Aspect-ratio dependent oscillatory thermocapillary convection in the floating half zone

摘要：

The dependency of the critical Marangoni number on the geometrical aspect ratio of the floating half zone is essential to predict the onset of oscillatory thermocapillary convection. The experimental studies in the microgravity conditions on floating half zones of several centimeters in diameter have predicted that the critical Marangoni number increases with the increasing aspect ratio, and the terrestrial experimental studies have predicted the contradictory conclusion for floating half zones of several millimeters in diameter. In the present work, terrestrial experimental studies were conducted on the floating half zones of 5 Centistokes (cSt) silicon oil and 10 cSt silicon oil. The experimental results show that the critical Marangoni number generally increases with the increasing aspect ratio of the floating half zone and then decreases. Moreover, a further increase of the critical Marangoni number with the increasing aspect ratio occurs for the slender floating half zones.

关键词： thermocapillary convection flow instability aspect ratio

作者: AA Yan, LI Kai CAO ZhongHua HU WenRui

作者单位: Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences. Beijing 100190 China and National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

会议类型: 国际会议

会议名称: 原子核磁矩国际研讨会

会议地点: 北京

会议语种:英文

页码: 338-341

在线出版日期: 2010-04-27（万方平台首次上网日期，不代表论文的发表时间）