Calculating Flow Rate for Air and Methane in a Valve

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Discussion Overview

The discussion revolves around calculating the flow rate of air and methane through a valve under specific pressure conditions. Participants explore how to simulate the flow of methane using air, considering the necessary pressure adjustments to maintain equivalent mass flow rates.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about the specific gas intended for substitution, suggesting methane or hydrogen as possibilities.
  • Another participant confirms that the gas in question is methane and seeks to understand the pressure required for air to simulate methane flow through a valve.
  • There is a request for clarification on the pressure needed for a specific mass flow rate through a given aperture when comparing air to methane.
  • A participant provides a link to a resource that calculates flow rates for various fluids, including air and methane, suggesting it may help answer the original query.
  • One participant expresses the need to recalculate methane flow into air while maintaining the same flow rate, referencing a specific formula for guidance.

Areas of Agreement / Disagreement

Participants generally agree on the need to determine the pressure required for air to match the flow characteristics of methane. However, the discussion includes multiple inquiries and clarifications, indicating that the topic remains unresolved with no consensus on specific calculations or methods.

Contextual Notes

The discussion lacks detailed assumptions regarding the specific conditions of the gas flow, such as temperature and valve dimensions, which may affect the calculations. Additionally, the referenced formula and resource have not been fully explored or validated within the thread.

Who May Find This Useful

Individuals interested in fluid dynamics, gas flow calculations, or those working with gas substitution in engineering applications may find this discussion relevant.

eway_123
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TL;DR
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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Likes   Reactions: sophiecentaur
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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