What is Dryness Fraction?

By Sakshi Yadav|Updated : August 10th, 2022

Dryness fraction is defined as the ratio of the mass of dry vapor (steam) to the combined mass of dry vapor (steam ) and the mass of liquid in the mixture.

Dryness Fraction Formula: X = Dryness (% / 100) νf = Specific Volume of Saturated Water.


What is Dryness Fraction?

The mass fraction of the vapor in the two-phase liquid-vapor regime is called the dryness fraction (or vapor quality). It is represented by x and the formula is: Quality values ​​range from 0 to 1. Although defined as a ratio, quality is often expressed as a percentage.

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