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Void Fraction and Volume Fraction

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Old   July 28, 2016, 12:37
Default Void Fraction and Volume Fraction
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Hello everyone!
I have a very simple question.
In a boiling flux, is the Vapor Volume Fraction (as it is calculated by FLUENT) the same as the so called Void Fraction?
And then, vapor quality is supposed to be the Vapor Mass Fraction, isn't it?

Thank you in advanced!
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