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I need to model a pipe in modelica. Now modelica has its own fluid library where i can find a model of a pipe. But i need to model a pipe which has unequal inlet and outlet area. The outlet of the pipe is smaller than the inlet. Since mass going in the pipe=mass going out, hence the velocity of the fluid at the outlet should increase. I need a detail mathematical expression of this behavior. Please help me out.

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# Flow through a pipe

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