Thermodynamic Properties of high pressure gases

AI Thread Summary
Thermodynamic properties of high-pressure gases, particularly the kinematic and absolute viscosity of air at 300 K and 330 bar, are discussed. Users suggest resources like the NIST webbook and REFPROP 8.0 for accurate data, noting that aerospace companies have proprietary air tables that may vary significantly. One contributor calculated the kinematic viscosity as 0.00000090477 ft²/s using ASPEN software, while another provided dynamic viscosity values. The discussion emphasizes the importance of reliable sources for thermodynamic properties and the need for accurate calculations for varying pressures and temperatures. Access to specialized software and databases is crucial for obtaining precise viscosity data.
0507476h
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Hi,

Anyone know where I can find thermodynamic properties of gases at high pressure? More specifically I need to find the kinematic viscosity or the absolute viscosity of air at around 300 degrees Kelvin and 330 bar.

Cheers
 
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It depends on what gas and who you talk to. All the major aerospace companies for example have their own version of air tables (for high temp/high pressure). They can vary quite significantly.
 
http://webbook.nist.gov/chemistry/fluid/" should have the data you're after. Otherwise, a thermodynamic properties of air table at the local school library would have it too. You might even be able to find a table online if you search in google for "themodynamic properties of air."
 
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0507476h said:
Hi,

Anyone know where I can find thermodynamic properties of gases at high pressure? More specifically I need to find the kinematic viscosity or the absolute viscosity of air at around 300 degrees Kelvin and 330 bar.

Cheers

Air @ 300 K and 330 bar:

Kin. Viscosity = 0.00000090477 (ft²/s)

CS
 
stewartcs said:
Air @ 300 K and 330 bar:

Kin. Viscosity = 0.00000090477 (ft²/s)

CS



Thank-you for this, could you tell me how you calculated/where you found this data? Just so I can do it for myself in future as I reckon I will have a range of other pressures and temps to calculate kinematic viscosity for in future.

Thanks
 
0507476h said:
Thank-you for this, could you tell me how you calculated/where you found this data? Just so I can do it for myself in future as I reckon I will have a range of other pressures and temps to calculate kinematic viscosity for in future.

Thanks

NIST has a program called REFPROP 8.0 that gives this information. Check the link above from Mech_Engineer and they will probably have a link for it. It cost $200 for copy last time I checked.

CS
 
Hi
I used ASPEN to find the answer
At 300K and 330 bar
Dynamic Viscosity=0.0299 cp =2.99e-5 Pa.sec
Kinematic Viscosity=8.566e-8 m^2/sec
 

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