ClarityHow to use this tool
- Enter pressure difference, tube internal radius, tube length, dynamic viscosity.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
The method, explained
Volume flow Q = π ΔP r⁴/(8μL).
Using pressure difference = 100 Pa, tube internal radius = 1 mm, tube length = 1 m, dynamic viscosity = 0.001 Pa·s, the result is 3.92699082e-8 m³/s. Change these example inputs to match your task; use the method above to check each step.
Understanding your result
Hagen–Poiseuille model: fully developed, laminar, Newtonian, incompressible flow in a rigid round tube. Check Reynolds number separately.
What to keep in mind
Hagen–Poiseuille model: fully developed, laminar, Newtonian, incompressible flow in a rigid round tube. Check Reynolds number separately. An idealized educational model using the stated SI units. Real systems may need additional forces, losses or experimental measurements. Not a safety or equipment specification.
Common questions
How do I use this laminar pipe flow calculator?
Calculate ideal laminar volumetric flow through a circular tube from pressure difference. Enter pressure difference in Pa, tube internal radius in mm, tube length in m, dynamic viscosity in Pa·s. The starting example is editable; use values for the same system or project.
Which assumptions affect this result?
Hagen–Poiseuille model: fully developed, laminar, Newtonian, incompressible flow in a rigid round tube. Check Reynolds number separately.
Methodology maintained by ClarityKit. How these tools are built and checked.