希薄高分子溶液中を自由落下する球の加速特性　抵抗減少の初生点

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  • Motions of a Free-Falling Sphere in the Acceleration Range in Dilute Polymer Solutions Onset Points of Drag Reduction.
  • キハク コウブンシ ヨウエキチュウ オ ジユウ ラッカスル キュウ ノ カソク

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Experiments on the falling velocity of a sphere in the acceleration range were performed with dilute polymer solutions and exhibited drag reduction. Six spheres were tested. Spheres between 7.93mm and 14.95mm in diameter were dropped into an acrylic resin vessel, 1010mm high by 300mm in diameter, filled with dilute polymer solution. The equation for the motions of a sphere in Newtonian fluids were analyzed numerically, and the results were compared with the experimental data. The results obtained in this study showed that the onset points of drag reduction on the drag of a sphere can be estimated using a parameter associated with the falling velocity and the sphere diameter.

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