Perda de carga em água pela fórmula universal (Darcy-Weisbach)
Calculate head
Calculate diameter
Calculate length
Calculate roughness
Calculate flow

Input data

Flow

Temperature

Diameter

Length

Equivalent roughness

Roughness multiplier

Output data

Head loss

Description

Calculate the head loss in water flowing through pipes using the Darcy-Weisbach formula and the Churchill correlation for the friction factor calculation.

 

There are five calculation possibilities:

  • Find the head loss
  • Find the diameter
  • Find the length
  • Find the internal roughness of the pipe
  • Find the flow

 

Darcy

SurfaceAbsolute Roughness Coefficient kk (mm)
Drawn Copper, Lead, Brass, Aluminum (new) and the like0.001 - 0.002
PVC, PE and other smooth Plastic Pipes0.0015 - 0.007
Stainless steel, bead blasted0.001 - 0.006
Stainless steel, turned0.0004 - 0.006
Stainless steel, electron-polished0.0001 - 0.0008
Commercial steel or wrought iron0.045 - 0.09
Stretched steel0.015
Weld steel0.045
Galvanized steel0.15
Rusted steel (corrosion)0.15 - 4
New cast iron0.25 - 0.8
Worn cast iron0.8 - 1.5
Rusty cast iron1.5 - 2.5
Sheet or asphalted cast iron0.01 - 0.015
Smoothed cement0.3
Ordinary concrete0.3 - 1
Coarse concrete0.3 - 5
Wood stove0.18 - 0.9
Well planed wood0.18 - 0.9
Ordinary wood5

Source: Extracted from https://www.engineeringtoolbox.com/surface-roughness-ventilation-ducts-d_209.html. Last seen on 08/29/2023

References

  • CHURCHILL, Stuart W. (1977). Friction-factor equation spans all fluid-flow regimes. Chemical engineering, Nov.