I Pressurization rate vs. Mass Flow rate

AI Thread Summary
The discussion revolves around the confusion between mass flow rate and pressure flow rate in a valve application. The user is trying to convert mass flow rate, measured in lbm/s, to a pressure flow rate requested by the customer in psi/s, particularly in an adiabatic system. Various methods to relate pressure and density, including the ideal gas law and choked flow concepts, are mentioned but not fully understood. The user clarifies that the client is not misquoted; rather, their design lacks the capability to measure mass flow rate, leading to the request for a pressurization rate. A diagram of the system is suggested to clarify the setup and improve understanding.
Kerky
Messages
2
Reaction score
0
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.
 
Physics news on Phys.org
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?
 

Similar threads

Replies
10
Views
3K
Replies
2
Views
2K
Replies
21
Views
3K
Replies
4
Views
2K
Replies
10
Views
2K
Replies
30
Views
2K
Replies
1
Views
3K
Back
Top