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

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Mohamed_Wael
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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 !
 

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Zero equals zero.
 
what do u mean ?
 
The boundary layer velocity is zero.
 
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Bystander said:
The boundary layer velocity is zero.

I believe you mean the wall velocity is zero.
 
... barring "slip."
 

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