Flow Through a Pipe: Modelica Model with Unequal Inlet-Outlet Areas

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Discussion Overview

The discussion revolves around modeling fluid flow through a pipe with unequal inlet and outlet areas using Modelica. Participants explore the implications of mass conservation and fluid velocity changes due to differing cross-sectional areas, seeking a detailed mathematical expression for this behavior.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant requests a detailed mathematical expression for fluid behavior in a pipe with unequal inlet and outlet areas, emphasizing the relationship between mass flow rates and fluid velocity.
  • Another participant suggests considering Bernoulli's principle with additional loss terms to account for frictional and viscous effects, indicating a potential approach to the problem.
  • A third participant provides a link to an external resource for further assistance on pipe flow, indicating a desire for additional support.

Areas of Agreement / Disagreement

There is no consensus on the specific mathematical approach to model the fluid behavior, and multiple viewpoints regarding the application of Bernoulli's principle and external resources are presented.

Contextual Notes

Participants have not fully defined the assumptions or parameters necessary for the mathematical modeling, and the discussion lacks detailed exploration of the implications of frictional and viscous effects.

polezero
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Hello guys,

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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Bernoulli with loss terms included for frictional/viscous effects? Seems pretty cut and dry.
 
you can ask for a help in http://waterdesign.tk/ you ask them about pipes. they can help you
 
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