Motivation
One of the key challenges in Pipe Flow Dynamics is to predict the pressure distribution along the pipe during the stationary fluid transport.
In many practical cases the stationary pressure distribution can be approximated by Isothermal or Quasi-isothermal homogenous fluid flow model.
Pipeline Flow Pressure Model is addressing this problem with account of the varying pipeline trajectory, gravity effects and fluid friction with pipeline walls.
Outputs
Inputs
T_0 | Intake temperature | T(l) | Along-pipe temperature profile |
p_0 | Intake pressure |
\rho(T, p) | |
q_0 | Intake flowrate |
\mu(T, p) | |
z(l) | Pipeline trajectory TVDss | A | Pipe cross-section area |
\theta (l) | Pipeline trajectory inclination, \displaystyle \cos \theta (l) = \frac{dz}{dl} | \epsilon | Inner pipe wall roughness |
Assumptions
Stationary flow | Homogenous flow | Isothermal or Quasi-isothermal conditions | Constant cross-section pipe area A along hole |
Equations
Pressure profile along the pipe | ||
---|---|---|
|
where
\displaystyle j_m = \frac{ \dot m }{ A} | mass flux |
\displaystyle \dot m = \frac{dm }{ dt} | mass flowrate |
\displaystyle q_0 = \frac{dV_0}{dt} = \frac{ \dot m }{ \rho_0} | Intake volumetric flowrate |
\rho_0 = \rho(T_0, p_0) | Intake fluid density |
\Delta z(l) = z(l)-z(0) | elevation drop along pipe trajectory |
f(T,p) = f({\rm Re}(T,p), \, \epsilon) | Darcy friction factor |
\displaystyle {\rm Re}(T,p) = \frac{u(l) \cdot d}{\nu(l)} = \frac{j_m \cdot d}{\mu(T,p)} | Reynolds number in Pipe Flow |
\mu(T,p) | dynamic viscosity as function of fluid temperature T and pressure p |
\displaystyle d = \sqrt{ \frac{4 A}{\pi}} | characteristic linear dimension of the pipe |
The equation (1) can also be written in the following form:
Pressure profile along the pipe | ||
---|---|---|
|
where
\Phi = \frac{1}{64} \cdot {\rm Re} \cdot f | Reduced Friction Factor |
See also
Physics / Fluid Dynamics / Pipe Flow Dynamics / Pipe Flow Simulation / Pressure Profile in Homogeneous Steady-State Pipe Flow @model
[ Darcy friction factor ] [ Darcy friction factor @model ] [ Reynolds number in Pipe Flow ]
[ Mass Rate in L-Proxy Pipe Flow @model ]
[ Homogenous Pipe Flow Temperature Profile @model ]