# Volume fraction to mass fraction

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 July 30, 2002, 23:44 Volume fraction to mass fraction #1 Torsaki Guest   Posts: n/a hi, all friend I have the value of volume fraction in my result and i want to change the volume fraction to mass fraction or concentration. How i do? Torsaki

 July 31, 2002, 10:37 Re: Volume fraction to mass fraction #2 Robin Guest   Posts: n/a Hi Torsaki, Look to the units for the answer... To get the mass fraction, multiply by the density ratio of the two materials: ((m^3)_1/(m^3)_2)*(kg/m^3)_1/(kg/m^3)_2=(kg_1/kg_2) You can use a similar method to convert to concentration. Robin

 August 6, 2002, 00:36 Re: Volume fraction to mass fraction #3 New User Guest   Posts: n/a Hi all, If i have volume fraction and i want to cover to concentrition how can i do?Thanknew user

 August 13, 2002, 16:01 Solution Method in CFX 5.5.1 #4 hamza Guest   Posts: n/a hi any one, I want to know as soon as possible what the Alogarethim solution method use in the CFX 5.5.1 is it SIMPLE method or another method?

 August 14, 2002, 08:56 Re: Solution Method in CFX 5.5.1 #5 Robin Guest   Posts: n/a Hi Hamza, Simply put, CFX-5 uses a coupled multigrid approach whereby the hydrodynamic equations (u,v,w,p) are solved simultaneously in a single matrix at each timestep. For a more thorough explanation, see http://www.cfd-online.com/Forum/cfx_...e.cgi?read=934, or contact CFX. Regards, Robin

 December 25, 2010, 00:35 mass fraction to (%vol/vol) #6 New Member   Mahwish Join Date: Oct 2009 Posts: 7 Rep Power: 16 HI all I am totally lost in the conversion .I need to convert mass fraction to (vol/vol)%. I ahve two gases 0.316 of FReon and 0.684 of Nitrogen.

 December 25, 2010, 04:12 #7 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,729 Rep Power: 143 You use the gas densities to convert mass fraction to volume fraction, as described above.

 August 19, 2011, 11:23 #8 New Member   Mitch Olson Join Date: Aug 2011 Posts: 1 Rep Power: 0 It looks like I was having the same problem to convert from mass fraction to volume fraction. Here is the formula: vf1=1/(1+(rho1/rho2)*(1/wf1-1)) vf2=1/(1+(rho2/rho1)*(1/wf2-1)) where, vf1=phase 1 volume fraction vf2=phase 2 volume fraction wf1=phase 1 mass fraction wf2=phase 2 mass fraction rho1=phase 1 density rho2=phase 2 density PS. To double check you correctly entered the formula check that vf1 + vf2 = 1 evcelica, aerospace84, soheil_r7 and 3 others like this.

 August 21, 2011, 00:40 #9 New Member   Mahwish Join Date: Oct 2009 Posts: 7 Rep Power: 16 Thanks a lot for your answere . I apreciate it

 February 21, 2015, 10:46 #10 New Member   Join Date: Jul 2013 Posts: 16 Rep Power: 12 I tank U too, deer Olsan

 March 10, 2018, 03:41 #11 New Member   Adhavan K Join Date: Mar 2018 Posts: 3 Rep Power: 8 Could anyone please explain the formula mathematically. I am getting value more than one when added the mass fractions.

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