3 replies to this topic

[ahmadijaz65]

Hi

 

I am trying to solve a parallel piping system (sizing problem). I need to find the diameter of each branch pipe. I am using a Darcy Head Loss Equation for Iterative solution. I have flowrate, Length, viscosity and density. I will guess the friction factor and continue my iteration but problem is i am not provided with the head loss (hf).

 

please tell me how can i calculate the head loss (hf) value. Problem sketch and statement is also attached.

 

Thanks in Advance !

Attached Files

•  Sketch.jpg   17.52KB   3 downloads
•  Problem.jpg   41.91KB   1 downloads

[Bobby Strain]

You should think how to do this, do some work, and show it to us. But not in Excel gibberish. I would start with what you know, and see how this relates to the problem. The key lies in the fact that the flow is laminar, so the friction factor is a simple function of the Reynolds number. This is where I would start.

 

Bobby

[breizh]

Hi,

Consider this file to help you .

Good luck

 

Breizh

[Nikolay_]

Hello Ahmad,

Calculate head loss in the main pipe up to 2^nd, 4^th, 6^th, 8^th branches. Last, you can define diameters of branches under the hypothesis that head loss from discharge of pump to the end of each branch is equal (add early calculated head losses in the main pipe to head loss of branches). I didn’t see pressure at the end points of branches, so I think you can take 20 ft centers to define gage pressure of pump.

 

Nikolai