planes of the wake flow regions.