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RES: [compost_tea] Re: Pumping air in is not the best way to aerate your tea



Regardless the theoretical discussion about how a fluid can

go inside of a pipe I have changed the design of my machines

after learning from DR Elaine about this issue, from the original

90 deg angle to a 45 angle and have noticed improvement in all

aspects.

I can now use a smaller pump to do the same job I used to do before.

Brewing time have decreased and I notice less bio film formation on

the pipping.

 

 

Jose

 

 

I failed to respond last year when this was first posted, but I will now. I do not see how 90 degree bends in a fluid transfer systems would kill life. You have to look at the velocity  profile of water moving  in a pipe to realize that irregardless of the direction or route, you are going to have laminar flow. The greatest velocity would of course be in the center of the pipe, while do to the co-efficient of friction between the fluid and the pipe, the smallest velocity would be in the "boundary layer" next to the pipe wall. This boundary layer, to my way of thinking, would be the most destructive to the living organisms in the CT, due to friction. This would hold true in a 90, 45, or even a straight pipe. The fluid just doesn't shoot through the pipe and go splat on  the wall of a corrosponding elbow.
Bill Baranick

Frank L Teuton wrote:



The issue with water pumps and their associated plumbing is one of organism
survival. Impeller mechanisms and 90 degree turns in the plumbing can cause
organism kill, reports Dr Ingham.

 

 


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