Abstract
An experimental study has been performed in order to investigate the relationship between the extensional viscosity of polymer solution and the turbulent drag reduction. A flexible polymer and a rigid rod-like polymer were added to the two-dimensional turbulent flow that was visualized by the interference pattern of a flowing soap film and analyzed by a single-image analysis. The power spectra of interference images were obtained, which is related to the water layer fluctuations in turbulence. The power spectra show a scaling behavior and the power components give the information of drag reduction. It was suggested that the energy transfer mechanisms are different in streamwise and normal directions. In the normal direction, the energy transfer was prohibited by the orientation of polymers, while the energy transfer in the streamwise direction was prohibited by extensional viscosity of polymers. The extensional viscosities of polymer solutions were measured by calculating pressure losses at an abrupt contraction flow.
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Acknowledgements
This study is supported in part by the Grant-in-Aid for Young Scientists(B) (Project No.: 24760129) and the Grant-in-Aid for Scientific Research(B) (Project No.: 24360319) from the Japan Society for the Promotion of Science (JSPS).
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Hidema, R., Yamada, N., Suzuki, H., Furukawa, H. (2014). Turbulent Flow Characteristics Controlled by Polymers. In: Belyaev, A., Irschik, H., Krommer, M. (eds) Mechanics and Model-Based Control of Advanced Engineering Systems. Springer, Vienna. https://doi.org/10.1007/978-3-7091-1571-8_18
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DOI: https://doi.org/10.1007/978-3-7091-1571-8_18
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