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Pipe Wall Shear Stress Calculator — Darcy Friction Factor
Calculate pipe wall shear stress and pressure gradient from Darcy friction factor, density, mean velocity and diameter.
Last updated: September 17, 2026
Results
Use non-negative Darcy f/velocity and positive density/diameter
Formula, example and assumptions
τw=fρv²/8; ΔP/L=4τw/D.
For f=0.02, water at 2 m/s in a 0.1 m pipe gives τw≈10 Pa and pressure gradient≈400 Pa/m.
- f is the Darcy friction factor, not the Fanning factor.
- Steady fully developed internal flow is assumed.
Frequently asked questions
What does this Pipe Wall Shear Stress Calculator solve?
Calculate pipe wall shear stress and pressure gradient from Darcy friction factor, density, mean velocity and diameter.
Which units should I use?
Use the SI units shown beside each input. The results also expose practical converted outputs where useful.
Can I use this for final equipment selection?
Use it for transparent engineering estimates and cross-checks. Confirm fluid properties, manufacturer curves and applicable design codes before final selection.