File:Drag sphere nasa.svg

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English: Drag coefficient Cd for a sphere as a function of Reynolds number Re, as obtained from laboratory experiments. The solid line is for a sphere with a smooth surface, while the dashed line is for the case of a rough surface. The numbers along the line indicate several flow regimes and associated changes in the drag coefficient:
  • 2: attached flow (Stokes flow) and steady separated flow,
  • 3: separated unsteady flow, having a laminar boundary layer upstream of the separation, and producing a vortex street,
  • 4: separated unsteady flow with a laminar boundary layer at upstream side, before flow separation, with downstream of the sphere a chaotic turbulent wake,
  • 5: post-critical separated flow, with a turbulent boundary layer.
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Source http://www.grc.nasa.gov/WWW/k-12/airplane/dragsphere.html
Author NASA
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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Date/TimeThumbnailDimensionsUserComment
current21:13, 14 May 2013Thumbnail for version as of 21:13, 14 May 2013673 × 451 (18 KB)Kraaiennest (talk | contribs)== {{int:filedesc}} == {{Information |Description={{en|1=Drag coefficient ''C''<sub>d</sub> for a sphere as a function of Reynolds number ''Re'', as obtained from laboratory [[:en:experiment|experiments]...

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