Experimental Study on Formation of Stable Flow Layer from Composite Flow Networks Using Flip-Flop Flow
| Project/Area Number |
16560164
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | FUKUYAMA University |
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Principal Investigator |
UMEDA Shinzaburo FUKUYAMA University, Department of Civil and Environmental Engineering, Professor, 工学部, 教授 (90031145)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2005: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2004: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Diamond-shaped cylinder bundle / Flip-flop flow / Flow visualization / PIV / Composite flow networks / Stable flow laver / Multiple phase phenomenon / Environmental control device / アンビバレント流れ / PIV計測 / エッジトーン現象 |
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| Research Abstract |
The film-forming technology utilizing thin-film jet flow is applicable in maintaining freshness in food products and protecting operational environments of electronics systems. Such a thin-film jet may be produced in a conventional flow network consisting of multiple intersecting flow passages formed by a diamond-shaped flow islands (to be called cylinders). Recently, a new type of intersecting flow network, to be referred to as composite flow network, was developed consisting of a conventional flow network superposed with a co-current thin film flow. Subsequently, a different type of composite flow network was constructed consisting of a thin-film flow sandwiched in between two conventional flow networks in an attempt to stabilizing and thus extending the thin-film flow.
The aim of the present study is to clarify fluid flow characteristics of three different types : first on a conventional flow network, second on a three-layered composite flow network(F-A duct), and third on a three-layered composite flow network with slit flow(F-A duct with a slit). Each experiment consists of applications of flow visualization method and two-dimensional particle image velocimetry (PIV).
It is disclosed from the study that :
(1)Mutual interference between the symmetrical flip-flop flow oscillation in F-A duct and the longitudinal vortices generated in the F-A duct with a slit located downstream results in a symmetrical efflux.
(2)The existing jet streams bundle up firmly and form a flow in layers. The presence of intersecting flow in F-A duct with a slit causes the formation of stable flow layer downstream and strengthening (elongating) the efflux.
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Report
(3 results)
Research Products
(42 results)
