# Mass source term in Fluent 6.3

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 December 25, 2007, 07:36 Mass source term in Fluent 6.3 #1 Esmaeel Guest   Posts: n/a There is a air duct with know velocity inlet and pressure outlet, I want to add a source of water vapor in the middle of the duct with known flow rate and temperature. How can I use the source term menu in Boundary Condition of the water vapor zone? Actually the main problem is that fluent does not get the composition of mass source.

 November 7, 2013, 07:29 Include humidity #2 Senior Member   sunil Join Date: Jul 2012 Location: Bangalore Posts: 128 Rep Power: 6 Hello sir, How can we include relative humidity while defining material in fluent and also which multiphase model we have to use for humidity related calculation Thank you sir sunil M P

 November 10, 2013, 12:58 #3 Senior Member     A-A Azarafza Join Date: Jan 2013 Posts: 205 Rep Power: 6 Hi, sunilpatil You can include relative humidity in your problem by setting the calculated value for water mass fraction in B.C. Relative humidity is defined as: RH=Ph2o/P* From here, by having the value for RH, let say 0.5 for instance, you can now calculate Ph20 and therefore, obtain the mole fraction using: Ph2O=x. P in which, P is total pressure and x is mole fraction. Having the values for mole fraction, you can readily convert them into mass fraction: wi=xi.Mi/Mavg Mavg=sum (xi.Mi) where, wi is mass fraction of the species i and Mavg is average molecular weight of the involved species. I don't know what exactly is your problem, but you can even access the values for RH by getting a contour of it from: Graphic and animation\contours\species and from drop-down option, select "relative humidity". Hope it helps Good luck __________________ Regard yours

 November 28, 2013, 09:24 Relative humidity #4 Senior Member   sunil Join Date: Jul 2012 Location: Bangalore Posts: 128 Rep Power: 6 Hello sir, Thank you for your reply i want define mass fraction in fluent how to do this and also which multiphase model i have to use for these kind of problems. Thank you sir Sunil

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