中国物理B ›› 2017, Vol. 26 ›› Issue (11): 114703-114703.doi: 10.1088/1674-1056/26/11/114703

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Instabilities of thermocapillary-buoyancy convection in open rectangular liquid layers

Huan Jiang(姜欢), Li Duan(段俐), Qi Kang(康琦)   

  1. 1. Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    2. School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2017-05-17 修回日期:2017-07-07 出版日期:2017-11-05 发布日期:2017-11-05
  • 基金资助:

    Project supported by the Strategic Priority Research Program on Space Science, Chinese Academy of Sciences:SJ-10 Recoverable Scientific Experiment Satellite (Grant Nos. XDA04020405 and XDA04020202-05), the China Manned Space Engineering program (TG-2), Cooperative Research Project between China and Russia, and the National Natural Science Foundation of China (Grant No. 11372328).

Instabilities of thermocapillary-buoyancy convection in open rectangular liquid layers

Huan Jiang(姜欢)1,2, Li Duan(段俐)1,2, Qi Kang(康琦)1,2   

  1. 1. Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    2. School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-05-17 Revised:2017-07-07 Online:2017-11-05 Published:2017-11-05
  • Contact: Li Duan, Qi Kang E-mail:duanli@imech.ac.cn;kq@imech.ac.cn
  • Supported by:

    Project supported by the Strategic Priority Research Program on Space Science, Chinese Academy of Sciences:SJ-10 Recoverable Scientific Experiment Satellite (Grant Nos. XDA04020405 and XDA04020202-05), the China Manned Space Engineering program (TG-2), Cooperative Research Project between China and Russia, and the National Natural Science Foundation of China (Grant No. 11372328).

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摘要：

This article presents the experimental investigation on instabilities of thermocapillary-buoyancy convection in the transition process in an open rectangular liquid layer subject to a horizontal temperature gradient. In the experimental run, an infrared thermal imaging system was constructed to observe and record the surface wave of the rectangular liquid layer. It was found that there are distinct convection longitudinal rolls in the flow field in the thermocapillary-buoyancy convection transition process. There are different wave characterizations for liquid layers with different thicknesses. For sufficiently thin layers, oblique hydrothermal waves are observed, which was predicted by the linear-stability analysis of Smith & Davis in 1983. For thicker layers, the surface flow is distinct and intensified, which is because the buoyancy convection plays a dominant role and bulk fluid flow from hot wall to cold wall in the free surface of liquid layers. In addition, the spatiotemporal evolution analysis has been carried out to conclude the rule of the temperature field destabilization in the transition process.

关键词: thermocapillary-buoyancy convection, instability, open rectangular liquid layer, spatiotemporal evolution

Abstract:

This article presents the experimental investigation on instabilities of thermocapillary-buoyancy convection in the transition process in an open rectangular liquid layer subject to a horizontal temperature gradient. In the experimental run, an infrared thermal imaging system was constructed to observe and record the surface wave of the rectangular liquid layer. It was found that there are distinct convection longitudinal rolls in the flow field in the thermocapillary-buoyancy convection transition process. There are different wave characterizations for liquid layers with different thicknesses. For sufficiently thin layers, oblique hydrothermal waves are observed, which was predicted by the linear-stability analysis of Smith & Davis in 1983. For thicker layers, the surface flow is distinct and intensified, which is because the buoyancy convection plays a dominant role and bulk fluid flow from hot wall to cold wall in the free surface of liquid layers. In addition, the spatiotemporal evolution analysis has been carried out to conclude the rule of the temperature field destabilization in the transition process.

Key words: thermocapillary-buoyancy convection, instability, open rectangular liquid layer, spatiotemporal evolution

中图分类号:  (Capillary and thermocapillary flows)

  • 47.55.nb
47.20.-k (Flow instabilities) 47.27.Cn (Transition to turbulence) 44.10.+i (Heat conduction)