Force of Water Flow: Calculating Pressure on Structure

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SUMMARY

The discussion focuses on calculating the force exerted on a structure's wall by water flow entering a manhole. The correct formula for this calculation is established as Force = density of water * flow volume * change in velocity, which aligns with Newton's second law of motion. Participants confirm that this equation accurately represents the relationship between force, velocity, and mass flow rate in fluid dynamics.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Knowledge of Newton's second law of motion
  • Familiarity with water density and flow volume calculations
  • Basic concepts of momentum and its relation to force
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  • Research fluid dynamics equations related to pressure and force
  • Learn about the impact of pipe diameter on flow velocity
  • Explore applications of Newton's laws in engineering contexts
  • Investigate methods for measuring flow volume in pipes
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Engineers, fluid dynamics researchers, and anyone involved in structural design or water management systems will benefit from this discussion.

smprindi
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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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