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Behaviour of Cryogenic Liquid Nitrogen

Behaviour of Cryogenic Liquid Nitrogen

Behaviour of Cryogenic Liquid Nitrogen

(OP)
What will happen to liquid nitrogen in a storage vessel if the pressure is increased beyond its critical point pressure (33.99 bar abs)? Will it remain as liquid?

RE: Behaviour of Cryogenic Liquid Nitrogen

Yes. You can place as much pressure as you like on a liquid. Above the critical temperature there is no difference between liquid and vapor phase so, basically, the phases do not exist.

RE: Behaviour of Cryogenic Liquid Nitrogen

(OP)
Hi Compositepro,

Thanks for your reply. Does this means above the critical temperature, will it remain as liquid?

RE: Behaviour of Cryogenic Liquid Nitrogen

Leongw,


Assuming the initial temperature is -320F and pressure is atmospheric (14.69 psia), it will just remain a liquid until the critical temperature is reached due to heat transfer in the vessel. Then once you reach the critical temperature and stay above the critical pressure, it will be a supercritical fluid.

 

RE: Behaviour of Cryogenic Liquid Nitrogen

Then things get wierd.  Pipe transport will probably deliver a volume equivalent to what you would get if it was a liguid, but at the pressure drop you would expect for a gas.

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