Can Mass Fractions be Determined from Given Mass Flow Rates?

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pyroknife
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Homework Statement


I'm running a simulation and was given 2 mass flow rates (let's say m1_dot and m2_dot) for 2 chemical species at the inlet.

Homework Equations


mass flow rate = density*velocity * area

The Attempt at a Solution


I need to compute the bulk velocity for the fluid (consisting of the 2 species), so it needs to be some mass-weighted average that I'm computing, but how can I do this when I don't know the mass fractions?
 
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Discussion

Chestermiller said:
Please explain why you think you don't know the mass fractions.
Wait, can the mass fractions be determined from (m1_dot)/(m1_dot+m2_dot) and (m2_dot)/(m1_dot+m2_dot)?
FOr some reason, I didn't think that would work.
 
pyroknife said:
Wait, can the mass fractions be determined from (m1_dot)/(m1_dot+m2_dot) and (m2_dot)/(m1_dot+m2_dot)?
FOr some reason, I didn't think that would work.
Sure.