What is the Darcy-Weisbach equation?

h_f = f × (L/D) × (V²/2g), where f is the Darcy friction factor, L is pipe length (m), D is diameter (m), V is velocity (m/s), and g is gravitational acceleration (9.81 m/s²). The friction factor is obtained from the Moody diagram.

How is the friction factor determined?

For laminar flow (Re < 2300), f = 64/Re. For turbulent flow, use the Colebrook-White equation or Moody chart, which depends on Reynolds number and relative pipe roughness (ε/D).

Darcy-Weisbach Pipe Head Loss Calculator

Compute head loss due to friction in pipes using the Darcy-Weisbach equation and Moody chart friction factor.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How It Works

Compute head loss due to friction in pipes using the Darcy-Weisbach equation and Moody chart friction factor

Each component has a specific meaning:

Darcy-Weisbach equation — The darcy-weisbach equation recorded for the patient or scenario being assessed.
Moody chart friction factor — The moody chart friction factor recorded for the patient or scenario being assessed.

Note: Interpret the darcy-weisbach head loss result against the clinical thresholds and context described above.

How to Use

Enter the Darcy-Weisbach equation, Moody chart friction factor for the patient or scenario you are assessing. Compute head loss due to friction in pipes using the Darcy-Weisbach equation and Moody chart friction factor. Use the darcy-weisbach head loss result to inform your clinical assessment.

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