The Poiseuille's Velocity of Compressible Fluids calculator compute the velocity based on the inner radius and length of a pipe, the viscosity of the fluid and the input and output pressure.
INSTRUCTIONS: Choose units and enter the following:
Fluid Velocity (v): The calculator returns the velocity in cm/s. However this can be automatically converted to compatible units via the pull-down men.
The assumptions of the equation are that the fluid is incompressible and Newtonian; the flow is laminar through a pipe of constant circular cross-section that is substantially longer than its diameter; and there is no acceleration of fluid in the pipe. For velocities and pipe diameters above a threshold, actual fluid flow is not laminar but turbulent, leading to larger pressure drops than calculated by the Hagen–Poiseuille equation.
The velocity equation for Poiseuile's Law is:
`v = r^2/(16·μ·L) · ( (P1^2 - P2^2)/(P1) )`
where:
References
The definition and formula for Poiseuille's equation for the compressible fluids was taken from Wikipedia (https://en.wikipedia.org/wiki/Hagen%E2%80%93Poiseuille_equation).