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titleDerivation


LaTeX Math Block
anchorcg1cZ
alignmentleft
c = -\frac{1}{\rho} \frac{1d\rho}{Vdp}  = \frac{dVd \ln \rho}{dp} = - \frac{d }{dp} \left(  \ln V \left(\frac{p}{Z} \right)  \rightarrow \ln right) = \frac{Z}{p} \cdot \frac{d }{dp} \left(\frac{Vp}{V_0Z} \right) = - \int_{p_0}^p c(p) dp 
Substituting
LaTeX Math Inline
bodyV
from
LaTeX Math Block Reference
anchorZ
into
\frac{Z}{p} \cdot \left( \frac{1}{Z} + p \cdot \frac{d }{dp} \left( \frac{1}{Z} \right)   \right) = \frac{1}{p}  - \frac{1}{Z} \frac{dZ}{dp}

Integrating 

LaTeX Math Block Reference
anchor

cg1

cZ

one

 one arrives

to

to 

LaTeX Math Block Reference
anchorZ_c
.



The
Z-factor value is trending towards unit value (

LaTeX Math Inline
bodyZ \rightarrow 1
) for incompressible fluids and linear pressure dependence (
LaTeX Math Inline
bodyZ \rightarrow a \cdot p
) for strongly compressible Fluids.

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