2309 液晶高分子の二次元流路内での流動方向変化時の不安定挙動(S42-2 複雑流体の流動現象(2),S42 複雑流体の流動現象)  [in Japanese] 2309 Unstable Behavior of Liquid Crystalline Polymer Solution in Two-Dimensional Channels with a Flow Directional Change  [in Japanese]

The instability of flow induced structure of liquid crystalline polymer solution has been investigated in two dimensional channel flows. The influence of round off curvature at a corner on the unstable behavior after a flow direction change has been mainly examined. The orientation angle and the dichroism were measured with a laser optical measurement system. The unstable behavior of liquid crystalline polymer solution has typical periodic oscillatory characteristics, and the periodic motion became larger toward the downstream from the corner. The increase in periodicity was significant at the inner side of the channel. The larger round off of the corner suppressed the periodic motion, so that it is considered that the shape of the corner is one of the causes of the instability.