Property Representation of 2-Phase Systems Civil Engineering (CE) Notes | EduRev

Thermodynamics

Civil Engineering (CE) : Property Representation of 2-Phase Systems Civil Engineering (CE) Notes | EduRev

The document Property Representation of 2-Phase Systems Civil Engineering (CE) Notes | EduRev is a part of the Civil Engineering (CE) Course Thermodynamics.
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Property Representation of 2-phase systems:

Consider a system consisting of liquid and vapor phases of a pure component coexisting in equilibrium. The total value of any extensive property of the two-phase system is the sum of the total properties of the phases. Let the total volume of the system be Vt; nL = mass (or moles) of liq, nV = mass (or moles of vapour. 

Then

Property Representation of 2-Phase Systems Civil Engineering (CE) Notes | EduRev

Let Any Molar Thermodynamic Property

Thus, one may write: M = M L + xV M LV                              ...(2.34)

Where, M LV = M V– M                          ...(2.35)

 

It may be noted that M is not a state variable, but an effective molar property of the system. The actual phase rule state variables are Mv and ML. The parameter xV – the mass fraction of vapour phase – in the system if called the ‘quality’. 

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