- #1

tomwilliam

- 145

- 2

## Homework Statement

Estimate a reynolds number for a pipe of 0.3m internal diameter, carrying water at a rate of 71 m/s, and say what that says about the likely nature of the flow.

## Homework Equations

Re = (density x L x velocity of flow)/coefficient of dynamic viscosity for water

Viscosity of water = 8.9 x 10^-4 kg/m s

density of water = 1000 kg/m^3

## The Attempt at a Solution

Well, I have produced a result of some 27 million, which seems excessive to me. Possible mistakes: I used the diameter of the pipe as L. Also, the flow speed is something I calculated in a previous question, so could potentially be wrong. The speed is just due to potential energy coming from a reservoir exactly 500m higher up, where pressure is atmospheric only.

Does anything sound wrong with this solution? I have no reference for typical reynolds numbers in these situations...

Thanks in advance