円管内非定常流による粒子輸送

抄録

Particles transport in an unsteady flow is of great interest in physical or engineering subjects. In the present report, we consider particle deposition on the channel wall induced by a sudden deceleration, namely, rapid closure of the end of channel. For such case, the induced flow by the sudden suspension of inlet flow in a pipe was simulated, and particles transport was considered. Suspension of the inlet flow provides impulsive pressure gradient through the pipe. The impulsive pressure gradient plays a role of velocity potential reversively. The sudden stop of inlet and outlet generates a counter flow depending on velocity profile in Poiseuille flow. The counter flow provided vortex streets, then a breakdown of vortex has possibility to make particle deposit to the wall. So, we discussed the mechanisms of the flow induced by the sudden stop of the inlet flow and particles transport whom the breakdown of vortex may drive.