Sparger /manifold design

[Weaverofduart]

Ive spent days looking for the answers on the internet myself. Ive talked to engineers I know, ive learnt heaps and read more but Im still struggling to get my head around friction losses in manifolds and spargers.

I need a number of spargers (4) in a tank to creat a rotational velocity. Tank velocity is proportional to jet velocity, flow and number of jets created by the holes.in the sparger pipe.

My problem begins when trying to calculate the friction loss created by the spargers and the manifold that delivers the flow evenly to the spargers. Of course I need to know this so that I can make an appropriate pump choice.

Ive probably got the information I need but im being a bit thick.when im trying to make use of it.

Hope someone can help.

 

[GWJPE]

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 assuming constant diameter of pipe. It is an iterative process. If this is helpful perhaps we can continue this dialogue.

 

[Weaverofduart]

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.

 

[Compositepro]

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.

 

[Weaverofduart]

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

 

[Compositepro]

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.

 

[Weaverofduart]

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

 

[Chatiking]

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????