Ideal Gas/Total Energy gave Joule Thomson (JT) effect
this is a comment, but thoughts are welcome.
I realize ideal gas with "total energy" is the easiest way to model compressibility effects in high speed flow in CFX (im using v15), but i am surprised it also accounts for Joule Thompson (JT) cooling - which i observed flow flow in a pipe. Indeed it was similar to OLGA JT cooling (a 1D pipe simulator). In hindsight maybe that is to be expected, even though an ideal gas is being used, it is still compressible, so JT cooling is still allowed for. Initially I thought a real gas would be required to see JT cooling in CFX |
JT cooling is simply the cooling effect associated with the expansion of a compressible gas. An ideal gas is compressible so can show the effect, so can a real gas. Why is this surprising?
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For more information on this, refer to this link https://www.simulationscience.net/po...n-ansys-fluent |
You are correct: https://en.wikipedia.org/wiki/Joule%...Thomson_effect
You should be able to model the JT cooling in CFX using one of the real gas models in CFX as well. But you have correctly pointed out that ideal gas will not show the effect. Thanks for the correction. |
So it seems what you may be seeing in your simulation would be termed "adiabatic cooling" and not JT cooling?
Ideal gas would have a JT coefficient of zero of course. But Ideal gases can still experience a local temperature change due to pressure change. These are not answers, just discussion and clarification questions. |
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