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Dyson's 100,000 Gs ?

Dyson's 100,000 Gs ? - Physics Forum

Dyson's 100,000 Gs ? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 11-29-2004, 07:35 AM
Nehmo Sergheyev
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Default Dyson's 100,000 Gs ?



I'm skeptical about the claims of Dyson vacuum cleaners:
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or
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If I can summarize their illustration: They are claiming the G force
inside a rotating vortex of a gas increases when the radius of the
rotating gas decreases. They also claim to achieve 100,000 Gs.

They've got a comercial on TV that says the same thing.

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  #2  
Old 11-29-2004, 09:46 AM
Sylvia Else
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Default Dyson's 100,000 Gs ?



Nehmo Sergheyev wrote:

It does if the speed of the air doesn't change - the acceleration is
then inversely proportional to the radius.


Let's suppose that at any given time, there's 1 litre of air being
subject to this acceleration. That's about 1.25 grams. So the force on
the air is about 100,000 * 10 * 1.25 * 10^-3 Newtons, or 1250 N, which
is about the weight of a reasonably well built man.

Doesn't sound untenable.

Sylvia.

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  #3  
Old 11-29-2004, 01:53 PM
N:dlzc D:aol T:com \(dlzc\)
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Default Dyson's 100,000 Gs ?

Dear Sylvia Else:

"Sylvia Else" <[Only registered users see links. ].this.address> wrote in message
news:[Only registered users see links. ].this.address...

I'd expect that to occur only at key points in the flow path. If the
entire air mass were exposed to this for some length of time, acceleration
begets velocity:
- the plastic walls/structures would erode rapidly,
- the internal pressure in the highest speed portion of the cyclone should
be less than the available atmospheric pressure. And certainly lower than
can be achieved by a high volume, low delta-p, vacuum cleaner motor.

To the OP, I'd consider the claim to be accurate in fact, but not to
describe the entire air volume. I'd guess more like bringing a stream of
air to a dead stop at some point in the air flow path. Or noting that the
angular velocity is 100,000 higher (or more) than the Earth, so it must be
higher acceleration to keep the air on the path. (This last sentence is
sales-speak, please forgive me.)

David A. Smith


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  #4  
Old 11-29-2004, 04:56 PM
Uncle Al
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Default Dyson's 100,000 Gs ?

Nehmo Sergheyev wrote:

It is entirely reasonable that some volume of the cyclone stream hits
100K gees. Given the apparent dimensions of the thing that would be,
ah, maybe 8-10 atmospheres of pressure? Piddles. Now we wonder,
though the Dyson cannot clog, can it wear through from abrasion?

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  #5  
Old 11-30-2004, 01:47 PM
John T Lowry
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Default Dyson's 100,000 Gs ?


"Nehmo Sergheyev" <[Only registered users see links. ]> wrote in message
news:6c0b0da9.0411282335.175c07e5@posting.google.c om...


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  #6  
Old 11-30-2004, 01:48 PM
John T Lowry
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Default Dyson's 100,000 Gs ?


"Nehmo Sergheyev" <[Only registered users see links. ]> wrote in message
news:6c0b0da9.0411282335.175c07e5@posting.google.c om...

100,000 g's and not a single "Gee Whiz!"??

John Lowry
Flight Physics


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  #7  
Old 12-04-2004, 02:15 AM
operator jay
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Default Dyson's 100,000 Gs ?


"John T Lowry" <[Only registered users see links. ]> wrote in message
news:sS_qd.7724$[Only registered users see links. ].pas.earthl ink.net...

I got a job down at the Alpha-Bits factory, I'm making over 100 G's a year.

j



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