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FlowrateMassFlowrate\dot A cdot \Intake  Volumetric Mass FluxMassFluxjm
Pressure profile along the pipe


LaTeX Math Block
anchorPressureProfile
alignmentleft
F(p, l)=\left(  \frac{1}{\rho^2} - \frac{1}{\rho_0^2}   \right)  
+ \left(  \frac{f}{\rho^2} + \frac{f_0}{\rho_0^2}   \right)  
\cdot \frac{l}{ 2 \, d}  - (2/j_m^2) \,  \int_p^{p_0} \frac{dp}{\rho} - (2/j_m^2) \, g \, \Delta z(l) = 0


Mass Flux


LaTeX Math Block
anchor
MassFlux
alignmentleft
j_m =  
\
sqrt{ 2 \cdot \frac
{
g \, \Delta z + \int_p^{p_0} \frac{dp}{\rho}
}
{
\left(  \frac{1}{\rho^2} - \frac{1}{\rho_0^2}   \right)  
+ \left(  \frac{f}{\rho^2} + \frac{f_0}{\rho_0^2}   \right)  
\cdot \frac{l}{ 2 \, d}
}
}


Mass Flowrate


LaTeX Math Block
anchorVolumtericFlowrateMassFlowrate
alignmentleft
q_0\dot m =  
\frac{A}{\rho_s} \cdot \sqrt{ 2 \cdot \frac
{
g \, \Delta z + \int_p^{p_0} \frac{dp}{\rho}
}
{
\left( \frac{1}{\rho^2} - \frac{1}{\rho_0^2} \right) 
+ \left( \frac{f}{\rho^2} + \frac{f_0}{\rho_0^2} \right) 
\cdot \frac{l}{ 2 \, d}
}
}


Intake  Volumetric Flowrate


LaTeX Math Block
anchor
VolumtericFlowrate
alignmentleft
q_
0 =  
\frac{A}{\rho_s} \cdot \sqrt{ 2 \cdot \frac
{
g \, \Delta z + \int_p^{p_0} \frac{dp}{\rho}
}
{
\left( 
\frac{1}{\rho^2} - \frac{1}{\rho_0^2}
 \right)
 
+ \left( 
\frac{f}{\rho^2} + \frac{f_0}{\rho_0^2} 
\right)
 
\cdot \frac{l}{ 2 \, d}
}
}


where

LaTeX Math Inline
body--uriencoded--\displaystyle j_m = \frac%7B \dot m %7D%7B A%7D

mass flux

LaTeX Math Inline
body--uriencoded--\displaystyle \dot m = \frac%7Bdm %7D%7B dt%7D

mass flowrate

LaTeX Math Inline
body--uriencoded--\displaystyle q_0 = \frac%7BdV_0%7D%7Bdt%7D = \frac%7B \dot m %7D%7B \rho_0%7D

Intake flowrate 

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

Intake fluid density 

LaTeX Math Inline
body\Delta z(l) = z(l)-z(0)

elevation drop along pipe trajectory

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

Darcy friction factor 

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

Reynolds number 

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)

...