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  • Summary & Details

Large-scale Flow Structures of Drag-reducing Turbulent Boundary Layer due to Surfactant Injection


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Category(E)Hot Topics
Author(J)1) 玉野 真司
Author(E)1) Shinji Tamano
Affiliation(J)1) 名古屋工業大学


Abstract(E)A small amount of some kinds of surfactant additives could cause significant frictional drag reduction in wall-bounded turbulent flows. In this tutorial paper, we present recent large-region PIV measurements with four CCD cameras for turbulent boundary layer due to the injection of nonionic surfactant. Very large-scale coherent structures appear periodically in the case of large drag reduction ratio beyond 60%. Such structures expand to beyond twice of the boundary layer thickness in the streamwise direction, which are far from typical near-wall coherent structures of Newtonian fluids.

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