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@wikipedia


Stationary fluid Fluid flow with fluid staying at quasistatic equilibrium and fluid pressure and temperature are  with fluid pressure 

LaTeX Math Inline
bodyp(t, {\bf r})
 is not changing in time:

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anchorp
alignmentleft
p(t, {\bf r}) = p({\bf r})

This immediately leads to stationary fluid velocity 

LaTeX Math Inline
body{\bf u}(t, {\bf r})

LaTeX Math Block
anchoru
alignmentleft
{\bf u}(t, {\bf r}) = {\bf u}({\bf r})



Expand
titleDerivation


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In the most general case (both reservoir and pipelines) the fluid velocity is a function of pressure and pressure gradient and can be written as:

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anchor1
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{\bf u}(t, {\bf r})= F({\bf r}, p, \nabla p)

with right side not dependent on time in stationary flow:

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anchor1
alignmentleft
T
\frac{\partial {\bf u}(t, {\bf r})}{\partial t}= 0

which leads to

LaTeX Math Block Reference
anchoru
.



The fluid temperature 

LaTeX Math Inline
bodyT(t, {\bf

...

r})
 is supposed to vary slowly enough to provide quasistatic equilibrium.


This flow regime is often observed in pipeline fluid flows and in pipeline fluid flow and reservoir fluid flows flows.

See also

...

Physics / Fluid Dynamics 

Steady State Well Flow Regime (SS) ]