From: Jose Luiz M Garcia (gingerjo@terra.com.br)
Date: Sun Feb 23 2003 - 22:24:43 EST
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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