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-   -   multicomponent flow-component mass fraction at inlet (http://www.cfd-online.com/Forums/cfx/95845-multicomponent-flow-component-mass-fraction-inlet.html)

mengyue1 January 5, 2012 00:49

multicomponent flow-component mass fraction at inlet
 
hi guys, i am simulating the diffusion of h2 in a containment. The mixture consisting of h2 and h2o is injected into a containment, the total mass flow rate of the mixture is 1.0 kg/s and the mass fractions of h2 and h2o are 0.2 and 0.8, respectively. At first, the containment is full of h2o and air. in CFX-Pre, i set the total mass flow rate and the component(h2 and h2o) mass fraction.
when the calculation is completed, i find the the h2 mass fraction at inlet is not 0.2 which i set in the CFX-Pre. (By the way, i use areaAve(H2. mass fraction)@INLET to obtain the h2 mass fraction at inlet). i am confused about this, dose anyone know how to solve this problem?
Thanks in advance!


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