Surface tension and viscosity measurements of highly viscous melts using drop rotation

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360086
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Japan Aerospace Exploration Agency
• Principal Investigator: ISHIKAWA Takehiko 独立行政法人宇宙航空研究開発機構, 宇宙科学研究所, 教授 (00371138)
• Co-Investigator(Kenkyū-buntansha): OKADA Junpei 宇宙航空研究開発機構, 宇宙科学研究所, 助教 (90373282)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 表面張力 / 粘性係数 / 高温融体 / 浮遊 / 液滴ダイナミクス

Outline of Final Research Achievements

Aim of this research is to establish a new method to measure surface tension and viscosity of highly viscous melts combined with containerless techniques. This measreument will be useful for the research of bulk metalic glasses. By employing a high speed camera, bifurcation phenomena from axisymmetric to non-axisymmetric shape were observed on electrostatically levitated rotating drops.
It was confirmed that the bifurcation occurs at theoretically predicted rotation rate, and surface tension can be obtained by measureing rotation rate. It was also confirmed that the shape evolution speed after the bifurcation depends on the viscosity of the sample. This result shows a possiblity of quantitative viscosity measurement of highly viscous melts using a drop rotation.

Free Research Field

高温融体熱物性計測