Volumetric flow calculation

[Sa-Ro]

Hi..

Can we calculate volumetric flow for given data:

Case 1:

Orifice diameter, mm = 5

Inlet pressure, Bar = 6

Pressure drop, Bar = 1

Medium: Compressed air

Case 2:

Orifice diameter, mm = 5

Inlet pressure, Bar = 6

Pressure drop, Bar = 0

Medium: Compressed air

Thank you.

 

[hydtools]

Yes. Here in Colorado I use 12.2psi for local atmospheric pressure.

Ted

 

[Sa-Ro]

at 6 barg is appro 8.4 kg/m3

How did you get this number?

Density for air: 1.29 Kg/m3

amend it to be the volumetric flow at standard conditions

I am unable to get your point.

Can you elaborate with numbers?

1.013 bars. Bara=barg+1.013

Thank you

Colorado I use 12.2psi for local atmospheric pressure

How did you get this number? or any formula to calculate?

Thanks with Regards,
Sathish Rosario

 

[LittleInch]

Sathish,

Please read the response carefully and do some research. Air density changes with pressure. Look it up. I use engineering toolbox.

When dealing with compressible fluids you either need to work with mass or correct everything to a standard condition otherwise you get confused between actual flow and standard flow.

Your 1000 litres of "free air" is essentially at standard conditions. The calculations are at actual conditions at a given pressure. Hence why there is so much difference.

Until you understand this you won't get very far.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[hydtools]

https://www.engineeringtoolbox.com/air-altitude-pressure-d_462.html

Ted

 

[Sa-Ro]

do some research

Thank for the input.

Below are my observations.

Density is function of pressure and temperature.

Standard temperature and pressure: 15 degree Celsius and 101325 pa.

Normal temperature and pressure: 0 degree Celsius and 101325 pa.

[URL unfurl="true"]https://www.controlandinstrumentation.com/flow/standard.html[/url]

Air density at standard temperature and pressure: 1.225 Kg/m3.

Air density at normal temperature and pressure: 1.292 Kg/m3.

Since my upstream pressure is 6 barg = 7 bar absolute, we need to apply ideal gas law formula:

PV = mRT

Where,
P = Absolute pressure, pascal
V = Volume of substance, m3
m = mass, gram
R = Gas constant,
T = Absolute temperature, kelvin

[URL unfurl="true"]https://www.docbrown.info/page03/3_52gaslaws2.htm[/url]

Calculator: (still looking for step by step example)
[URL unfurl="true"]https://www.omnicalculator.com/physics/air-density[/url]

Arrived density at 6 barg = 8.4 kg/m3..

Rest of the things I will study and come back.

https://www.engineeringtoolbox.com/air-altitude-pr...

Thank you.