Mass conservation equation for multi-component flow

cnqin · September 24, 2024, 06:32

This is the mass conservation equation for multi-component flow in CFX. I am wondering if the densities marked in the red box means the same thing? That is, the ratio of the mass of component i to the volume of the mixed fluid.

evcelica · September 24, 2024, 10:37

No, they do not appear to be the same thing, which should be obvious since they are different symbols, but I tried to follow the equations to double check.
The second one looks like just the normal density of component i.
I'm happy to be corrected though.

Opaque · September 24, 2024, 11:42

Quote:

Originally Posted by cnqin

This is the mass conservation equation for multi-component flow in CFX. I am wondering if the densities marked in the red box means the same thing? That is, the ratio of the mass of component i to the volume of the mixed fluid.

Unfortunately, the image does not display for me.

Would you mind pointing out the Release, Documentation Section, and Equation number?

September 24, 2024, 06:32	Mass conservation equation for multi-component flow	#1
cnqin New Member Xiangjie Qin Join Date: Oct 2023 Posts: 14 Rep Power: 3	This is the mass conservation equation for multi-component flow in CFX. I am wondering if the densities marked in the red box means the same thing? That is, the ratio of the mass of component i to the volume of the mixed fluid.

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September 24, 2024, 10:37		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	No, they do not appear to be the same thing, which should be obvious since they are different symbols, but I tried to follow the equations to double check. The second one looks like just the normal density of component i. I'm happy to be corrected though.