Pressure-Volume Diagram for a Vapor-Liquid Mixture
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This Demonstration shows the phase behavior of 1 mol of water on a log pressure versus log volume (-) phase diagram.
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Contributed by: Adam J. Johnston and Rachael L. Baumann (April 2019)
Additional contributions by: John L. Falconer
(University of Colorado Boulder, Department of Chemical and Biological Engineering)
Open content licensed under CC BY-NC-SA
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Mass and energy balances are used to calculate the pressure and quality when two phases are present:
,
,
where
is internal energy (J/mol) at (the initial condition),
is heat added (J),
is vapor quality,
is internal energy (J/mol) at the final condition,
is volume (),
and the superscripts and refer to liquid and vapor.
The internal energy at pressure is
,
.
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