# Pressure loss calculator, head loss in pipe

## Pressure drop calculation algorithm

Checking calculation results.

- Calculate values:
- Mean velocity of the fluid
- Reynolds number Re

^{3}/s, A - pipe's cross-sectional area, m

^{2}, A=πd

^{2}/4, d - pipe bore, m

^{2}/c, Rr - hydraulic radius, for round pipe R=d/4, d - diameter, m

Darcy friction factor formula may be applicable depends upon the type of flow that exists.

- The Darcy friction factor for laminar flow Re<2000 is given by the following formula:
- Which friction factor for transition between laminar and turbulent flow 2000<Re<4000 - is given by the following formula:
- The Darcy friction factor for turbulent flow Re>4000 is given by the following formula. к=Δ/d, Δ - absolute roughness coefficient.

### The head loss calculation

The head loss in a pipe, tube or duct can be calculated with the Darcy-Weisbach equation

### The pressure drop calculation

The pressure drop can be calculated with the Darcy-Weisbach equation.

^{3}, g - acceleration of gravity

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