Stu,
I sincerely doubt turbulent flow conditions exist, only "mixing". While there
is
a laminar flow layer, the entire tube's profile is very narrow, and long in the
air flow direction. This aspect ratio, and small cross section, allow plenty of
heat to be transferred to the air stream. You need a fluid mechanics expert,
with
a little heat transfer knowledge, not an ME, for this one. We are dealing with
a
liquid here, not a gas. I personally think it's a sales gimmick. Give me lots
of
well brazed fins/inch and three/four rows of stagger spaced tubes that are long
in
the air-flow direction, and narrow across.
That, I know, works.
Regards,
Steve
--
Steve Laifman < Find out what is most >
B9472289 < important in your life >
< and don't let it get away!>
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