Bob Darrah wrote:

Paul said (big snip)

With my first test rig (Dec 99) when I used the furnace >>blower a wall at

the

end of the duct would cause the air to stack up down >>there.

With a straight V, (which is what it looks like you are using) right now I
am getting more air through the point of the V area than any where else.  It
decreases in a near straight line ratio as you move to the wide part of the
V.

I don't explain it, I just observe it.

Bob Darrah

)

That is exactly what I found when I did the furnace blower test.
I thought you knew that. The simple wedge was a suggestion of mine
for you to try with a 5 degree rad. Obviously the same principle
applies to the 5 degree rad as it does to the 30 degree rad that
I am using. You must use a curve.

I also think Tracy Crook found the same thing with his oil cooler
as he has some porous foam stuffed in there to equalize the flow.
I am not using a straight V. I am using a curve as in (b) on these 
gifs and as in this photo. 

The current test duct comes to a very sharp point. I think I over 
did it. I'll change it today.

Paul Lamar
 
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