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Velocity of falling object through fluid flowing upward

  1. Dec 29, 2011 #1
    How to calculate the velocity of a object falling due to gravity through a pipe (vertical) where the fluid is flowing in upward direction?

    Please ignore the frictional force & just consider
    F net = F (gravity) - F (drag) - F (force the fluid exerting on the object during upward flow) - F(buoyancy)

    Note: Buoyancy force also can be ignored for simplicity. The drag is quadratic drag, not stokes'. Consider the terminal velocity. Please devise the general way to calculate this.
  2. jcsd
  3. Dec 29, 2011 #2


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    Can you find the velocity of an object through fluid that is not moving? If so just add (vectorally) the velocity of the fluid.
  4. Dec 29, 2011 #3


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    These are the same force. This is just a frame of reference problem.
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