Pressure and flow rate relationship

AI Thread Summary
The discussion centers on the relationship between pressure and flow rate in a pipe, specifically questioning whether a flow rate drop from 8000 gpm to 4000 gpm would result in a pressure of 27.5 psig from an initial 55 psig. It is noted that if the flow is turbulent, the pressure drop will be more significant than half, potentially around three-quarters. Additionally, a user seeks guidance on calculating the flow rate of air through a 12 mm diameter pipe at a pressure of 7 kg/cm². The thread is over two years old and has been closed, with a suggestion to start a new thread in the homework forums and conduct prior research. The conversation highlights the complexities of fluid dynamics and the need for proper methodology in problem-solving.
mfholbac
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If I 8000 gpm flowing in a pipe, and know that pressure of the water is 55psig, will the pressure be 27.5psig if the flow rate through the same pipe drops to 4000gpm.
 
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Hi mfholbac. Welcome to Physics Forums.

I assume you mean that the inlet pressure is 55 psig, and the outlet is into the atmosphere at 0 psig. If the flow is turbulent, which I assume will be the case in your system, then the pressure will drop more that just half-way, but a little less than 3/4 of the way.

Chet
 
Sir, Kindly let me know how to calculate flow rate (cfm or Litre/m) of air flowing through a pipe of 12 mm dia from a reservoir at pressure 7 kg/cm2 to atmosphere.

i.e ;- how much volume of compressed air could pass within a minute through a "X" mm dia pipe from a constant pressure (7 kg/cm2)
 
MANPREET SINGH said:
Sir, Kindly let me know how to calculate flow rate (cfm or Litre/m) of air flowing through a pipe of 12 mm dia from a reservoir at pressure 7 kg/cm2 to atmosphere.

i.e ;- how much volume of compressed air could pass within a minute through a "X" mm dia pipe from a constant pressure (7 kg/cm2)
This thread is over 2 years old, with no new responses. Please start a new thread. I am closing this one.

Please put your new thread in one of the homework forums, and use the template. Also, please do some literature search on your own before posting, to get an idea how to address a problem like this. The homework template will ask you to show your thinking and effort so far.

Chet
 

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