----- Original Message -----
From: "Jim Monteith" <jimm@SERVICEMATE.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, November 21, 2003 8:10 AM
Subject: Re: [OT ] Fluid dynamics question


> Is there anyway you can put something in the flow path and watch it to see
> what the air is doing?
>
>
> Jim

Yes, I have taped threads on the sides (using clear 4" tubing) and they
indicate sideways motion near the transition. There is not a lot of air in
the 4" pipe. The 4" section is more of a collector. The air is being drawn
from the 2" section (lower pressure in the 2" than in the 4").

Thanks
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of John Pearson
> Sent: Friday, November 21, 2003 09:34
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [OT:] Fluid dynamics question
>
>
> 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.
>
> Oh, and I know nothing about fluid dynamics.
>
> Thanks
>
> John
>
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