Re: [Phys-l] air pressure question

[William Robertson <wrobert9@ix.netcom.com>]

Okay, I read the article. It's very good, but still not clear on why  
the air flow occurs. He does mention "centrifugal pumping" at the  
beginning, which would seem to confirm my explanation, but then later  
talks about Bernoulli in a vague way. I find it interesting that he  
got it to sing while holding one end out of a car window. That would  
seem to go against the centrifugal force explanation. But then we're  
back to using Bernoulli to explain pressure differences due to moving  
air and still air that are not connected in a continuous flow. Is it  
possible that when it's held outside a car window, you are simply  
setting up standing waves in the tube, much like blowing over the top  
of a beer bottle?

So, I remain with questions. As for "floogle," I bought several of  
these a number of years ago, and they were stamped with that name.

Bill




On Jan 26, 2011, at 3:12 PM, John Mallinckrodt wrote:

> On Jan 26, 2011, at 1:35 PM, William Robertson wrote:
>
> > Still doesn't answer my question about the Floogle, as it's called in
> > some places.
>
> I don't think I've ever heard it called a "floogle" and I can't find  
> any references to that on the web.  Apparently you didn't like Frank  
> Crawford's 1974 AJP paper that I referred to a couple of days ago.   
> It is considered definitive on the topic of singing corrugated pipes  
> in many quarters.
>
> John Mallinckrodt
> Cal Poly Pomona
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