# Mass fraction via Cel file at outlet

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 April 6, 2003, 15:53 Mass fraction via Cel file at outlet #1 Jens Guest   Posts: n/a Hi, I have a problem when I would like to calculate the averaged mass fraction of a mixture at thought the outlet. The case is mixing two fluids in a large tank. The fluid is extracted using an outlet with a pump and then injected at another possition in the tank. How can I calculate the averaged mass fraction thought the outlet area and then use this to specify the mass fraction at the inlet ??? Thanks. Regards Jens

 April 7, 2003, 10:49 Re: Mass fraction via Cel file at outlet #2 Robin Guest   Posts: n/a Hi Jens, Assuming a multicomponent fluid called "Fluid", a component named "componentA", and you are measuring flow at a boundary named "Outlet", the following expression will do the trick: massFlowAve(Fluid.componentA.mf)@Outlet Regards, Robin

 April 7, 2003, 11:54 Re: Mass fraction via Cel file at outlet #3 windhair Guest   Posts: n/a In CFX 4, you can write a output file using Command file: :>PATCH DATA PATCH NAME 'OUTLET' FILE NAME 'OUTLETAVERAGE.DAT' AVERAGE SPEICES1 EACH TIME STEP

 April 28, 2003, 09:14 Re: Mass fraction via Cel file at outlet #4 Jens Guest   Posts: n/a Hi I am having some problem setting the mass fraction using the method you describe. I keep getting error: "and then error found at item: massFlowAve unrecognised name Error processing expression: Mass Fraction = scAn error has occurred in cfx5solve: " I define the massfraction in the cel file as: sc = massFlowAve(Mixture.SodiumChlorite.mf)@outlettop Can you give me any hints on what the problem is ??? Thanks Regards Jens

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