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Old   July 30, 2002, 23:44
Default Volume fraction to mass fraction
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Torsaki
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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

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Old   July 31, 2002, 10:37
Default Re: Volume fraction to mass fraction
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Robin
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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

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Old   August 6, 2002, 00:36
Default Re: Volume fraction to mass fraction
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Hi all,
If i have volume fraction and i want to cover to concentrition how can i do?Thanknew user
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Old   August 13, 2002, 16:01
Default Solution Method in CFX 5.5.1
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hamza
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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?
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Old   August 14, 2002, 08:56
Default Re: Solution Method in CFX 5.5.1
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Robin
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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
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Old   December 25, 2010, 01:35
Default mass fraction to (%vol/vol)
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Mahwish
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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.
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Old   December 25, 2010, 05:12
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You use the gas densities to convert mass fraction to volume fraction, as described above.
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Old   August 19, 2011, 11:23
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Mitch Olson
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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
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Old   August 21, 2011, 00:40
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Thanks a lot for your answere . I apreciate it
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Old   February 21, 2015, 11:46
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I tank U too, deer Olsan
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