File:Drag coefficient on a sphere vs. Reynolds number - main trends.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 dark line is for a sphere with a smooth surface, while the lighter-colored 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: super-critical separated flow, with a turbulent boundary layer.
Date before 2010
date QS:P,+2010-00-00T00:00:00Z/7,P1326,+2010-00-00T00:00:00Z/9
(original), 2016 (modifications)
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Date/TimeDimensionsUserComment
current10:52, 3 October 2016655 × 341 (18 KB)AriadacapoReduce font size for axis labels

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