I have an air flow going from a 4" pipe into a 2" pipe. I am convinced, =
but not positive that the air is swirling, like a whirl-pool, inside the =
4" pipe as it enters the 2" pipe. This is not desirable because it leads =
to false static pressure readings. I can imagine that it looks very much =
like water flowing out of a soda-pop bottle when turned upside down.

I have greatly reduced this effect with baffles, but, I would rather not =
use baffles.

Is there transition shapes that induce whirl-pool action. I currently =
have a trumpet like transition.=20

Oh, and I know nothing about fluid dynamics.

Thanks

John

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