Influence of Sample Size on the Viscosity Measurement of Molten Metals with an Electrostatic Levitation Method

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  • 静電浮遊法を用いた粘性係数測定における試料サイズの影響
  • セイデン フユウホウ オ モチイタ ネンセイ ケイスウ ソクテイ ニ オケル シリョウ サイズ ノ エイキョウ

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When the viscosity of liquid materials is measured by the oscillation drop method, it is assumed that no exernal field is present and that the oscillation is damprd only by the viscosity of the sample. In real exoeriments, some external forces are applied to the sample in order to levitate and maintain the sample position. In the case of electrostatic levitation, huge electric fields and a feedback loop are necessary to levitate a sample in 1-G. Until now, the effect of the electric field on the viscosity measurement has not been verified. In this study, viscosity measurements with sifferent sample size are conducted using a ground based electrostatic (ESL) to investigate possible effects. The experimental results clearly show that an additional damping, associated with the levitatiing electrical field, becomes more significant as sample becomes larger.

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