回転同軸二重円筒間クエット乱流の制御 : 水溶性ポリマーの一様添加(乱流現象の制御(1),一般講演)

概要

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This study aims to clarify the behavior of turbulent frictional drag reduction by dilute polymer additives in practical usage such as flows around ship body or that in pipeline. The drag reduction rate at the practical velocity range was estimated by the turbulent Couette flow between the rotating concentric cylinder geometry. The friction appearing at the inner cylinder surface was measured while the outer cylinder was rotating at high speed. Water soluble polymer (POLYOX molecular weight: 600,000) was used as the additive. The effects of concentration and Reynolds number, wall roughness and lifetime of the polymer were investigated. The polymer drag reduction also appears at the flows over rough wall surface. The lifetime of the polymer can be characterized as the destruction rate process of effective concentration of the polymer by the work done by hydrodynamic deformation.
日本流体力学会の論文
2007-08-06