# Species volume fraction

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 March 18, 2010, 12:54 Species volume fraction #1 Senior Member     Sebastian Gatzka Join Date: Mar 2009 Location: Frankfurt, Germany Posts: 729 Rep Power: 12 Hello world. How can I determine which volume fraction a species occupies in one cell? sega __________________ Schrödingers wife: "What did you do to the cat? It's half dead!"

 March 20, 2010, 15:51 #2 Senior Member     Sebastian Gatzka Join Date: Mar 2009 Location: Frankfurt, Germany Posts: 729 Rep Power: 12 Come on guys. This can't be so tought. __________________ Schrödingers wife: "What did you do to the cat? It's half dead!"

 March 22, 2010, 12:18 #3 Member   Allan Walsh Join Date: Mar 2009 Posts: 55 Rep Power: 9 Um, what do you mean by "which volume fraction"? For example, the bottom, right corner of the cell? I'm guessing you mean you want to convert the mass fraction to volume fraction. This can be done using the cell density, molecular weight, and the molecular weight of the species of interest. I believe there is an example of this in the UDF manual under the macro for volume reaction rate.

March 22, 2010, 12:37
#4
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Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 12
Quote:
 Originally Posted by Allan Walsh Um, what do you mean by "which volume fraction"? For example, the bottom, right corner of the cell? I'm guessing you mean you want to convert the mass fraction to volume fraction. This can be done using the cell density, molecular weight, and the molecular weight of the species of interest. I believe there is an example of this in the UDF manual under the macro for volume reaction rate.
Yes you are guessing right: mass fraction / mole fraction to volume fraction would be nice.

There are two examples for the volumetric reaction rate in chapter 2.3.27.
None enlightens me how this should be possible.

Do you have an equation how this works?
I'm sure I can handle the programming part of it ...
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 November 27, 2011, 12:17 udf #5 New Member   arash Join Date: Jun 2011 Posts: 7 Rep Power: 7 hi, can i modelling asphaltene precipitation that exist in crude oil by uusing ceramic filter monolit by defult formolation in fluent? i want to modelling separation of asphaltene from crude oil by 19-channel ceramic filter,but i think it is not define in FLUENT that precipitate asphaltene on surface of ceramic channel base on diffrences between pore size. i must write UDF for this porpuse or not? most of oil flow must pass through the membrane wall and most of asphaltene must form a gel-layer and precipitation on inner surface od channel. please help me as soon as possible thank you so much

April 16, 2014, 02:02
#6
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sarighulikhan
Join Date: Mar 2014
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Quote:
 Originally Posted by sega Hello world. How can I determine which volume fraction a species occupies in one cell? sega
write C_VOF( , )

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