[b]Pipe Flow[/b]

[engcom]

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

 

[RWF7437]

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

May be found in any hydraulics reference.

good luck

 

[quark]

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)

 

[Ussuri]

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