Abstract
In this paper local swirl stream around a glass needle is analyzed. The local stream is generated by circular vibration of the glass needle, which is actuated by one piezoelectric actuator. At first we observed the motion of the glass needle in water when swirl stream is generated around the glass needle. From this experiment we confirmed that the glass needle's motion is circular. Then we analyzed the stream around the glass needle in 3 dimension using micro beads. We confirmed two facts: the bigger the radius is, the smaller the angular velocity and the velocity toward the root of the needle are, and the bigger the amplitude and the frequency are, the bigger the angular velocity and the velocity toward the root of the needle are. This phenomenon and analysis can be used for non-contact manipulation of micro objects.
