# Who knows the gas property

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 September 15, 2004, 09:44 Who knows the gas property #1 mjh Guest   Posts: n/a In the PROPS file, the name of the gas NO. 30 is Ideal gas Law for mixture of 3 gases (ENUL=3.6E-5/GRHO). Who can tell me what kind of the gases are the 3? Are they oxygen, nitrogen and steam.

 September 20, 2004, 06:25 Re: Who knows the gas property #2 A User Guest   Posts: n/a Extract From the gxdens file in phoenics/d_earth/d_core below. Look in C:/phoenics/d_earth/d_core/GXDENS.htm for IGRND=5 The code in this routine may help explain. C.... Ideal-gas law for mixture of the three chemical 'species' fuel, C oxidant and product involved in the simple chemical reaction C model (Parameters RHOA,RHOB and RHOC are the molecular weights C of fuel, oxide and products respectively): c

 September 22, 2004, 21:40 Re: Who knows the gas property #3 Carlos Guest   Posts: n/a MJH, N.o 30 is the gas mixture used to achieve the physical properties necessary to SCRS (also called three gases model). I think that, by default, they consider the three gasses to be: methane, air and products (see SCRS entry in enciclopaedia). However, it can be changed to be the reactional system you want (even via VR Editor you can do that). Other option: if you just want to use a mixture of gases that changes its composition throughout time (without any reactions), I think it would be better to create two scalars and combine them with air or oxigen (that would be the domain material), for instance. Then you will need to write an equation that correlates physical properties and these scalars or you can use a phoenics ground code that becomes availabe at properties when scalars are set. Write to my e-mail if you need more details, ok? Regards,

 September 23, 2004, 09:31 Re: Who knows the gas property #4 mjh Guest   Posts: n/a It's very kind of you two to help me with the problem.

 September 27, 2004, 20:19 Re: Who knows the gas property #5 Carlos Eduardo Guest   Posts: n/a Sorry for the delay. I will be sending you an e-mail tomorrow (when I will be at the computer that has PHOENICS). Regards,

 September 29, 2004, 18:07 Re: Who knows the gas property #6 Carlos Guest   Posts: n/a Have you received my e-mail? Regards, Carlos