| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Wavenumber Selection by Bénard–Marangoni Convection at High Supercritical Number |
| Di Wu1, Li Duan1,2**, Qi Kang1,2** |
1Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190
2School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Di Wu, Li Duan, Qi Kang 2017 Chin. Phys. Lett. 34 054702 |
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Abstract Marangoni–Bénard convection, which is mainly driven by the thermocapillary (Marangoni) effect, occurs in a thin liquid layer heated uniformly from the bottom. The wavenumber of supercritical convection is studied experimentally in a $160\times160$-mm$^{2}$ cavity that is heated from the bottom block. The convection pattern is visualized by an infrared thermography camera. It is shown that the onset of the Bénard cell is consistent with theoretical analysis. The wavenumber decreases obviously with increasing temperature, except for a slight increase near the onset. The wavenumber gradually approaches the minimum when the supercritical number $\varepsilon$ is larger than 10. Finally, a formula is devised to describe the wavenumber selection in supercritical convection.
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Received: 13 November 2016
Published: 29 April 2017
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| PACS: |
47.20.Dr
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(Surface-tension-driven instability)
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47.54.-r
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(Pattern selection; pattern formation)
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47.54.De
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(Experimental aspects)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11502271 and 11372328, the Strategic Priority Research Program on Space Science of the Chinese Academy of Sciences under Grant Nos XDA04020405 and XDA04020202-05, and the China Manned Space Engineering Program. |
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