Abstract
An electrostatic levitation technique is a promising method to measure physical properties of extremely high melting temperature materials, since it can avoid the effect of container. Previously, surface tension and viscosity have been calculated by an oscillating drop method based on linear approximations. However, the actual levitating drop includes nonlinear effects on the oscillation. For highly precise measurements, nonlinear effects should be taken into account. In the present study, the oscillatory motion and rotating drop of levitated drop is experimentally investigated to clarify the nonlinear effect. From the experimental results, it is clarified that the resonance frequency becomes smaller as the oscillation amplitude is larger. But, on the rotating drop, resonance frequency becomes larger as the rotation speed is increased. The result indicates that the large-amplitude oscillation includes the effect of nonlinear oscillation.
