@techreport{oai:jaxa.repo.nii.ac.jp:00042852,
 author = {松本, 聡 and 大高, 雅彦 and 夏井, 秀定 and 新井, 達也 and 依田, 真一 and Matsumoto, Satoshi and Otaka, Masahiko and Natsui, Hidesada and Arai, Tatsuya and Yoda, Shinichi},
 month = {Dec},
 note = {The first and clear experimental evidence for the transition from the steady to the oscillatory flow was presented by the non-contact temperature measurement of a molten tin surface and the surface flow visualization. The experimental study on thermocapillary convection of low Prandtl number fluid was carried out to understand transition behavior to oscillatory flow. The half-zone liquid bridge of molten tin was formed between hot and cold disks in high vacuum chamber (10(exp -5) Pa). The three radiation thermometers were used to measure the free surface temperature at a different azimuthal location at the same time. In addition, the temperature distribution at interface between liquid bridge and cold disk was measured by using very fine thermocouples to detect the transition point and to make clear the oscillation mode more precisely. It can be detected that the steady thermocapillary convection changes to oscillatory under certain condition. The effect of aspect ratio (L/r) on critical Marangoni number is investigated. The critical Marangoni number decreases with increasing the aspect number. This behavior agrees with numerical simulation done by Imaishi et al. qualitatively except for region of smaller aspect ration. The transducer with 3 x 3 LN element was made and checked its sensitivity. The sensor was verified the stability after heat treatment up to 500 C, which was same as actual thermocapillary experiment. The frequency band of oscillator was selected to get the clear echo signal. The optimal frequency was 6 to 14 MHz wide-band. The sphericity and surface roughness of Fe-Ni/SB were improved by an appropriate heat treatment technique on Ni plating process and by the organic additives to the Fe plating solution. The Fe plating rate was obtained. It was found that the thickness increased with time linearly. It could be verified that Fe and Ni plated Shirasu-balloons (Fe-Ni/SB) even in phi-0.1 mm reflected the ultrasonic., 資料番号: AA0045403006, レポート番号: NASDA-TMR-020026E},
 title = {Experimental study of thermocapillary flow in the half-zone liquid bridge of low Prandtl number fluid},
 year = {2002}
}