Message text written by "Randall Young"
>As a thought experiment, think of a bunch of pipes bundled together and
you're squirting water at them with a hose. If the water hits the end of
the pipes squarely, then it doesn't spread much and you get maximum flow
through each of the pipes being hit. If you angle the water though, it
spreads out over more pipes, and there is less flow per pipe. But having
something deflect the water after it runs out of the pipes has little or no
effect.
<
To complete the experiment imagine a object blocking the exit of the tubes
such that
the water backs up the tube.
Having done some qualitative analysis of air flow and fans and coils etc.
putting a fan in
close proximity to the radiator will inhibit air flow. If it is behind the
radiator the pressure front
from the motor and blades will inhibit the airflow through the radiator.
Moving the fan away
from the radiator by a couple of inches will reduce the blockage at a
greater rate for a fan
behind the radiator and the optimum (or at least the point of diminising
returns) is at apporx one
diameter of the blocking object. If the fan is in front must be much
greater. More like 3 or 4
fan diameters.
So, from an airflow perspective behind the radiator and spaced back a few
inches is optimum.
This, however is not practical in most TR applications since there is an
engine there, there is a
steering rack there and there is a cross member there.
Also consider that a fan in front is working with cooler, denser air and
thus may be more
effective for that reason.
But no matter what you do, a fan in any location is better than no fan at
all.
Dave
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