Abstract
Using an axis-symmetric model comprising a flat reflector with a hole and a piston vibrator, we simulate the radiation force acting on a small object levitated near the hole, and predict that the position of the object shifts from the center line of the hole. We also experimentally investigate the behavior of a levitated polystyrene sphere approaching the hole. As predicted, the sphere avoids approaching the hole with some distance, depending on the reflector/vibrator interval and the hole diameter. We believe that this effect is useful in discriminating the droplets to be dispensed from those that should not be dispensed.
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