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Nov10-09, 09:34 PM
P: 640
Quote Quote by Andy Resnick View Post
Pressure always acts normal to the vessel walls, the fluid velocity (shear stress) is tangent to the walls.
Hey thanks for the answer. I like it but can you give me a link or bit more description how fluid velocity acts tangent to the walls. Oh wait do you simply mean this

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So only hydrostatic pressure exerts pressure on the walls!! Is it that simple? but total pressure is both hydrostatic and velocity right. Since the pressure that exerts on the walls is what matters the airway collapses. If this is right Thanks a lot for you!! and I got it!!