Velocity in a pipe

  1. I need to find the velocity within a pipe , I know the flow rate and diameter

    Flow rate =0.01
    Diameter =90mm

    Am I correct in thinking to use V =Q/A

    Where A is found using A=pi/4 x D^2

    Using this I got A =0.0064m but somehow this does not seem quite right to me

    Can anybody please tell me where I am going wrong please

    Thanks
     
  2. jcsd
  3. SteamKing

    SteamKing 8,795
    Staff Emeritus
    Science Advisor
    Homework Helper

    Please include units for all quantities. How else can we tell what these numbers mean?
     
  4. 0.01m3 s-1
     
  5. Yes, it's not quite right. Your answer is a length...you want an area.
     
  6. Ah so it should be m^2 ?
     
  7. What are the units for your flow rate?

    And also, Your equation for area includes the term D^2 which implies the diameter is being squared, so your answer for area should have the units mm^2.
     
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