Bénard-Marangoni对流温度振荡转捩实验研究

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基金项目: 国家自然科学基金重点基金;国家自然科学基金面上项目;三期创新方向性项目

Experimental investigation of the transition of temperature oscillation in Bénard-Marangoni convection

1.
The National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
2.
The College of Science, Northeastern University, Shenyang 110004, China

摘要: 主要通过实验观测Bénard-Marangoni对流中存在的温度振荡现象, 研究了温度振荡的起振临界Ma数, 以及初步探讨了温度振荡随Ma数增加的转捩过程.实验结果表明不同物性参数的硅油温度振荡临界Ma数满足同一临界条件. 不同的物性参数的介质表现出不同的温度振荡转捩过程, 但同一物性参数不同厚度的介质表现相同的振荡规律. 此外, 还用粒子迹线法观察了流场结构及转捩过程.
- 对流斑图
Abstract: In this paper, temperature oscillation is found in theexperiment. The experimental research focus on the critical Ma number ofonset of temperature oscillation, and discuss the transition of temperatureoscillation as the Ma increase. The experiment result shows that onset oftemperature oscillation in silicon oil with different physical propertiesmeet the same law. The super critical temperature oscillation showsdifferent transition routes in the different fluid, but the same route isperformed in the same fluid with different depths. Besides, convectionpattern and its transition are studied by particle trace method.
- convection pattern