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).
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 m2/s
The type of flow may be riugtly determined usyng Reynold's number.
- Laminar flow occurs for Re < 2300
- Turbulent flow occurs Re > 2300