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Wu Yongqiang, Duan Li, Li Yongqiang, Kang Qi. GROUND EXPERIMENTS OF BOUYANT THERMOCAPILLARY CONVECTION OF LARGE SCALE LIQUID BRIDGE WITH LARGE PRANDTL NUMBER[J]. Chinese Journal of Theoretical and Applied Mechanics, 2012, 44(6): 981-989. DOI: 10.6052/0459-1879-12-148
Citation: Wu Yongqiang, Duan Li, Li Yongqiang, Kang Qi. GROUND EXPERIMENTS OF BOUYANT THERMOCAPILLARY CONVECTION OF LARGE SCALE LIQUID BRIDGE WITH LARGE PRANDTL NUMBER[J]. Chinese Journal of Theoretical and Applied Mechanics, 2012, 44(6): 981-989. DOI: 10.6052/0459-1879-12-148
shu

GROUND EXPERIMENTS OF BOUYANT THERMOCAPILLARY CONVECTION OF LARGE SCALE LIQUID BRIDGE WITH LARGE PRANDTL NUMBER

  • 1.

    College of Science, Northeastern University, Shenyang 110004, China

  • 2. National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Funds: The project was supported by the National Natural Science Foundation of China (11032011, 10972224), the Chinese Academy of Sciences Directional Project (KJCX2-YW-L08) and the Manned Space Space Science Project.
  • Received Date: May 20, 2012
  • Revised Date: July 09, 2012
    Graphical Abstract
    • Abstract
  • Thermocapillary-driven convection in a large scale liquid bridge was investigated by ground experiments in this paper. We used 2 cst silicone oil (Pr=28.571), observed the onset of liquid bridge with different aspect ratios (A=l/d) and volumes, analyzed the transformation of temperature oscillation frequency and phase, discussed the problems of hydrothermal waves. The column diameter of liquid bridge was 20mm. Due to the limit by gravity, we constructed the bridge with 3-4.25mm height. With the help of five azimuthal thermocouples inserted in the bridge interior, we discovered that temperature oscillation in flow field occurs at the same time; bridges with different aspect ratios and volumes have different flow modes, and with the increase of temperature difference, the frequency increases approximately linearly, and oscillation phase of each temperature oscillation curve continuously changes. Bridges with different aspect ratios have different ways to chaos.
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    • References (9)
  • Preisser F, Schwabe D, Scharmann A. Steady and oscillatory thermocapillary convection in liquid columns with free cylindrical surface. Fluid Mechanics, 1983, 126: 545-567
    Velten R, Schwabe D, Scharmann A. The periodic instability of thermocapillary convection in cylindrical liquid bridges. Phys Fluids, 1991, 3: 267-279
    Frank S, Schwabe D. Temporal and spatial elements of thermocapillary convection in floating zones. Experiments in Fluids, 1997, 23: 234-251
    Zeng Z, Mizuseki H, Higashino K, et al. Direct numerical simulation of oscillatory Marangoni convection in cylindrical liquid bridges. Journal of Crystal Growth, 1999, 204: 395-404
    Hu WR, Tang ZM. Influence of liquid bridge volume on the floating zone convection. Cryst Res Technol, 2003, 38(7-8): 627-634
    Ryzhkov II. Thermocapillary instabilities in liquid bridges Revisited. Phys Fluids, 2011, 23: 1-6
    Xu JJ, Davis SH. Convective thermocapillary instabilities in liquid bridges. Phys Fluids, 1984, 27: 1102-1107
    Yano T, Nishino K, Kawamura H, et al. Space experiment on the instability of Marangoni convection in large liquid bridge-MEIS-4: effect of Prandtl number. Journal of Physics: Conference Series, 2011, 327: 1-7
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