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Homework Help: Concentric Circle Streamlines

  1. Jan 31, 2017 #1
    1. The problem statement, all variables and given/known data
    The streamlines of a certain flow are concentric circles about the origin, and the absoute value of the velocity varies according to the law
    Show that the angular speed of any fluid element in flow is described by:

    2. Relevant equations
    εz=(1/2)*(rate of rotation)

    3. The attempt at a solution
    ∂/∂r |V| =k*n*r^(n-1)
    εz=(1/2)*(∂/∂r |V|)

    Not sure where to go from here
    Last edited by a moderator: Jan 31, 2017
  2. jcsd
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