Calculate the volumetric flow of a fluid

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SUMMARY

The discussion focuses on calculating the volumetric flow of a fluid driven by the weight of a piston in a cylinder. The participants reference the Hagen-Poiseuille equation for laminar flow and discuss the continuity and momentum equations relevant to fluid dynamics. Specific equations for both duct flow and circular pipe flow are provided, highlighting the importance of pressure gradients and viscosity in determining flow rates. The conversation emphasizes the application of fundamental fluid mechanics principles to solve practical engineering problems.

PREREQUISITES
  • Understanding of fluid dynamics principles, particularly the Hagen-Poiseuille equation.
  • Familiarity with continuity and momentum equations in fluid mechanics.
  • Knowledge of pressure gradients and their effects on fluid flow.
  • Basic concepts of viscosity and its role in flow resistance.
NEXT STEPS
  • Study the derivation and applications of the Hagen-Poiseuille equation in various fluid systems.
  • Learn about the Navier-Stokes equations for more complex fluid flow scenarios.
  • Explore computational fluid dynamics (CFD) tools for simulating fluid flow in different geometries.
  • Investigate the effects of varying viscosity on flow rates in both laminar and turbulent conditions.
USEFUL FOR

Engineers, physicists, and students in mechanical or civil engineering who are involved in fluid mechanics and need to calculate flow rates in systems influenced by external forces such as pistons.

CFXMSC
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How could I calculate the volumetric flow of a fluid due to the weight of a piston in a cylinder?

At first moment i I thought the Hagen-Poiseuille equation, but I'm not sure. Any suggestions?
 
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For Duct

Continuity:

\frac{\partial v}{\partial y}=0

Momentum:

\rho g_y-\frac{\partial p}{\partial y}+\mu\left(\frac{\partial^2v}{\partial x^2}+\frac{\partial^2v}{\partial y^2}\right)=0

For Circular Pipe:

Continuity:

\frac{\partial}{\partial r}(v_z)=0

Momentum:

g-\frac{1}{\rho}\frac{\partial p}{\partial z}+\nu\left[\frac{1}{r}\frac{\partial}{\partial r}\left(r\frac{\partial v_z}{\partial r}\right) \right]=0
 
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