Relationship between Applied Static Magnetic Field Strength and Thermal Conductivity Values of Molten Materials Measured Using an EML Technique

概要

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In order to investigate quantitatively the effect of convection in an electromagnetically levitated molten droplet on the thermal conductivity of liquid iron measured by the electromagnetic levitation (EML) technique superimposed with a static magnetic field, the numerical simulations for melt convection in the droplet and sequentially for the measurement of thermal conductivity based on periodic laser heating method were carried out. In addition, the thermal conductivity of molten iron was measured by the EML technique, and then compared with those obtained numerically. As a result, the numerical simulations could sufficiently explain the measurement of thermal conductivity by the EML technique under a static magnetic field. Also, it was suggested that a static magnetic field of 10 T is enough to measure the real thermal conductivity of molten iron by the EML technique. Moreover, the correlation between a static magnetic field and the contribution of melt convection to the measured thermal conductivity was investigated using the nondimensional parameter which is the ratio of the electromagnetic force caused by the static magnetic field to that caused by the alternating current in RF coils.
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