How to calculate the water pressure?

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Discussion Overview

The discussion revolves around calculating water pressure in a horizontal pipe system with multiple openings. Participants explore the implications of pipe diameters, water movement, and the application of fluid dynamics principles such as Bernoulli's equation.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Homework-related

Main Points Raised

  • One participant asks how to calculate the pressure at three openings in a horizontal pipe system where water is pumped at 8 bars.
  • Another participant questions whether the water is moving or stationary and what the openings connect to, suggesting that the pressure might be 8 bars throughout based on the initial information.
  • A participant clarifies that the water is moving and provides details about the pipe diameters and lengths, indicating that the pressure is exerted by the pump.
  • There is a discussion about the configuration of the pipes, with one participant confirming the diameters and lengths of the pipes connected to the main pipe.
  • One participant notes that the exit pipe diameter may not matter if pressure drop due to friction and viscosity is ignored, but height differences are important, which leads to a request for more information about the heights of the pipes.
  • A participant mentions having learned basic theorems related to pressure but expresses uncertainty about which equations to apply in this specific scenario involving one input and three outputs.
  • Another participant reiterates the importance of height in the pressure calculation and requests clarification about the vertical positioning of the pipes.

Areas of Agreement / Disagreement

Participants do not reach a consensus on how to calculate the pressure at the openings, and multiple viewpoints regarding the relevance of pipe diameter and height remain. The discussion is unresolved.

Contextual Notes

Participants note the importance of height in pressure calculations but do not specify the heights involved, which may limit the analysis. There is also an acknowledgment of potential pressure drops due to friction and viscosity, which are not fully addressed.

loy
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the pipes is horizontal,there are 3 opennings at the end.the water is pumped with 8 bars , how to calculate the pressure of these 3 openings?
 
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welcome to pf!

hi loy! welcome to pf! :smile:
loy said:
the pipes is horizontal,there are 3 opennings at the end.the water is pumped with 8 bars , how to calculate the pressure of these 3 openings?

is the water moving or stationary?

what do these openings connect to? :confused:

on the information given so far, isn't the pressure 8 bars throughout?
 


hi,tim~

tiny-tim said:
hi loy! welcome to pf! :smile:


is the water moving or stationary?

what do these openings connect to? :confused:

on the information given so far, isn't the pressure 8 bars throughout?


the water is moving,but i only know the pressure of water pump is 8 bars and the diameter of the pipe which is connected to the pump is 2 and 1/2 inches.
there are 3 pipes connected to the previous pipe,3 of them are 1m long,1 is above the ground(d=1/2 inches) and another 1 is underground(d=1/2inches).the last one(2 and 1/2 inches) is at the same level with the main pipe.
Actually the pressure is exerted by the pump to the water.
 
hi loy! :wink:

so it's a 2.5 in diameter pipe, connected to two 0.5 in pipes and another 2.5 in pipe?

ok, what do you think the answer is? :smile:
 
tiny-tim said:
hi loy! :wink:

so it's a 2.5 in diameter pipe, connected to two 0.5 in pipes and another 2.5 in pipe?

ok, what do you think the answer is? :smile:

yup,you've got it~
erm...sigh...i am sorry ,the main problem is i don't know the answer...
so , i need your help~
 
loy said:
yup,you've got it~
erm...sigh...i am sorry ,the main problem is i don't know the answer...
so , i need your help~

i'm happy to help :smile:

but we don't just give out the answers here

you must know something about this type of problem …

what equations have you learned?
 
Exit pipe diameter doesn't matter (assuming you're ignoring pressure drop due to friction and viscosity). Height does matter, but you don't specify the height of the pipe above or the depth of the pipe below.
 
tiny-tim said:
i'm happy to help :smile:

but we don't just give out the answers here

you must know something about this type of problem …

what equations have you learned?

okay,i have learned some basic theorem(like bernoulli's equation,stokes' law) about the pressure,but i don't know which 1 should be used since i have never met the question which needs to calculate the pressure of fluid with 1 input and 3 outputs.all i know is the dV/dt of input and output are the same.

rcgldr said:
Exit pipe diameter doesn't matter (assuming you're ignoring pressure drop due to friction and viscosity). Height does matter, but you don't specify the height of the pipe above or the depth of the pipe below.

I did.the 3pipes connected to the main pipe are 1-m long ,meaning 1 is 1m(vertical,d=0.5inches) above the level of the main pipe,another 1 is 1m(vertical,d=0.5inches) below the level,the main pipe and the last(1m) are horizontal and d=2.5inches.just like a cross.
 

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