Control of circular cylinder wakes in shallow flow

By placing different splitter plates at various locations downstream of a vertical cylinder, the control of vortex shedding behind the cylinder was aimed. The cylinder having outer diameter of 50 mm was used for all experiments. The plate thickness was chosen constant as 4mm. On the other hand, the length of the plate was ranged from 25 mm to 100 mm with 25 mm increments. The heights of plates were 6.25 mm, 12.5 mm and 18.75 mm. The gap between the base of cylinder and the leading edge of the splitter plate was ranged from 0 to 100 mm with 12.5 mm increments. The experiments consisted of two main parts. The splitter plate was placed on to the platform in accord with the cylinder in the water channel and the effect of plate location and plate height on the flow characteristics were investigated in the first part. At the second part of experiments, the splitter plates were hung at different distances from the platform. All experiments were carried out in shallow water having 25 mm water height. Particle Image Velocimetry (PIV) technique was used to measure instantaneous velocity vector field in the wake region at Reynolds number based on cylinder diameter Re=5000.