抄録
In a T-junction mixing part of two fluids without the temperature differnce, the behavior of a jet flow was examined in the case of the flow with a obstacle. The flow was visualized by dystuff and vorticity obtained base on the velocity field by PIV. There was controlling effect of the vortex in case of the main fast flow velocity when the obstacle is put on the downstream place from the branching tubule. When the obstacle is put on the upstream part of branching tuble, it is understood that the vortex is generated away from the wall.
