File:Dragsphere nasa.jpg

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Summary

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Description
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.
Date
Source http://www.grc.nasa.gov/WWW/k-12/airplane/dragsphere.html, Cropped from the original version, removing the NASA logo.
Author NASA
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Licensing

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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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current20:58, 10 December 2012Thumbnail for version as of 20:58, 10 December 2012717 × 434 (73 KB)Crowsnest (talk | contribs){{Information |Description ={{en|1=Drag coefficient for a sphere as a function of Reynolds number. The solid line is for a sphere with a smooth surface, while the dashed line is for the case of a roug...

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