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Darcy-Weisbach formula for head loss in water

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 determining the friction factor.

There are 5 calculation possibilities:

  1. Calculate head loss
  2. Calculate diameter
  3. Calculate pipe length
  4. Calculate equivalent roughness
  5. Calculate flow rate

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Input and Output Parameters

Input Data

Parameter
Standard Units
Description
Flow
m³/s
Water volumetric flow rate
Temperature
°C
Water temperature
Diameter
m
Internal pipe diameter
Length
m
Pipe length
Equivalent roughness
mm
Pipe surface roughness
Roughness multiplier
-
Adjustment factor for roughness

Output Data

Parameter
Standard Units
Description
Head loss
m
Total head loss
Diameter
mm
Calculated internal pipe diameter
Length
m
Required pipe length
Equivalent roughness
mm
Calculated surface roughness
Flow
m³/s
Calculated water flow rate

References

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