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Let's start with Pressure Profile in Homogeneous Steady-State Pipe Flow @model:
(1) |
\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(p) |
| |
(3) |
u(l) = \frac{j_m}{\rho(l)} |
| |
and assume constant pipe inclination:
(5) |
\theta(l) = \theta = \rm const |
Let's define constant number:
(6) |
G = g \cdot \cos \theta = \rm const |
and rewrite the equation
(1) as:
(7) |
\frac{\left[\rho(p) - j_m^2 \cdot c(p) \right] \, dp}{\rho^2(p) \, G - \frac{ j_m^2 }{2 d} \cdot f(p)} = dl
|
The integration of the left side of
(7) leads to:
(8) |
L = \int_{\rho_0}^{\rho} \frac{1/c- j_m^2 / \rho}{G \, \rho^2 - F} \, d \rho
=\int_{\rho_0}^{\rho} \frac{\rho \, dp}{G \, \rho^2 - F} -\frac{j_m^2}{2} \, \ln \frac{F/\rho^2 - G}{ F/\rho_0^2-G} |
where
\displaystyle F = \frac{ j_m^2 }{2 d} \cdot f(p) |
See also
Physics / Fluid Dynamics / Pipe Flow Dynamics / Pipe Flow Simulation / Pressure Profile in Homogeneous Steady-State Pipe Flow @model / Pressure Profile in G-Proxy Pipe Flow @model