Surface Tension and Viscosity Measurement of highly Viscous Melts using a Sample Rotation

Int. J. Microgravity Sci. Appl. 2015p320106
Author
T. ISHIKAWA, J. OKADA, P.-F. PARADIS, Y. WATANEBE and M. WATANABE
Organization
Japan Aerospace Exploration Agency, The Graduate University for Advanced Studies (SOKENDAI), Advanced Engineering Services Co., Ltd., Gakushuin University
Abstract
In order to measure the surface tension and viscosity of high temperature melts with high viscosity, a method using sample rotation is developed. An electrostatically levitated melt was spun with a rotating magnetic field, and the shape evolution of the sample was observed. Especially, the bifurcation behavior was closely monitored by a high speed camera. The experiments confirmed that the rotation frequency at the bifurcation could be precisely measured by monitoring the fluctuation of the power of the He-Ne laser reflected at the sample surface, and thus, the surface tension could be calculated based on the theory. As for the viscosity measurements, preliminary experiments showed that the speed of the shape evolution after the bifurcation was related to the viscosity of the sample.
Keyword(s)
Levitation, Rotation, Surface tension, Viscosity
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