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# what is the reynolds number?

## what is the reynolds number?

(OP)
Water at 70 F is flowing at the rate of 5 gal/min through a 2-inch diameter tube. The viscosity at this temperature is 0.98 cP. What is the value of the Reynolds number? Thank you.

### RE: what is the reynolds number?

You should be able to work out from the equation below.

The Reynolds number is defined as:

where:

ρ is the density of the fluid (SI units: kg/m3)
u is the flow speed (m/s)
L is a characteristic linear dimension (m)
μ is the dynamic viscosity of the fluid (Pa·s or N·s/m2 or kg/(m·s))
ν is the kinematic viscosity of the fluid (m2/s).

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