B Calculating Flow Rate for Air and Methane in a Valve

AI Thread Summary
The discussion focuses on calculating the necessary air pressure to simulate the flow rate of methane through a valve. The original poster seeks to replace methane with air due to physical limitations in driving gas. Participants clarify that the goal is to determine the pressure required for air to match the mass flow rate of methane through a specific aperture. A link to a flow rate calculator for various gases, including air and methane, is provided to assist in the calculations. The conversation emphasizes the need for accurate pressure adjustments to achieve the desired flow rate.
eway_123
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gas, air, thermodynamics, physics
good day! I did not find a suitable forum thread, so I am writing here ... There is a valve through which you need to drive gas under a certain pressure, physically there is no way to drive gas, so it was decided to replace the gas with air. Knowing the required pressure and gas temperature, how to create the same air mixture? thank
 
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Hi. What "gas" did you have in mind? Are you talking about Methane (Natural Gas) or perhaps Hydrogen?
Are you suggesting that you need an "air substitute"?
 
eway_123 said:
physically there is no way to drive gas

https://outdoorgearlab-mvnab3pwrvp3t0.stackpathdns.com/photos/20/0/321541_12305_L.jpg

1594906742552.png
 
sophiecentaur said:
Hi. What "gas" did you have in mind? Are you talking about Methane (Natural Gas) or perhaps Hydrogen?
Are you suggesting that you need an "air substitute"?
yes, Natural Gas-Methane.
 
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So you want to know the pressure needed for a particular mass flow rate through a particular sized aperture, compared with what you get with air?
 
sophiecentaur said:
So you want to know the pressure needed for a particular mass flow rate through a particular sized aperture, compared with what you get with air?
yes, I want to know what air pressure is needed to simulate gas passing through this hole
 
The pressure for the same mass flow rate for air as for methane?
This link allows you to calculate flow rate for air and methane (many other fluids too) for a range of pipe dimensions. It could give you the answer you seek.
 
sophiecentaur said:
The pressure for the same mass flow rate for air as for methane?
This link allows you to calculate flow rate for air and methane (many other fluids too) for a range of pipe dimensions. It could give you the answer you seek.

Thanks for the answer. Yes, I need to recalculate gas (methane) into air while keeping the flow rate. I looked at the formula:
https://www.mankenberg.ru/ru/55/UPLOAD/pdf/s33_3.pdf
 

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