Velocity of water across depth

In summary: Can...In summary, the water at the top surface moves faster than the water at the bottom because the friction at the top surface is zero, while the friction at the bottom surface is due to the non-slip boundary condition.
  • #36
Chestermiller said:
There are pressure forces on the two ends that have to be balanced by the viscous frictional (tangential) force.
Can you explain further how to get 2\pi r L\tau_{rz}(r) ??
 
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  • #37
Chestermiller said:
There are pressure forces on the two ends that have to be balanced by the viscous frictional (tangential) force.
why there is L ?
 
  • #38
Poiseulle.PNG
 
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