Force of Water Flow: Calculating Pressure on Structure

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To calculate the force exerted on a structure by water flow, the equation Force = density of water * flow volume * change in velocity is appropriate. This aligns with Newton's second law, which states that force equals the rate of change of momentum. The discussion confirms that the approach is valid for determining the impact on the structure's wall when water flow is redirected. Understanding the relationship between velocity, mass flow rate, and force is crucial in this context. Accurate calculations are essential for engineering applications involving water dynamics.
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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 into 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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Welcome to PF!

Hi smprindi ! Welcome to PF! :wink:
smprindi said:
… 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. :smile:
 

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