TITLE:
Visualization of a Laminar Necklace Vortex System in Front of a Vertical Rectangular Plate on a Ground Wall
AUTHORS:
Yasuhiro Nakahara, Hidemi Yamada
KEYWORDS:
Flow Visualization, Necklace Vortex System, Rectangular Plate, Laminar Boundary Layer
JOURNAL NAME:
Journal of Flow Control, Measurement & Visualization,
Vol.3 No.2,
April
15,
2015
ABSTRACT: Various properties of a necklace vortex system formed around a rectangular plate standing vertically on a flat ground wall were investigated by visualizations produced by injecting fluorescent dye into a water channel flow. As a result, it was found that the necklace vortex pattern had three steady systems depending on the Reynolds number Reh, the relative height h/δ of the rectangular plate compared with the laminar boundary layer thickness and the aspect ratio w/h. As it is expected that the aspect ratio of the rectangular plate will typify the projected area configuration of various three-dimensional bodies, the aspect ratio is varied widely from 0.5 to 7.0. The transitional boundaries of Reh and h/δ in the 2-vortex, 4-vortex and 6-vortex systems for each aspect ratio decreased when w/h