Can fluent calculate the Joule-Thomson effect ?

ruanbl · July 27, 2011, 08:45

Hi,

I'm calculating the isothermal fluid flow of CO2 in a vertical long pipe (with the diameter of 0.5 m and length of 1000m). The CO2 is injected into the pipe from top (mass flow rate inlet boudary condition) and goes out from the bottom (pressure outlet boundary condition). The operating density is set to be 0 and the operating pressure is set to be 35MPa. The absolute pressure of CO2 in the pipe is around 10~35 MPa (most of the pressure is built by gravity of the supercritical CO2 fluid).

Density-based solver and NIST real-gas fluid properties are used. However, after the calculation is converged, it is found that the entropy of CO2 decreased from the top to bottom of the pipe, which is against the second law of thermodymanics.

It seems that FLUENT didn't consider the Joule-Thomson heating introduced by gravity, however, it is written in FLUENT manual that if the coupled solver (density-based solver) is chosen for a compressible fluid, the pressure work term will be included in the calculation automatically.

It confuses me for a long time

. Can anyone help me on this? Thanks a lot!

ruanbl

ruanbl · July 30, 2011, 11:44

no one knows?

aggie · March 11, 2012, 06:24

I am also trying to understand the same thing.
If you have found something, please share it with me.

Thanks.

syavash · April 2, 2012, 14:29

Hi,
I have a similar problem,
Could you solve j-t effect modeling using fluent?

July 27, 2011, 08:45	Can fluent calculate the Joule-Thomson effect ?	#1
ruanbl New Member Ruanbl Join Date: Mar 2009 Posts: 3 Rep Power: 17	Hi, I'm calculating the isothermal fluid flow of CO2 in a vertical long pipe (with the diameter of 0.5 m and length of 1000m). The CO2 is injected into the pipe from top (mass flow rate inlet boudary condition) and goes out from the bottom (pressure outlet boundary condition). The operating density is set to be 0 and the operating pressure is set to be 35MPa. The absolute pressure of CO2 in the pipe is around 10~35 MPa (most of the pressure is built by gravity of the supercritical CO2 fluid). Density-based solver and NIST real-gas fluid properties are used. However, after the calculation is converged, it is found that the entropy of CO2 decreased from the top to bottom of the pipe, which is against the second law of thermodymanics. It seems that FLUENT didn't consider the Joule-Thomson heating introduced by gravity, however, it is written in FLUENT manual that if the coupled solver (density-based solver) is chosen for a compressible fluid, the pressure work term will be included in the calculation automatically. It confuses me for a long time . Can anyone help me on this? Thanks a lot! ruanbl Last edited by ruanbl; July 27, 2011 at 11:46.

July 30, 2011, 11:44		#2
ruanbl New Member Ruanbl Join Date: Mar 2009 Posts: 3 Rep Power: 17	no one knows? eng.nassim likes this.

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March 11, 2012, 06:24		#3
aggie Member Jack Join Date: Mar 2010 Posts: 32 Rep Power: 16	I am also trying to understand the same thing. If you have found something, please share it with me. Thanks.

April 2, 2012, 14:29		#4
syavash Senior Member Syavash Asgari Join Date: Apr 2010 Posts: 473 Rep Power: 18	Hi, I have a similar problem, Could you solve j-t effect modeling using fluent?