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-   -   volume fraction, Mass fraction and Bulk Mass flow (http://www.cfd-online.com/Forums/cfx/22074-volume-fraction-mass-fraction-bulk-mass-flow.html)

Dr.jones January 22, 2006 21:59

volume fraction, Mass fraction and Bulk Mass flow
 
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??

Thanks

Andreas January 25, 2006 05:32

Re: volume fraction, Mass fraction and Bulk Mass f
 
hello,

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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