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Originally Posted by waxdass
laminar flow is slower than turbulent flow.
This is because with laminar flow - there is more friction on the edges to the pipe.
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Sigh...
Turbulent flow only happens because the boundary layer friction increases.
In piping up to Reynold's number of 2000 is usually laminar. As the velocity increases to greater than a Re of 4000 you have fully turbulent flow.
Everything in an engine should just be considered turbulent flow. Leaving a rough surface just increases the wall friction making the flow more turbulent.