Abstract
A water droplet injected into silicone oil, to which uniform electric field is applied by use of a pair of electrode plate, reciprocates colliding alternately with each electrode plate. This paper proposes to use the collision to augment initiation of freezing nucleation of super-cooling water droplet, and deals with the characteristics of the phenomena. The shuttle migration of a droplet between electrodes and initiation of freezing is photographed by use of a video camera, and the phenomena are analyzed on a monitor. As a result, the freezing initiation of the droplet is observed while the droplet is touched to the negative electrode plate. Relative frequency of the initiation is shown by the super-cooling degree and the electric field strength. The upper limitation of the temperature at which all sample droplets initiate to freeze is -3°C. Characteristics of the initiation are clarified and the effectiveness of this method is shown.
