抄録
PIV measurements were conducted for the development of the withdrawal current of viscoelastic fluid induced by a line sink between parallel walls. The experiments were performed in a rectangular reservoir 700 mm long, 50 mm wide, and filled with a worm-like micellar fluid to a depth of 100 mm. The line sink was located at mid-depth. It is observed that the startup of discharge gives birth to a counter rotating vortex pair moving out from the sink. These results suggest the propagation of columnar disturbance modes responsible for the development of flow concentration in the withdrawal region.
