On the Motion of Spheres in Fluid at Low Reynolds Numbers : Part.1 Flow past a Solid Sphere

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概要

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• A solid -sphere drag is measured at low Reynolds numbers, of which the estimated uncertainty is ± 1.2 %. The measurements show that the Stokes formula for the sphere drag is applicable only at Re=0 and that the Oseen formula for the sphere drag represents the actual drag most accurately at the Reynolds numbers below 0.4. Here the Reynolds number is related to the sphere diameter. New method to visualize streamlines for the steady flow past a body is developed by exploiting a naturally occurring phenomenon in glycerol. An application of this method to visualization of streamlines around a solid sphere reveals that the first -order solution for the Oseen equation represents the flow field around a sphere most accurately at the Reynolds numbers below 0.4.

• 一般社団法人日本機械学会の論文

著者

• Kumagai Teruo

  Science University Of Tokyo

• FUJIWARA Jiro

  Science University of Tokyo. Present adress ; Sony Corporation, Communication Products Group

• Fujiwara Jiro

  Science University Of Tokyo. Present Adress ; Sony Corporation Communication Products Group

関連論文

• Numerical Analysis of Low-Reynolds Number Flow around a Sphere
• Analytical Solution of Oseen's Equation for Creeping Flow around a Spherical Gas-bubble in Liquid
• On the Motion of Spheres in Fluid at Low Reynolds Numbers : Part.1 Flow past a Solid Sphere

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