A-to-Z Guide to Thermodynamics,
Heat & Mass Transfer, and Fluids Engineering
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True volumetric gas concentration (void fraction)

Ratio of the volume occupied by the gas phase to the total volume of the two-phase system.
Comment. In the case of a one-component two-phase flow of liquid with its vapor, we use the terms "true volume vapor concentration," "volume-flow gas content," and "vapor (gas) quality."

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