Fluid kinematics problem

  • Thread starter UFeng
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I believe the solution to this is probably easy, but for some reason I just can't understand it. Any help would be GREATLY appreciated!

Homework Statement


Consider a point at x2 = h/2. Find the rate of closure of the angle between two material lines in the x1 and x2 directions. Find the rate of closure of the angles between an x1 line and lines at 45 degrees from it.


Homework Equations


v1 = v0[1 - (x2/h)^2] , v2 = v3 = 0, where v0 is the max velocity and h is the half height. Flow is through a slot. Let the Primary point, P, be at x2=h/2. Let the secondary point be P'



The Attempt at a Solution

 

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