| Original Articles |
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Influence of Aspect Ratio on the Onset of Thermocapillary Oscillatory Convection in a Floating Half Zone of Large Prandtl Number Fluid |
| TANG Ze-Mei;HU Wen-Rui |
| National Microgravity Laboratory and Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080
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| Cite this article: |
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TANG Ze-Mei, HU Wen-Rui 2003 Chin. Phys. Lett. 20 526-528 |
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Abstract The onset of oscillatory thermocapillary convection in a floating half zone of 10 cst silicon oil (Prandtl number 105.6) is studied by the three-dimensional and unsteady numerical simulation in microgravity environment (g = 10-4 gearth). The results show that the steady and axi symmetric convection, for a fixed liquid bridge volume ratio Vl/V0 = 1, transits directly to the oscillatory convection if geometrical aspect ratio A is larger than the critical value Ac = 1.25, but transits to the oscillatory convection via the steady and non-axisymmetric flow if A is smaller than the critical value Ac. The result means that there are two bifurcation transitions in a liquid bridge of the large Prandtl number fluid with a smaller aspect ratio A.
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| Keywords:
47.20.Dr
47.27.Te
47.15.Fe
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Published: 01 April 2003
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| PACS: |
47.20.Dr
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(Surface-tension-driven instability)
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47.27.te
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(Turbulent convective heat transfer)
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47.15.Fe
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(Stability of laminar flows)
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