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[b]Pipe Flow[/b]

[b]Pipe Flow[/b]

[b]Pipe Flow[/b]

(OP)
What is the equation for determining the flow rate in a pipe that is not full.

RE: [b]Pipe Flow[/b]

The Manning Equation:
Q=(1.486/n)*A*R^2/3*S^0.5

May be found in any hydraulics reference.

good luck

RE: [b]Pipe Flow[/b]

You can use Darcy's as well by calculating the equivalent diameter where, D = 4A/P (A is area of flow and P is wetted perimeter)

RE: [b]Pipe Flow[/b]

Or another option is to use Colebrook-White equation and modify the pipe diameter using the Butler-Pinkerton shape correction factor.

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