回転を考慮した液滴振動法による表面張力と粘性係数の解析

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  • Analysis of Surface Tension and Viscosity by Oscillation Drop Method Including Sample Rotation Effects
  • カイテン オ コウリョシタ エキテキ シンドウホウ ニ ヨル ヒョウメン チョウリョク ト ネンセイ ケイスウ ノ カイセキ

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We precisely analyzed the surface tension and the viscosity of Ni-Al and Ti-Al melts by the oscillation drop method including droplets rotation effects. Under microgravity conditions, beat-like radius variations due to drop method were pbserved on the oscillating droplets in electromagnetic levitation (EML) experiments. The beat-like radius variation prevents to evaluate the surface tension and the viscosity, thus we need to solve the problem about droplet rotation for obtaining the correct surface tension and viscosity. From this purpose, we performed numerically simulation of three-dimensional droplet shap with rotation, surface oscillation by the surface tension and its damping by the viscosity. From the simulation result, we proposed analytical technique to exaluate surface tension and viscosity from the beat-like radius variations of surface oscillating dloplet with rotations. We applied the technique into the oscillating drop date of Ni-Al and Ti-Al melts obtained by EML experiments using TEMPUS under microgravity conditions on board parabolic flights. As a result, it was confirmed that the surface tension snd viscosity were precisely determined even undersroplet rotating conditions.

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