Resultant force on pipe (Fluid Mechanics)

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Discussion Overview

The discussion revolves around the application of Bernoulli's Equation and momentum balance in fluid mechanics, specifically regarding the resultant force on a pipe. Participants are addressing a homework problem that involves calculations related to fluid flow and forces acting on the fluid.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • The original poster presents a homework statement and equations related to Bernoulli's principle, indicating uncertainty about the correctness of their approach.
  • One participant, Chet, comments on the poor quality of the exhibits but suggests that the original poster's approach seems to be on target, although a clearer momentum balance is needed.
  • The original poster expresses concern about whether the momentum in the y direction should be considered negative.
  • Chet questions whether the original poster included the pressure forces acting on the fluid entering and leaving the system, emphasizing the need for a momentum balance on the fluid.

Areas of Agreement / Disagreement

Participants do not reach a consensus, as there are uncertainties regarding the calculations and the interpretation of momentum direction. The discussion remains unresolved with multiple viewpoints on the approach to the problem.

Contextual Notes

There are limitations in the clarity of the exhibits provided, which may affect the understanding of the momentum balance. The discussion also highlights the need for careful consideration of pressure forces in the analysis.

Ronaldo95163
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Homework Statement


Posted in picture below

Homework Equations


Bernoulli's Equation
P/pg + v1^2/2g + z1 = P/pg + v2^2/pg + z2

The Attempt at a Solution


Posted in picture below

Wasn't sure if what I did was correct...still practising the topic itself
 

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The quality of your exhibits is very poor, but, as best I could tell, your approach is on target. But I wish I could see a cleaner rendition of your momentum balance.

Chet
 
Chestermiller said:
The quality of your exhibits is very poor, but, as best I could tell, your approach is on target. But I wish I could see a cleaner rendition of your momentum balance.

Chet
Sorry about that
I think it got messed up when it was uploading.

These are my cacluations for momentum

Im thinking that I was supposed to make the momentum in the y direction negative?
 

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Ronaldo95163 said:
Sorry about that
I think it got messed up when it was uploading.

These are my cacluations for momentum

Im thinking that I was supposed to make the momentum in the y direction negative?
I still can't read it. Did you remember to include the pressure forces on the fluid entering and leaving?
What you're trying to do is a momentum balance on the fluid passing through the y. The force of the fluid on the y is then minus the force of the y on the fluid.

Chet
 

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