Flow by gravity in a not full pipe

[babooman]

Dear all,

I need to perform a calculation of the flow by gravity in a not full pipe. I used in the past Manning equation for that purpose with water pipes, but this time the fluid is diesel oil. I am not sure of the correction to be done in Manning equation, since I guess that diesel viscosity must have some impact.

I appreciate any help. I'm trying to find some reference or alternative equation without success so far.

Thanks in advance.

 

[BigInch]

But it would not do that, if the exit was fully submerged.

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