1992 Fiscal Year Final Research Report Summary
Laminar-Turbulent Transition in a Free Liquid Film Flow and Its Application to Liquid Atomization
| Project/Area Number |
03650156
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | Osaka City University |
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Principal Investigator |
AZUMA Tsuneo Osaka City University, Dept. Mechanical Engineering, Professor, 工学部, 教授 (40047329)
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| Project Period (FY) |
1991 – 1992
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| Keywords | Transition / Boundary layer / Liquid film / Stability / Polymer solution / Rotating disk / Atomization / Radial flow |
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| Research Abstract |
1. The laminar-turbulent transition of a liquid film flow along a rotating disk is investigated both theoretically and experimentally. The flow has velocity profile of a kind of three-dimensional boundary layer. The instability of the flow changes, with an increase of the effect of the disk rotation on the flow, from a viscous- to an inflectional-type. The weak three-dimensionality of velocity profiles causes the decrease of the amplification factor of disturbance, suppressing the transition accordingly, whereas the strong three-dimensionality promotes the transition because of the inflectional instability.
2. The influence caused by addition of a small amount of polymers on the transition in a radial liquid film flow were investigated experimentally. It was found that the addition of very small amount of polymer promotes the transition.
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