Volume fraction to mass fraction
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 
Re: Volume fraction to mass fraction
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 
Re: Volume fraction to mass fraction
Hi all,
If i have volume fraction and i want to cover to concentrition how can i do?Thanknew user 
Solution Method in CFX 5.5.1
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? 
Re: Solution Method in CFX 5.5.1
Hi Hamza,
Simply put, CFX5 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.cfdonline.com/Forum/cfx_...e.cgi?read=934, or contact CFX. Regards, Robin 
mass fraction to (%vol/vol)
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. 
You use the gas densities to convert mass fraction to volume fraction, as described above.

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/wf11)) vf2=1/(1+(rho2/rho1)*(1/wf21)) 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 
Thanks a lot for your answere . I apreciate it

I tank U too, deer Olsan

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