# Reynolds number calculator

The Reynolds number is a criterion for the hydrodynamic similarity of a viscous fluid, it reflects the ratio of inertial forces to viscous friction forces.

## Calculation of Reynolds number for fluid flow in a round pipe

Enter the flow rate, pipe diameter and kinematic viscosity of the substance (or choose one of the proposed liquids).

### Initial data

## Reynolds number

The Reynolds number is defined as:

- whereby V - velocity of flow in m/s
- D - hydraulic diameter in meters, with circular cross-sections equal to the pipe internal diameter, and otherwise calculated ad D = 4*A/U
- A - cross sectional area
- U - circumference
- ν - kinematic viscosity in m
^{2}/s

The type of flow may be riugtly determined usyng Reynold's number.

- Laminar flow occurs for Re < 2300
- Turbulent flow occurs Re > 2300

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