@techreport{oai:jaxa.repo.nii.ac.jp:00042534, author = {鴨谷, 康弘 and Wang, L. and 八田, 明香 and Bhunia, P. and 依田, 真一 and Kamotani, Yasuhiro and Wang, L. and Hatta, Sayaka and Bhunia, P. and Yoda, Shinichi}, month = {Dec}, note = {The effect of surrounding air motion on oscillatory thermocapillary flows is studied experimentally. Thermocapillary flows in liquid bridges and circular containers are investigated. The air motion is due to the natural convection of air caused by the heating-cooling arrangement of the experiment and also due to the forced convection associated with the motion of the liquid free surface. The air motion is varied in the present experiment by changing the cold wall temperature relative to the ambient air temperature. It is shown that in certain configurations the hot wall temperature at the onset of oscillations remains nearly unchanged when the cold wall temperature is varied over a wide range, which results in a substantial change in the critical Marangoni number (Ma(sub cr)). In order to understand this unusual effect in detail, the air motion is simulated numerically, which shows a relatively weak air motion along the liquid free surface. It is shown that the overall air motion is dominated by natural convection in the liquid bridge configuration and by forced convection in the circular container configuration. The relation between Ma(sub cr) and the free surface heat loss caused by the air motion is discussed., 資料番号: AA0032601001, レポート番号: NASDA-TMR-010015E}, title = {Study of oscillatory thermocapillary flow of high prandtl number fluid}, year = {2001} }