| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Marangoni Bifurcation Flow in a Microchannel T-Junction and Its Micropumping Effect: A Computational Study |
| PAN Zhen-Hai1, WANG Hao1**, YANG Zhen2 |
1Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering University, Peking University, Beijing 100871
2Thermal Engineering Department, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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PAN Zhen-Hai, WANG Hao, YANG Zhen 2012 Chin. Phys. Lett. 29 074702 |
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Abstract We discuss a bifurcation phenomenon of Marangoni flow in a microchannel T-junction and its novel unidirectional pumping effect. The T-junction is formed by a main channel connected with a liquid reservoir and a side channel outlet to the atmosphere. A volatizing meniscus is formed in the side channel and Marangoni convections are generated due to the non-uniform evaporation on the meniscus. It is found for weak evaporations (Ma < 270) the Marangoni convections are symmetrical. However, for intense evaporations (Ma >270), the initial inward symmetrical Marangoni convection becomes unstable and converted into one single vortex flow. Moreover, the single vortex induces a steady unidirectional flow in the main channel, acting like a pump.
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Received: 26 December 2011
Published: 29 July 2012
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| PACS: |
47.20.Dr
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(Surface-tension-driven instability)
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47.20.Ky
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(Nonlinearity, bifurcation, and symmetry breaking)
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44.35.+c
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(Heat flow in multiphase systems)
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