# Boundary layer thickness in pipe entrance

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 March 8, 2007, 03:44 Boundary layer thickness in pipe entrance #1 Bo Jensen Guest   Posts: n/a Hi all I am trying to find the equations for the boundary layer thickness from pipe entrance to fully delveoped turbulent pipe flow. I have found one, but it gives me a boundary layer thickness at large distance from the inlet (but still lower distance than that of the enrance length) that is aover half the diameter of the pipe. Could some please help

 April 2, 2007, 05:12 Boundary layer thickness in pipe flow #2 Adam Adamkowski Guest   Posts: n/a Hi, I am interested in the boundary layer thickness in fully delveoped turbulent pipe flow. Could you give me aproximete formula which allow me to estimate the boundary layer thickness in pipe flow in depending on the Reynolds number. The smooth pipe can be assumed. or totally .

 April 6, 2007, 22:53 Re: Boundary layer thickness in pipe flow #3 Trinity Guest   Posts: n/a Hi, its difficult to type out the formula here. But there is an extension of the Law of the Wall to internal flows such as pipe flow. Nikuradse equation gives the dependence of velocity on r over a large region of the flow except the sublayer. Check out Chapter 13 of 'Convective Heat and Mass Transfer' by Kays and Crawford.