TWO BIFURCATION TRANSITION PROCESSES IN FLOATING HALF ZONE CONVECTION OF LARGER PRANDTL NUMBER FLUID

• 来源期刊: 力学学报（英文版）
• 学科: 物理学
• 年，卷（期）: 2002,（4）
• 页码范围: 328-341
• 页数: 14页
• 分类号: O3
• 语种: 英文

摘要

Processes of the onset oscillation in the thermocapillary convection under the Earth's gravity are investigated by the numerical simulation and experiments in a floating half zone of large Prandtl number with different volume ratio.Both computational and experimental results show that the steady and axisymmetric convection turns to the oscillatory convection of m ＝ 1 for the slender liquid bridge,and to the oscillatory convection before a steady and 3D asymmetric state for the case of a fat liquid bridge. It implies that, there are two critical Marangoni numbers related, respectively, to these two bifurcation transitions for the fat liquid bridge. The computational results agree with the results of ground-based experiments.