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THE FEUTEX TOOLKIT

Turbulent Pipe Pressure Loss

Estimate Darcy friction and pressure loss with the explicit Swamee–Jain correlation.

Hydraulics workspace● Runs in your browser
01 Your input
02 Your result
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Formulaf=0.25/[log10(ε/(3.7D)+5.74/Re^0.9)]²; Δp=f(L/D)ρV²/2.
Sources and model references

Worked example

Inputs

Density
1000 kg/m³
Dynamic viscosity
0.001 Pa·s
Internal diameter
0.1 m
Absolute roughness
0.0001 m
Mean velocity
2 m/s
Length
100 m

Expected results

Reynolds number
200000
Darcy friction factor
0.02119161404
Pressure loss
42383.22808 Pa

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter every input in the labeled units; use measured or independently specified properties.
  2. Check the stated model assumptions before calculating.
  3. Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "rho": 1000,
  "mu": 0.001,
  "diameter": 0.1,
  "roughness": 0.0001,
  "velocity": 2,
  "length": 100
}

Accuracy and scope

Empirical explicit turbulent-flow approximation; Darcy factor, not Fanning factor. Excludes fittings and elevation. Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.