Oscillation analysis of an electromagnetic levitated droplet for determination of its surface tension(Physics, Processes, Instruments & Measurements)

概要

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Shape changes in a levitated droplet dominate the surface oscillation mode, and affect the apparent surface tension value of the droplet. The effect of those changes was investigated using the electromagnetic levitation method under microgravity conditions. The microgravity conditions were produced with a drop shaft system at JAMIC (Japan Microgravity Center). All experiments were carried out in an atmosphere of purified Ar-3%H_2 gas. The sample temperature was measured with a two-color pyrometer, and all samples were weighed before and after the experiments. Surface oscillations of a droplet were recorded with two high-speed video cameras. Measured images were analyzed by digital image processing. The coil system consists of a positioning coil and heating coil, which generate quadru-poles and di-poles respectively. The equilibrium shape of the droplet can be controlled by changing the current ratio for the coils. Consequently, it has become clear that even a small change in the equilibrium shape affects the distribution of oscillation frequencies.
大阪大学の論文