closed circular pipe velocity

[cmul]

I'm having the hardest time with this problem, and I think that I'm just blind to something....it seems like it should be very simple.

Here goes....

Given: x-sect of circular pipe with d/D=.01

What is the velocity?

Could somebody please point me in a direction where I can begin to find an method for an answer to this?

Thanks

 

[Chucktown PE]

I'm having the hardest time with this problem, and I think that I'm just blind to something....it seems like it should be very simple.
Here goes....

Given: x-sect of circular pipe with d/D=.01

What is the velocity?

Could somebody please point me in a direction where I can begin to find an method for an answer to this?

Thanks

You need to look in Appendix 19.C of the CERM. There is a graph of circular channel ratios. If d/D = 0.1 (I think you mean 0.1 instead of 0.01) then v/vfull is approximately 0.3.

 

[EnvEngineer]

That will still only get you the flow area, you need a slope and friction factor or a flow rate Q to find the velocity.

 

[cmul]

That will still only get you the flow area, you need a slope and friction factor or a flow rate Q to find the velocity.

That's the thing, no slope is given. I assumed a pipe of 12", and utilized the chart in Appx.19., which gives me a vfull/v. I guess that I have to calc the v-full, and divide by the number obtained from the chart.

Thanks