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Vapor quality : ウィキペディア英語版
Vapor quality

In thermodynamics, vapour quality is the mass fraction in a saturated mixture that is vapour; i.e. saturated vapour has a "quality" of 100%, and saturated liquid has a "quality" of 0%. Vapour quality is an intensive property which can be used in conjunction with other independent intensive properties to specify the thermodynamic state of the working fluid of a thermodynamic system. It has no meaning for substances which are not saturated mixtures (i.e., compressed liquids or superheated fluids).
Quality \chi can be calculated by dividing the mass of the vapour by the mass of the total mixture:
:\chi = \frac}
where m indicates mass.
Another definition used by chemical engineers defines quality (q) of a fluid as the fraction that is saturated liquid. By this definition, a saturated liquid has q = 0. A saturated vapour has q = 1.〔Perry's Chemical Engineers' Handbook (7th Edition), p 13-29〕
==Calculation==
The above expression for vapour quality can be expressed as:
:\chi = \frac,
where y is equal to either specific enthalpy, specific entropy, specific volume or specific internal energy, y_f is the value of the specific property of saturated liquid state and y_-y_ is the value of the specific property of the substance in dome zone, which we can find both liquid y_ and vapor y_.
Another expression of the same concept is:
:\chi=\frac
where m_v is the vapour mass and m_l is the liquid mass.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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