Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
(OP)
Hi all,
I am currently studying the application using the supercritical carbon dioxide as the process fluid. I am just wondering, will there be any problem if I introduce the carbon dioxide at liquid phase first, then only raise the temperature until the carbon dioxide becomes supercritical carbon dioxide after some time. Seriously I do not know what will happen inside the pipeline. I only know the density change will be huge. Is that anyone has the related experience over here?
Thank you for your time!
I am currently studying the application using the supercritical carbon dioxide as the process fluid. I am just wondering, will there be any problem if I introduce the carbon dioxide at liquid phase first, then only raise the temperature until the carbon dioxide becomes supercritical carbon dioxide after some time. Seriously I do not know what will happen inside the pipeline. I only know the density change will be huge. Is that anyone has the related experience over here?
Thank you for your time!





RE: Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
RE: Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
what lengths, flows?
The phase diagrams of pure CO2 with density are well known and easily found. Example below - scroll down for the graph.
http://what-when-how.com/nanoscience-and-nanotechn...
Mass flow will remain the same therefore if density goes down, velocity goes up.
The benefit of liquid or super critical CO2 is that the viscosity is very low.
CO2 with contaminants, even small amounts ( 1-2%) make those diagrams invalid and you need to do some specific testing.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
RE: Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
https://www.youtube.com/watch?v=-gCTKteN5Y4
https://www.youtube.com/watch?v=GEr3NxsPTOA
https://www.youtube.com/watch?v=zu-S1GxmkCo
Dejan IVANOVIC
Process Engineer, MSChE
RE: Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
RE: Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
RE: Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
Heating co2 at a pressure above 75odd bar will mean you transition from liquid to supercritical. Unless your volume increases then so will your pressure as the density reduces. That pressure rise could be quite big.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
Thanks for your response. Yes, basically the CO2 will be flowing inside a fixed volume of pipe and the pressure will drop across the pipe.
RE: Phase Change of Supercritical CO2 (from liquid to supercritical fluid)
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.