Flow Rate Experiment: Measuring Gas Flow vs Theory

[g0ggs123]

Measured rate of gas flow vs theoretical rate of gas flow

I am looking to set up an experiment to determine the maximum flow rate of gas through a 1/4" tubing.

I have a spreadsheet which calculates the theoretical rate. The modified Darcy equation was used to calculate the mass flow of gas through the tubing when choked flow is present.

(Quick question - any other ways of calculating either better or worse?)

I would be looking to achieve the following conditions:

upstream pressure - 120barg
downstream pressure - atm
pipe ID - 0.125"
Length of tubing - 600m (I know that a shorter length will create larger flow rates but is there any way I can reduce this length for ease of experiment and still get comparable results if the theoretical rate was calculated using 600m length?)

Would Nitrogen be a good gas to use with this test?

I have a flow meter which produces a digital read out of the results so would it be a case of connecting that to one end of the tubing and pumping nitrogen through the other end?

Also what would the general rig up look like?


Cheers

 

[Navin A S]

.Yes, nitrogen is a good gas to use with this test. You can reduce the length of tubing for the experiment, but you should make sure that the results are comparable to the theoretical rate calculated using the 600m length. The general rig up should include a pressure regulator and gauge on each end of the tubing. At the upstream end, the pressure regulator should be set to 120barg, while the downstream pressure should be set to atmospheric pressure. The flow meter should be connected to the downstream end of the tubing. The flow meter should be calibrated before the experiment to ensure accurate readings.