Force of Flowing Water


by smprindi
Tags: flow, force, velocity, water
smprindi
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Jan15-09, 04:29 PM
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If a pipe flowing with water enters a structure where the structure wall will stop the horizontal velocity of the flow and direct it downward (i.e a pipe in to a manhole with an outlet at a considerably lower elevation), how do you calculate the force exerted on the structure of that wall. I have found the equation Force = density of water * flow volume * change in velocity. Is this on the right track?
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tiny-tim
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Jan15-09, 05:15 PM
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Hi smprindi ! Welcome to PF!
Quote Quote by smprindi View Post
… how do you calculate the force exerted on the structure of that wall. I have found the equation Force = density of water * flow volume * change in velocity. Is this on the right track?
Yes …

from good ol' Newton's second law …

force = rate of change of momentum

= velocity times mass per time …

which is the same as your Force = density of water * flow volume * change in velocity.


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