# Argon properties

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 November 4, 2003, 14:45 Argon properties #1 Oleg Melnik Guest   Posts: n/a I am trying to reproduce shock tube experiments done with argon at pressure drop up to 40 MPa. For this I need good data for physical properties of argon at high pressure and temperature range including equation of state, gas-liquid transition conditions, latent heat of evaporation as a function of pressure and temperature. Could you suggest me good references. I am also interested in viscosity of argon as I'll have to calculate gas-particle interaction later. Best regards, Oleg

 November 4, 2003, 14:50 Re: Argon properties #2 Oleg Melnik Guest   Posts: n/a In addition maybe there are some papers with similar simulations?

 November 4, 2003, 15:45 Re: Argon properties #3 BAK_FLOW Guest   Posts: n/a Hi, give the following online source a try. http://webbook.nist.gov/chemistry/ Regards, Bak_Flow

 November 4, 2003, 15:58 Re: Argon properties #4 Oleg Melnik Guest   Posts: n/a Thank you for the good reference! Oleg

 November 5, 2003, 03:44 Re: Argon properties #5 Michael Guest   Posts: n/a I recently did a simulation of a shock wave passing over a cone in argon gas for a benchmark study, however the mach number was not very high (M=2.38). For this simulation I used Sutherland's law for viscosity which is ok for temperatures below say 1000 degrees. For very high temperatures you will need to take into account thermochemical effects such as dissociation.

 November 5, 2003, 05:17 Re: Argon properties #6 Oleg Melnik Guest   Posts: n/a Michael, Did you look at the other end, when you have strong rarefaction in Argon and temperature can drop down to say 100 K and condensation starts? I think in my shock tube calculations this is the case. I wonder if there is en equation of state that I can use to cover both states of argon? Oleg

 November 6, 2003, 20:39 Re: Argon properties #7 Michael Guest   Posts: n/a Hi Oleg, For the problem I was simulating the temperatures did not get that low. What experiment are you trying to simulate? What is the setup of this experiment?

 November 7, 2003, 05:41 Re: Argon properties #8 Oleg Melnik Guest   Posts: n/a I have a classical shock tube setup. High pressure chamber is filled with argon at up to 40 MPa. I get low temperatures in my calculations when the rarefaction wave reflects from the bottom of the tube (located vertically). For some time I have temperatures less then 100 K with high enough pressures to overcome gas-liquid transition. The big question of course the nucleation time of the droplets. If it's long enough the fraction of liquid will be small. I don't have pressure signal measured at the bottom that reflects any strange behaviour but I want be sure that liquid transition is not important in my case as I plan to do calculations of gas-particle dispersion behaviour with the same setup. Hope it helps, Oleg

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