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deployments.
In any way of utilizing calculator, Internet connection is required, for authentication at least.

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Available in download version

save/open multiple results

export to word and excel

print results

custom fluid properties

K factor for fittings, resistance coefficient

pipe surface roughness selection

select between gauge and absolute pressure

compressible isothermal flow

dry air isothermal flow

gas offtake flow

natural gas flow

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When is this calculator suitable?

You can use the calculator for all fluids and flow rates without any restriction.
The calculator applies to fluid mixtures also, but you have to enter the viscosity
of a mixture.

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Calculator description

Reynolds number named after Osborne Reynolds (1842 – 1912),
gives the relation between inertial and viscous forces of fluid flow.
If inertial forces (flow rate) are much bigger, and Reynolds number
is higher than critical, Re > 2320, fluid flow is turbulent,
and if viscous forces are big enough in comparison to inertial (flow rate),
Reynolds number is lower than critical, Re < 2320, fluid flow is laminar.

For calculation of Reynolds number in closed pipe fluid flow average velocity,
fluid viscosity, and internal pipe diameter should be known. Reynolds number is
proportional to fluid flow average velocity and pipe diameter and inversely
proportional to fluid viscosity.

With Reynolds number calculator you can analyze what makes fluid flow regime laminar
and what is needed to force the fluid to flow in the turbulent regime. For example -
in pipes with minimal internal diameter it is more likely to have laminar flow regime
with small Reynolds number even for a fluid with low viscosity. In fluid flow with
temperature change flow regime can change from turbulent to laminar flow regime,
as viscosity is changing depending on the fluid temperature.

# Need a helping hand?

If you need a quick calculation, but you are not still familiar how to use the calculator, you
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