2013 Fiscal Year Final Research Report
Drag Reduction of Bio-Fiber Suspenshins
| Project/Area Number |
23560201
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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 | Tokyo Metropolitan University |
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Principal Investigator |
WATANABE Keizo 首都大学東京, 理工学研究科, 名誉教授 (20072134)
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| Co-Investigator(Kenkyū-buntansha) |
SATOSHI Ogata 首都大学東京, 理工学研究科, 准教授 (50315751)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 流体工学 / 内部流 / 円管内流れ / 圧力損失 / バイオ繊維懸濁液 / 抵抗減少効果 |
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| Research Abstract |
Drag reduction phenomena of bio-fiber suspensions of silk threads, cotton yarn and hemp fibers in a circular pipe were investigated within the aspect ratio l/d=2-52 and the concentration Cw=250-2,500ppm, experimentally.For comparison, measurements were also performed on the Newtonian solvent. Pressure drop measurements indicated that the wall shear stress of the pipe decreased by a maximumm of approximately 20% compared to that of water. Drag reduction ratio were correlated with the non-dimensional parameter involving Young's modurus by non-dimensional analysis. It was shown that the equation agrees with the experimental data within 30%.
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