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Reynolds number

A regime screen, not a friction-factor lookup.

Density (kg/m³)

Velocity (m/s)

Diameter (m)

Dynamic viscosity (Pa·s)

CalculateReset

Method

Re = ρvD/μ. Worked case: water, 1.13 m/s, 150 mm, 0.001 Pa·s is about 169,500.

Logic: how this figure is built.

Last checked 2 October 2026. See the common-calculations note and the disclaimer.