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Pressure drop doesn't depend on pipe material (laminar flow)

  1. Aug 11, 2016 #1
    why does the pressure drop equation derived for the laminar flow has no parameter to indicate the surface roughness of the material of the pipe,unlike the turbulent flow !
     
  2. jcsd
  3. Aug 11, 2016 #2

    Bystander

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    Zero equals zero.
     
  4. Aug 11, 2016 #3
    what do u mean ?
     
  5. Aug 11, 2016 #4

    Bystander

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    The boundary layer velocity is zero.
     
  6. Aug 12, 2016 #5

    boneh3ad

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    I believe you mean the wall velocity is zero.
     
  7. Aug 12, 2016 #6

    Bystander

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    ... barring "slip."
     
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