Where are Viscous forces not present? - Fluid Mechanics

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• Pankaj   -Posted on 25 Sep 15
  Rotational and irrotational flow can be categorized according to the rotation of fluid particle about its own axis. When the fluid particles while flowing along stream lines in a flow, rotate about their own axis, then the flow is called as rotational flow. And when the fluid particles do not rotate about their own axis, then the flow is called as irrotational flow.
  
  In laminar flow the viscous forces are present because of the viscosity of the flowing fluid. Rotational flow is the flow of real fluid and every real fluid is having some viscosity, so the viscous forces are present in the rotational fluid flow. But There are no viscous forces in irrotational fluid flow.

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