To me, the No-slip condition is counterintuitive. I understand that internal friction, or viscosity, will slow the fluid towards the boundary, but does it really reduce to zero? I have seen videos of very viscous fluids being moved slowly showing this behaviour, but intuition tells me that lower viscosity fluids moving at higher speeds (below turbulence) will surely have a velocity at the boundary. I know Prandtl's 1904 lecture introduced this condition, and that it has become embedded in fluid dynamics, but it bothers me.
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To me, the No-slip condition is counterintuitive. I understand that internal friction, or viscosity, will slow the fluid towards the boundary, but does it really reduce to zero? I have seen videos of very viscous fluids being moved slowly showing this behaviour, but intuition tells me that lower viscosity fluids moving at higher speeds (below turbulence) will surely have a velocity at the boundary. I know Prandtl's 1904 lecture introduced this condition, and that it has become embedded in fluid dynamics, but it bothers me.