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Engineering
Mechanical Engineering
Theoretical Pipe Flow: Understanding Poiseuille's Law
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[QUOTE="ATKrank, post: 5483097, member: 595099"] I think I get what you are saying. It helps for me to think of fluids as molecules in instances like this so I am going to re-cap it like that. I believe what you are saying is that if we look at a molecule of water in turbulent flow, we know that not all the velocity of the molecule is in the axial direction of the pipe. I am picturing the molecule carrying momentum into the wall and that is what is causing there to be a larger shear stress than it would with laminar flow. So basically another way to say it is that in laminar flow, the shear stress in the pipe wall is purely caused by static pressure of the fluid since all the momentum is in the axial direction. While with turbulent flow the shear stress is caused by a summation of the static pressure, and a portion of dynamic pressure of the fluid since a portion of the momentum is not in the axial direction. Is this a correct analysis? [/QUOTE]
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Theoretical Pipe Flow: Understanding Poiseuille's Law
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