- #1
Lyd_h
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<Moderator's note: Moved from a homework forum.>
Dear team, I wish to use CO2 to de-air a device by exploiting the physical properties of CO2 as a heavier, more dense gas to air and therefore displace air in a very thin tube that has a nozzle at the end where both air and CO2 can escape.
I wish to know under what conditions should I study CO2 to effectively remove air. I think that I would need a high flow rate to ensure that diffusion with air within the tube is counteracted, a low velocity of CO2 to ensure laminar flow within the tube to reduce turbulence of CO2 and again ensure optimal air displacement, and deliver the CO2 at a high pressure and high pressure leads to low velocity.
The CO2 would be delivered from a standard cylinder tank that has a pressure gauge attached to it. A CO2 flow meter is attached to the pressure gauge and from the flow meter, 1/4inch tubing of length 120cm is then attached to the device which itself is about 120cm long and has an internal diameter of 8mm.
As there may be a pressure drop along the length of the CO2 tube and device tube, I am not sure if I need to also take this into account.
I thought about having a flow meter at the end of the device where CO2 comes out to look at what flow rate is actually coming out of the device.
2. Homework Equations
Ficks law
Grahams Law
Bernoulli's equation
3. The Attempt at a Solution
Have yet to test out the above assumptions.
Dear team, I wish to use CO2 to de-air a device by exploiting the physical properties of CO2 as a heavier, more dense gas to air and therefore displace air in a very thin tube that has a nozzle at the end where both air and CO2 can escape.
I wish to know under what conditions should I study CO2 to effectively remove air. I think that I would need a high flow rate to ensure that diffusion with air within the tube is counteracted, a low velocity of CO2 to ensure laminar flow within the tube to reduce turbulence of CO2 and again ensure optimal air displacement, and deliver the CO2 at a high pressure and high pressure leads to low velocity.
The CO2 would be delivered from a standard cylinder tank that has a pressure gauge attached to it. A CO2 flow meter is attached to the pressure gauge and from the flow meter, 1/4inch tubing of length 120cm is then attached to the device which itself is about 120cm long and has an internal diameter of 8mm.
As there may be a pressure drop along the length of the CO2 tube and device tube, I am not sure if I need to also take this into account.
I thought about having a flow meter at the end of the device where CO2 comes out to look at what flow rate is actually coming out of the device.
2. Homework Equations
Ficks law
Grahams Law
Bernoulli's equation
3. The Attempt at a Solution
Have yet to test out the above assumptions.
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