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I'm not sure how well they'd work, but Panasonic makes some pretty quiet fans that put out around 80cfm or more through a 4" pipe.
- Len
>>> On 5/28/2009 at 8:59 AM, in message
<[log in to unmask]>, Tom Nielsen <[log in to unmask]>
wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related
> institutions.
> ****************************************************************************
> *
>
> Erich,
>
> I have found most versions of "Bernoulli Blower" -- even the
> Exploratorium's, when it's placed in a smaller space -- to be too loud
> for my taste. ( I suppose in truth the "modern world" is too loud for
> my taste, but what's to be done?) There is a direct tradeoff between
> the CPM and the noise, but other factors are important too. The path
> the air takes as it leaves the blower, and the aperture where it exits
> create resonances that shape the character of the sound. We had a
> quite powerful squirrel cage blower in San Jose, driven by a 230 volt
> 3 phase induction motor. Someone discovered (or was brilliant enough
> to know) that placing a tennis ball at the aperture magically lowered
> the noise while only slightly reducing the height at which the ball
> flies. The blower was also housed in a box lined with acoustic foam,
> fitted with air filters on the intake to avoid sucking in strings and
> such and a grill on the outlet to keep coins etc from being dropped in.
>
> My preference, to avoid all that bother, is to forgo the heavier
> balls usually used, and go with balloons and a small quiet ventilating
> fan. Yes, you will need to replace the balloons constantly, but
> then, beach balls don't last very long either -- and anything more
> durable takes considerably more air to lift.
>
> Lastly, for all that it has been replicated over the years, I don't
> think the "Bernoulli Blowers" is a particularly rich exhibit, compared
> to the "air play table" you also mention. The latter doesn't really
> need much air to be effective. Here, for example, is a wonderful
> alternative, also from the Exploratorium, that uses just a window fan:
>
> http://www.exploratorium.edu/pie/library/windtubes/index.html
>
> quietly,
>
> Tom Nielsen
> www.TheExhibitGuys.com
>
> On May 28, 2009, at 7:17 AM, Erich Rose wrote:
>
>> ISEN-ASTC-L is a service of the Association of Science-Technology
>> Centers
>> Incorporated, a worldwide network of science museums and related
>> institutions.
>>
> *****************************************************************************
>>
>> For an "air play table" or a Bernoulli blower what would you suggest
>> as a minimum air flow? CFM? I have used different fans in the past
>> with different results. More often than not they were used squirrel
>> cage fans that we had laying around and had a wide variety of
>> outputs. What I am looking for is some feedback from others about
>> what they found worked best.
>>
>> --
>> Erich Rose
>> Exhibit, Environmental and Industrial Design
>> 807 The Living End
>> Austin, TX 78746
>> 512-626-9930; [log in to unmask]
>>
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