201 The Study on Flow over a Sphere at Diverging Entrance Funnel
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In order to investigate the relation between a flow structure and a sphere behavior in a diverging funnel, an observation of the sphere behavior and flow visualization in the diverging runnel by the laser light sheet method were carried out. The sphere behavior could be classified into two categories i.e., pattern (a): the sphere lifts toward the flow direction with a rotation, and pattern (b): the sphere lifts with a rotation also a revolution along the cannel wall. The sphere lift distance decreases as the funnel angle increases and the sphere weight gains. The time delay, which the cease of the sphere motion takes since the mainstream stops, depends on the kinetic energy of the sphere, the gravity of the sphere and the resistance force acting on the sphere that are increase as the sphere size increases, respectively.
