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Experimental Investigation of Influence of Interfacial Tension on Convection of Two-Layer Immiscible Liquid |
| LI Lu-Jun;DUAN Li;HU Liang;KANG Qi |
| National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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LI Lu-Jun, DUAN Li, HU Liang et al 2008 Chin. Phys. Lett. 25 1734-1737 |
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Abstract Béenard--Marangoni convections of two-layer fluids heated from the bottom are investigated experimentally with a particle imagine velocimetry. The flows are visualized from the side, and various velocity fields near the onset of convection, such as three-layer vortex convective patterns, are observed when the depth ratio varies in a wide range. A new classification of the convective patterns is proposed with more detail than in previous studies. The analysis of the results indicates that the interface tension greatly influences the motion intensities of the bottom and top layers. The dimensionless wave number increases with the Bond number when the motion in the top layer is not more intense than that in the bottom layer, which agrees with the theoretical prediction.
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| Keywords:
47.20.Bp
47.20.Dr
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Received: 19 January 2008
Published: 29 April 2008
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| PACS: |
47.20.Bp
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(Buoyancy-driven instabilities (e.g., Rayleigh-Benard))
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47.20.Dr
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(Surface-tension-driven instability)
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