Hello:  This may be a stretch, but look up some research information from the University of Wisconsin regarding the design of pressurized distribution systems for septic systems. It may not answer your question quantitatively, but some of the principles may be helpful.

Frankly i struggle with this a little too.  You almost need to develop a spreadsheet that calculates the head loss in the pipe between the orifices.  Remember that at each orifice you lose a portion of the total flow so that between orifices the loss of flow at orifice (n-1)should correspond to a reduction in velocity in the pipe on the way to orifice (n) assuming constant diameter of pipe. It is an iterative process.  If this is helpful perhaps we can continue this dialogue.  

The pdf that I have found is "Perrys chemical engineers handbook. Fluid and particle dynamics"

Has a section on spargers but im still not sure how to calculate the losses from branching of pipes.

A sparger bubbles gas through a liquid. It would not be effective for creating rotation in a tank. Describe what you want to accomplish and why.

Isnt the same term used for a pipe with holes in it to distribute water in jets?

If not its a pipe with holes init with the jets from the holes pointing along the side of the tank. The impulse of the jets interacting on the water  in the tank gets the water turning

To get the liquid in a tank rotating you only need one inlet jet entering tangentially at the outermost diameter. You want to maximize velocity. More jets or different locations will not improve anything. Momentum (linear and angular) is conserved. This is one of the basic principles of physics which applies to this case.

Really even in large tanks 5.5m diameters? Cant have the jet velocity to high or the fish could get injured by the jet.

I have a question:
I would like to know, how can I measure the  case  hardeness during the drying process of a root ( medicinal plant),  which  device  shall I used to  do it????