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LaTeX Math Block
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\left(\rho(p) -  j_m^2 \cdot c(p)   \right)  \frac{dp}{dl} = \rho^2(p) \, g \, \cos \theta(l)  - \frac{ j_m^2 }{2 d} \cdot  f({\rm Re}, \, \epsilon)



LaTeX Math Block
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p(l=0) = p_0




LaTeX Math Block
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u(l) = \frac{\rho_0 \cdot q_0j_m}{\rho(T(l), p(l))) \cdot A}



LaTeX Math Block
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q(l) = \frac{\rho_0A \cdot q_0}{\rho(T(l),p(u(l))}


where

LaTeX Math Inline
body--uriencoded--\displaystyle j_m =\frac%7B \rho_0 \, q_0%7D%7BA%7D

mass flux

LaTeX Math Inline
bodyq_0 = q(l=0)

Fluid flowrate at inlet point (

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bodyl=0
)

LaTeX Math Inline
body\rho_0 = \rho(T_0, p_0)

Fluid density at inlet point (

LaTeX Math Inline
bodyl=0
)

LaTeX Math Inline
body\rho(l) = \rho(T(l), p(l))

Fluid density at any point 

LaTeX Math Inline
bodyl

LaTeX Math Inline
bodyс(p)

Fluid Compressibility

LaTeX Math Inline
body--uriencoded--f(%7B\rm Re%7D, \, \epsilon)

Darcy friction factor

LaTeX Math Inline
body--uriencoded--\displaystyle %7B\rm Re%7D = \frac%7Bj_m \cdot d%7D%7B\mu(T, p)%7D

Reynolds number in Pipe Flow

LaTeX Math Inline
body--uriencoded--\displaystyle d = \sqrt%7B \frac%7B4 A%7D%7B\pi%7D%7D

Characteristic linear dimension of the pipe

(or exactly a pipe diameter in case of a circular pipe)

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