Nozzle Velocity Separator
Nozzle Velocity Separator
(OP)
Good Afternoon,
I would like to know how to calculate the velocity of the gaz in outlet nozzle of separator.
It is a 2 phases separator. I have the flow, the density, the viscosity of the gas.
Thank you for your help
I would like to know how to calculate the velocity of the gaz in outlet nozzle of separator.
It is a 2 phases separator. I have the flow, the density, the viscosity of the gas.
Thank you for your help





RE: Nozzle Velocity Separator
flow / nozzle area = velocity
RE: Nozzle Velocity Separator
Actually I thought also about this formula but as it seems too easy I was not sure...
The problem is when I do the calculation flow / nozzle area = velocity I found 180 m/s....
too huge I think...
RE: Nozzle Velocity Separator
In my experience the value you mentioned (180 m/s) seems a bit too high for a natural gas line (but could be acceptable for different purposes), I would check the values of gas density and flow, then calculate the speed of sound and compare values with the velocity at maximum flow.
RE: Nozzle Velocity Separator
Thank you for your response.
The flow rate is 10 MMscfd, the diameter of the nozzle is 6 inch...maybe I did a mistake in my formula.
The density of the gas is 33kg/m3 and viscosity 0.0129 cp.
I will try to see is the flow is correct.
Thanks again
Regards,
RE: Nozzle Velocity Separator
presuming natural gas with a density of 0.75 Kg/M3 (at std. cond.)
10 MMscfd -> 10 * 1000000 MMscfd / 35.31 / 3600 -> SM3/s * 0.75 Kg/M3 -> 58.95 kg/s
58.95kg/s -> 58.95Kg/s / 33Kg/M3 -> 1.78 M3/s (at operating conditions)
internal area (6 inches) -> 0.017 M2
1.78 M3/s / 0.017M2
should be something about 100 M/s
(hoping there are not too much errors in my conversion...)
you can calculate the speed of sound with a process simulator or some free tool as for example http://www.prode.com/en/properties.htm
then compare the values.
RE: Nozzle Velocity Separator
presuming natural gas with a density of 0.75 Kg/M3 (at std. cond.)
10 MMscfd -> 10 * 1000000 MMscfd / 35.31 / 86400 -> SM3/s * 0.75 Kg/M3 -> 2.45 kg/s
2.45kg/s -> 2.45Kg/s / 33Kg/M3 -> 0.075 M3/s (at operating conditions)
internal area (6 inches) -> 0.017 M2
0.075 M3/s / 0.017M2
should be something about 5 M/s
(sorry, out of office and doing conversions by hand...)
RE: Nozzle Velocity Separator
Thank you PaoloPemi for your explanation. I have another question why do we consider natural gas?
Thank you
Best Regards,
RE: Nozzle Velocity Separator
RE: Nozzle Velocity Separator
Thank you a lot for all your explanation. I get the composition of the gas and I calculated the velocity.
Merci again
Best Regards,