# volume concentration

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 September 27, 2010, 00:40 volume concentration #1 New Member   seok jun Join Date: Sep 2010 Posts: 3 Rep Power: 8 I have some queation using CFX. Dispersion problem. rectangle box. initial condition : air in rectangle box boundary condition : inlet(Hydrogen mass flow), openning 1. I can not fine volume concentration in CFX-post. (just mass concentration, mass fraction) 2. How conversion to volume concentration.

 September 27, 2010, 06:33 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 You can calculate it from the mass fraction and molar masses of the components. I will leave the derivation of the equation up to you from there.

 September 27, 2010, 07:03 #3 New Member   seok jun Join Date: Sep 2010 Posts: 3 Rep Power: 8 Thank you for your comment. But I don't know conversion equation.

 September 27, 2010, 07:11 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100

 September 27, 2010, 07:27 #5 New Member   seok jun Join Date: Sep 2010 Posts: 3 Rep Power: 8 I need to Hydrogen Volume Concentration (Vol %). (Time series value on sensor(points)) Hydrogen density : 0.09 Air density : 1.205 If the sample is a mixture containing N components, the molar volume is calculated using ~~~/ what is the Xi?

 September 30, 2010, 03:42 #6 Senior Member   Matthias Voß Join Date: Mar 2009 Location: Berlin, Germany Posts: 446 Rep Power: 12 hi if V is m3/mol and M is mol what could possibly x_i be? It is Mass_i/Total_Mass (MassFraction), and if you sum up over i components you end up in a weighted Molar Mass. This divided by the weighted Density of the Mixture is the Molar Volume. neewbie P.S.: next time i´ll find the Latex button in the beginning. Last edited by mvoss; September 30, 2010 at 08:06.

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