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 !
Pressure drop doesn't depend on pipe material (laminar flow)
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Zero equals zero.
Mohamed_Wael
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what do u mean ?
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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.
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... barring "slip."
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