The apex A property of a Fluid Mixture represented by the junction point of Vapour Liquid Equilibrium (VLE) area on PT diagram of Fluid Mixture (see Fig. 1).
It is characterized by pseudo-critical temperature LaTeX Math Inline |
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and pseudo-critical pressure LaTeX Math Inline |
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.
The simplest estimate of estimate (also called Linear Blending Rule) of Pseudo-Critical Point LaTeX Math Inline |
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is the mole fraction weighted average of the critical temperature LaTeX Math Inline |
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and critical pressure LaTeX Math Inline |
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of fluid components (which are pure substances) :
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T_{pc} = \sum_i x_i \, T_{c,i} |
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pP_{pc} = \sum_i x_i \, pP_{c,i} |
where
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There are other no-linear methods to blend the components to estimate the Pseudo-Critical Point but many engineering applications use Apart from
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and LaTeX Math Block Reference |
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which require fluid composition as the seed and then fit the values to match lab test data.
In case the fluid composition is not known one can use some popular empirical Pseudo-Critical Point Correlations to assess the Pseudo-Critical Point.
See also
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Natural Science / Physics / Thermodynamics / Thermodynamic system
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[ Pseudo-Critical Point (Tpc, pPpc) ][ Pseudo-Critical Temperature (Tpc) ][ Pseudo-Critical Pressure (Ppc)][ Pseudo-Critical Point Correlations @model ]
[ Critical Point (Tc, pPc) ][ Сritical Temperature Temperature (Tc) ][ Critical Pressure (pPc) ]