Pressurization rate vs. Mass Flow rate

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SUMMARY

The discussion centers on the conversion of mass flow rate to pressure flow rate in an adiabatic system involving a valve. The user is attempting to reconcile the customer's request for pressure flow rate (psi/s) with their existing mass flow rate (lbm/s) requirements. Key concepts mentioned include the ideal gas law for isothermal systems, the ratio of pressures to densities, and choked mass flow rate calculations. The user seeks clarification on whether the client's request is valid given their current design limitations.

PREREQUISITES
  • Understanding of mass flow rate and pressure flow rate concepts
  • Familiarity with the ideal gas law and its applications
  • Knowledge of adiabatic processes in thermodynamics
  • Basic principles of fluid dynamics and valve operation
NEXT STEPS
  • Research the relationship between mass flow rate and pressure flow rate in adiabatic systems
  • Study the principles of choked flow and its implications for valve design
  • Explore the use of pressure-density ratios in fluid dynamics calculations
  • Investigate measurement techniques for mass flow rate in valve applications
USEFUL FOR

Engineers, fluid dynamics specialists, and anyone involved in valve design and flow measurement in adiabatic systems will benefit from this discussion.

Kerky
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Good afternoon all,

I am doing some back of napkin calcs for work and am having trouble finding an answer (or one that I can understand--its been a while since undergrad). We have a valve that has particular flow rate requirements to prevent unseating the valve seal. This is a mass flow rate and our customer has requested a pressure flow rate (so instead of lbm/s, they want psi/s). I can do it for a simple isothermal system using the ideal gas law, but our tanks are adiabatic.

I have found various explanations, like a ratio of pressures = ratio of densities to some function of gamma, and a dimensionless form of the pressure/time for choked mass flow rate.

If anybody can ELI5 or give me some guidance I would be very appreciative.
 
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Kerky said:
pressure flow rate
What is that?
Is the client being mis-quoted?
 
256bits said:
What is that?
Is the client being mis-quoted?
No, but their current design does not allow them to measure mass flow rate so they requested a pressurization rate.
 
Is the tank before or after the valve? Can you provide a diagram? It's very hard to read your mind?
 

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