2015 Fiscal Year Final Research Report
Enhancement of mixing by the chaos of multiphase flows in a curved duct and the elucidation of vortical structures
| Project/Area Number |
24560196
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Okayama University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Keywords | 曲がり管 / 混相流 / ラグランジアンカオス / 渦構造 / 物質混合 / LIF / OpenFOAM / マイクロタス |
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| Outline of Final Research Achievements |
Recently enhancement of mixing and associated chemical reaction in pipe flows is very important theme in engineering. However, for generally used narrow pipes in which the fluid flow is slow, it is not expected to have turbulent mixing. In spite of that it has been known that chaotic behaviors of flows in a curved rectangular duct with moving walls enhance mixing and increase the thermal conductivity even if the Reynolds number is very small. In the present study, the cause of the mixing is found to be due to the Lagrangian chaos. Experimental and numerical studies showed that the relationship between the change of vortical structures varying the aspect ratio of the duct cross section and the change of mixing efficiency. Based on the present study, it is found that the cross section having a longer vertical side is more effective in mixing than that with a longer horizontal side.
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| Free Research Field |
工学
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