Water flows through a horizontal 60-mm-diameter galvanized iron pipe at a rate of 0.017 m3/s. If the pressure drop is 135 kPa per 10 m of pipe, determine the friction factor.

The friction factor of a 60-mm-diameter galvanized iron pipe is 0.045.

Explanation:

Losses due to friction flowing through iron pipe is determined by the Darcy-Weisbach model:

Where:

- Pressure drop, measured in pascals.

- Density of water, measured in kilograms per cubic meter.

- Friction factor, dimensionless.

- Length of the pipe, measured in meters.

- Diameter of the pipe, measured in meters.

- Velocity of the flow, measured in meters per second.

The friction factor is now cleared:

The flow velocity is equal to the volume flow divided by the cross area of the iron pipe. That is:

Given that and , the velocity of the flow is:

Now, if , and . The friction factor is:

The friction factor of a 60-mm-diameter galvanized iron pipe is 0.045.

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