% Verbal description for system Pipe (Pipe_desc.tex)
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% %% Revision 1.1 1998/03/09 10:13:27 peterg
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The acausal bond graph of system \textbf{Pipe} is
displayed in Figure \Ref{Pipe_abg} and its label
file is listed in Section \Ref{sec:Pipe_lbl}.
The subsystems are listed in Section \Ref{sec:Pipe_sub}.
The \textbf{Pipe} component represents one way flow of incompressible
fluid though a pipe. Externally, it has true energy bonds: $P$/$\dot V$
(Pressure/volume-flow) representing hydraulic energy and $T$/$\dot
S$(Temperature/Entropy-flow) representing convected thermal energy.
Internally, however, the thermal part is represented by a pseudo bond
graph which computes the flow of internal energy $\dot E$ from the
upstream temperature $T_1$ and the volumetric flow rate $\dot V$ as:
\begin{equation}
\dot E = \rho c_p T_1 \dot V
\end{equation}
The $AF$ component makes the $FMR$ component use $T_1$ rather than
$T_1-T_2$.
The two \textbf{ES} components provide the conversion from true to
psuedo thermal bonds and vice versa.
The pipe has an resistance to flow represented by the \textbf{RS}
component labeled `r' which can be linear or nonlinear. The hydraulic
energy loss reappears on the thermal bond of this (energy-conserving)
\textbf{RS} component.
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