Re: [PSUBS-MAILIST] Dyson's Bladeless Fan

["Alan James" <alanjames@xtra.co.nz>]

OK Mar,
I'll place a fish net behind the fan & have a burley dispenser.
If I remember rightly you've written a book on ducted fans.
Is the claimed efficiently purely due to the ducting as in a kort nozzle?
Alan


----- Original Message ----- 
From: "Marc de Piolenc" <piolenc@archivale.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, April 05, 2012 4:04 PM
Subject: Re: [PSUBS-MAILIST] Dyson's Bladeless Fan


> I'm not sure that eliminating exposed blades makes much difference to 
> sea life. In hydroelectric power, much study has been given to the 
> effects of turbines upon fish, and it was learned that fish kills by 
> turbines are the result, not of blade impact, but of pressure gradients. 
> An ejector like the Dyson "fan" has wicked gradients, so a fish 
> aspirated by it might well emerge apparently intact, but dead just the same.
>
> Marc
>
> On 4/5/2012 11:48 AM, irox wrote:
> > Note, the "bladeless" fan does in fact have blades, but they
> > are tucked away in the base.  It is effectively sucking air
> > into the base and pushing it along channels/tubs to be output
> > around the trim of the ring.
> >
> > Maybe it has some use for underwater vehicles, such as an
> > environmentally sensitive area (no exposed blades to hit
> > sea creatures).  But as Marc points out, it would come with
> > an efficient hit.
> >
> > Cheers,
> >   Ian.
> --
> Archivale catalog: http://www.archivale.com/catalog
> Polymath weblog: http://www.archivale.com/weblog
> Translations (ProZ profile): http://www.proz.com/profile/639380
> Translations (BeWords profile): http://www.bewords.com/Marc-dePiolenc
> Ducted fans: http://massflow.archivale.com/
>
>
>
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