Fully developed flow
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Oct7-05, 11:29 AM
It doesn't turn into an inviscid flow further down the pipe, like Arlindo mentioned. The boundary layer increases in size as you make your way down the length of the pipe and since the boundary layer is where viscous forces are dominant, viscous forces take over.
Here's a graphic:
Hmm..where did I mention that the fluid turns inviscid?