@techreport{oai:jaxa.repo.nii.ac.jp:00039840,
 author = {清水, 盛生 and 楠瀬, 智宏 and 東, 久雄 and 松本, 甲太郎 and 上村, 平八郎 and 吉原, 正一 and 井村, 貞治 and 末続, 靖 and 熊谷, 司 and 山田, 一晴 and Shimizu, Morio and Kusunose, Tomohiro and Azuma, Hisao and Matsumoto, Kotaro and Kamimura, Heihachiro and Yoshihara, Shoichi and Imura, Sadaji and Suetsugu, Yasushi and Kumagai, Tsukasa and Yamada, Kazuharu},
 month = {Jan},
 note = {マランゴニ対流は表面張力の差に起因するので、特に微小重力環境下におけるこのような対流を調べ、高級・均一組成合金の製造時での効果を評価することは重要である。そこで、微小重力環境下における表面張力(マランゴニ対流についての重要な物性値として)の測定技術開発のため、航空機のパラボリックフライトによる微小重力実験を行った。本実験では、球状音響浮遊装置を用いて液滴を浮遊・振動させ、この状態での固有振動数を測定し、液滴の表面張力を算出した。この結果、音響浮遊にサポートワイヤを組み合わせることにより、液滴の位置保持とレーザ式外径測定器による液滴径の測定が可能となった。本実験では、充分な信頼性を有する固有振動数の測定値が得られず、本手法の有効性の確認はできなかった。しかしながら、より適切な実験試料の選択と外径測定装置の改良により、本測定技術を用いる表面張力の計測が有望である。, As the Marangoni convection is governed by a difference in the surface tension, especially in microgravity environment, it is very important to examine the phenomenon of such a convection and evaluate its effects on alloys with high-grade and homogeneous composition, when carrying out experiments on the production of alloys. Therefore, a microgravity experiment in a parabolic flight, in order to develop technology for measuring the surface tension (as an important physical property value in connection with the Marangoni convection) in the microgravity environment was conducted. In the experiment, a droplet within spherical acoustic levitation equipment was levitated and the method of calculating the surface tension based on the proper frequency was adopted which is obtained by measuring the vibration of such a liquid droplet. As a result of this experiment, it was possible to retain the position of the droplet and to measure the variation in the diameter of this levitating droplet using a measuring instrument utilizing laser beam, by combining the acoustic levitation equipment with the help of a supporting wire. In the experiment, It was unable to measure a highly reliable proper frequency or to confirm the effectiveness of this measuring technology. However, the possibility of measuring the surface tension using the measuring technology is encouraging, as a result of selecting a proper experimental liquid and improving the outside diameter measuring instrument., 資料番号: AA0000738003, レポート番号: NASDA-TMR-960021},
 title = {微小重力環境下における物性値の測定　第2報},
 year = {1997}
}