Tuesday, December 30, 2014

Free and Forced Vortex flow with Examples

Vortex flow is defined as the flow of a fluid along a curved path or the flow of a rotating mass of fluid is known as Vortex flow. The following are the two types of Vortex flow:
  1. Free Vortex Flow and
  2. Forced Vortex Flow 

Free Vortex Flow

When no external torque is required to rotate the fluid mass that type of flow is called free vortex flow.
  • Flow of liquid through a hole provided at the bottom of the container
  • Flow through kitchen sink
  • Draining the bath tub
  • Flow of liquid around a circular bend in pipe
  • A whirlpool in a river
  • The flow fields due to a tornado.

Forced Vortex Flow

Forced vortex flow is defined as that type of vortex flow in which some external torque is required to rotate the fluid mass.
  • Flow of water through the runner of a turbine
  • Flow of liquid through the passage of impeller of centrifugal pumps
  • Rotation of water in a washing machine


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  4. why free vortex flow is irrotational?

  5. 2018 ISRO exam, in centrifugal pumps water leaving the impeller is given as free vortex flow.