Friction loss k value

[eddtan]

Hello Guys,

I have a submerged channel with several openings in between. Would like to check if I can calculate the loss through the openings using k-value=2.6 of submerged orifice. So for the example shown below, the loss would be n*k*(v^2)/(2g) = 3*2.6*(v^2)/(2g).

What are your thoughts?

Appreciate your comment!

Thank you.

 

[cvg]

not sure what you are attempting, but it sounds like a sharp edged orifice, which may or may not be submerged. suggest the following which may help clarify

https://www.engineeringcivil.com/flow-through-orifices.html

 

[saikee119]

I am of the opinion that the approach by the OP is valid but could not comment on the k value. I would support the three submerged orifices likely to have similar k values and the whole can have one consolidated K coefficient.

I would just pour water through the system, keep two reservoirs at constant head, measure the orifice diamter, flow rate, head loss and compute the k coefficient.

In a steady state the head difference should equal to the K coefficient x velocity head (through the orifice).

 

[bimr]

Another example:

example

Take C[sub]D[/sub] to be approximately 0.64.

 

[johnie134]

cd=60-65%