Turbulent drag reduction in a mixed fiber-polymer system was observed both in a pipe flow and a flow on a rotating disk. Drag reducing rate in a mixed system was approximately the sum of each rate in separate system, though the effect of fiber additives is weakened a little by mixing with an increase in polymer concentration. In addition, we observed a phenomenon that transition to turbulence was delayed in a mixed system.
JSME International Journal Series C Mechanical Systems, Machine Elements and Manufacturing
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JSME international journal. Ser. C, Dynamics, control, robotics, design and manufacturing
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JSME international journal. Ser. A, Mechanics and material engineering
JSME international journal. Ser. 1, Solid mechanics, strength of materials