File talk:Boundarylayer.png

Die Geschwindigkeitsprofile sind falsch: im laminaren Abschnitt muss du/dy größer sein --> geringere Wandreibung als im turbulenten Fall. vgl.: http://www4.fh-swf.de/media/bilder/iserlohn/labore__forschung___lehre_1/maschinenbau/slgeschwprof.jpg

Probably repeating what the user above said, but this figure is incorrect. Turbulent momentum boundary layers are thinner than laminar momentum boundary layers. (See Pope's book Turbulent Flows, Chapter 7; also, [Boundary-layer_thickness]). Turbulent flows create plug flow conditions and enhances mixing (of momentum, not just mass and energy). Charlesreid1 (talk) 21:29, 22 August 2013 (UTC)

Mechanical engineer, HND qualified. when observing the diagram 'free stream' showing laminar and turbulent flow the 'green arrows give a misguided view of the distinction between laminar and turbulent flow. All the arrows heading in the same direction and on an axis parallel to that of the wall is INCORRECT, this gives the impression that in turbulent flow the layers of flow do not mix, which is wrong, they are turbulent. However a rough skim of the main body of the text seems to give an accurate explanation of the conditions of both flows, For reference in laminar flow, the inner fluid layer moves faster whilst the outer layer is static at the pipe wall (theoretically). If the flow velocity is increased the 'critical velocity' is reached and the fluid flow becomes turbulent (mixes) Dec 2014