Some concepts you cannot afford to miss about Rotational and Irrotational flow

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Basically there are two types of motion (i) Translation and (ii) Rotation. These two may exist independently or simultaneously.

SOME IMPORTANT POINTS ABOUT VORTEX MOTION.

  • Forced vortex is also known as flywheel vortex. = V/R =C (ESE OBJECTIVE)
  • Free vortex is also known as potential vortex. V.R=C
  • Compound vortex is combination of free and forced vortex also known as Rankine vortex. (ESE OBJECTIVE)
  • Spiral vortex (free vortex and a radial flow).
  • Rotation of a fluid, moving as a solid, about an axis is called forced vortex motion. Every particle of fluid will have same angular velocity.
  • Free vortex motion: Each particle moves in a circular path with speed varying inversely as the distance from the centre .V/R =C
  • Vortices can be classified based on vortex strength. A basic vortex also referred as bath tub vortex.
  • The mechanism of motion in the centrifugal compressor at inlet is forced vortex.
  • The mechanism at the inlet of KAPLAN TURBINE is free vortex. (based on question in ESE OBJECTIVE)

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