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volume fraction, Mass fraction and Bulk Mass flow

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Old   January 22, 2006, 20:59
Default volume fraction, Mass fraction and Bulk Mass flow
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Hi! all friend I have a confusing problem when I try to set the value of "volume fraction" in the inlet condition fluid values tab for a gas-liquid two phase problem. If I give the value of volume fraction of different phase, what values should I give to the "Normal speed" of the two flow??are these values also apparent velocity or I should give a same velocity?? this problem confused me and I always give Mass flow rate for every flow.

by the way, when I select "Bulk Mass flow rate" in Boundary Details tab of inlet, I find the volume fraction in the fluid values tab means Mass fraction!(you can find this conclusion from the result file using CFX-POST).Is it true??

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Old   January 25, 2006, 04:32
Default Re: volume fraction, Mass fraction and Bulk Mass f
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I also am working on multiphase flows. Since both fluids stream in at the same velocity you must of course set the same velocity as a boundary condition. This is equivalent to setting the specific massflow of each fluid.
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