Fully developed flow in boundary layer flow
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The book states that \"the formed laminar boundary layers converge directly at the center of the tube.\" I have doubts about this: since the boundary layers are very thin, much smaller than the diameter of the tube, why do they converge at the center?
At low flow rates, a laminar state exists, and the boundary layer is not thin. Turbulence occurs at high flow rates, and only then is the boundary layer thin.