Measuring equipment for thermophysical properties of droplet electromagnetically-levitated under axial static magnetic field

Paper number

IAC-05-A2.3.05

Author

Mr. Fumitomo Onishi, The Graduate University of Advanced Studies, Japan

Year

2005

Abstract

An electromagnetic levitator (EML) is used for measurement of thermophysical properties melt with high melting point and with high reactivity. However, it is well-known that unstable convection and vibration are usually observed on a surface of the melt levitated by the method.
Application of a strong static magnetic field is considered to be a promising method to damp convection and motion in electrically conductive fluid, because the Lorentz force is induced by the magnetic field. Therefore, a novel measuring equipment for thermophysical properties of an electrically conductive droplet has been developed to solve the problem mentioned above based on the principle.
In order to observe behavior and shape of melt three-dimensionally and in realtime, a high-speed camera and a CCD camera were mounted at the top and side of a reaction chamber of EML, respectively. Surface temperature of the melt was monitored by a pyrometer from the side. Al-doped Si and pure Ti droplets with 9 mm in diameter were successfully levitated under an axial static magnetic field from 1 to 6 T.
As a result, vibrations of Si and Ti droplets levitated by the equipment was stabilized and the convection was seemed to be damped under the magnetic field, though the droplets rotated along the magnetic field as rigid bodies. Precession movements of the droplet were weakened as the strength of the field increased. Some obtained results for thermophysical properties of the droplets will be reported.

Abstract document

IAC-05-A2.3.05.pdf

Manuscript document

IAC-05-A2.3.05.pdf (🔒 authorized access only).

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