No slip condition
The layer of the fluid in contact with the solid boundary has the velocity of the boundary itself. In other words, the layer of the fluid sticks to the solid surface in contact and there is “NO SLIP” at the surface.
Lets take a example of pipe
Inside a pipe or tube a very thin layer of fluid right near the walls of the tube are motionless because they get caught up in the microscopic ridges of the tube. Layers closer to the centre move faster and the fluid sheers. The middle layer moves the fastest.
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