Wake structures of two side by side spheres in a tripped boundary layer flow

• Published in: EPJ Web of conferences Vol. 67; pp. 2014 - 1-02014-11
• Main Authors: Canli, Eyüb, Özgören, Muammer, Dogan, Sercan, Hilmi Aksoy, Muharrem, Akilli, Huseyin
• Format: Journal Article
• Language: English
• Published: EDP Sciences 01.01.2014
• Subjects: Boundary layer; Boundary layer flow; Flat plates; Fluid dynamics; Fluid flow; Small scale; Wakes; Wire
• ISBN: 9788026053750; 8026053753
• ISSN: 2100-014X; 2100-014X
• DOI: 10.1051/epjconf/20146702014

Two independent spheres were placed in a side by side arrangement and flow structure in the wake region of the spheres was investigated with a Particle Image Velocimetry (PIV) system when the spheres were in a boundary layer over a flat plate as a special case. Reynolds number was 5000 based on the sphere diameter which was 42.5 mm. Boundary layer was tripped 8mm away from the leading edge of the flat plate with a 5 mm trip wire. The thickness of the hydro-dynamically developed boundary layer was determined as 63mm which was larger than the sphere diameter of D=42.5mm. The instantaneous vorticity fields of the side by side arrangements comprised wavy structures in higher level comparing to an individual sphere case. The gap flow intensifies the occurrence of small scale eddies in the wake region. The submersion rate of the spheres actually determines the characteristics of the wake region and is affected from boundary layer flow in a gradually decreasing manner.