315 旋回流中の配向棒状物体周囲の流れの可視化(S42-2 流れの可視化実験解析(2),S42 流れの可視化実験解析)  [in Japanese] 315 Visualization of Swirling Flow around Rod-like Material for Orientation  [in Japanese]

Two kinds of swirling flow are generated in a main vertical pipe by using two kinds of air inlets. A rod-like material is put into the main vertical pipe. Four optical sensors are attached to the main vertical pipe. When the rod-like material is sensed by the four optical sensors, laser sheet is irradiated and the image is obtained by 3D-PIV. It means the posture of the rod-like material is upright and rotating with orientation. However, when the rod-like material is sensed by the two optical sensors, it means the posture of the rod-like material is not upright and rotating without orientation. Two images obtained by the above-mentioned were compared to derive the condition for the rod-like material to rotate at the constant height in the main vertical pipe, and the flow field around the rod-like material is analyzed.