Date: Mon Oct 19 16:53:42 2009

Author: Paul Nord

Subject: Re: bladeless fan

Post:

It's not exactly "bladeless". It looks like there's a fan in the base
of the thing which forces air out a groove along the edge of the
airfoil. The air then follows the contour and more air around the
circle becomes entrained. I think that their "amplification" of the
air means that 15x more air goes through the big ring than is sucked
in through the base. That's plausible if not efficient. My bets
would be on not.

If you could pulse this thing it might be an efficient way to spread
vortexes of warm/cool air around the room. It would be making a
constant stream of smoke rings. The vortexes actually propagate with
pretty low friction.

It looks cool anyway. More form than function would be my guess.

Paul


On Oct 19, 2009, at 2:16 PM, Anthony Lapinski wrote:

> A student sent me these links about a bladeless fan that works via
> Bernoulli's principle. Interesting!
>
> http://dvice.com/archives/2009/10/dyson-attacks-y.php
>
> http://www.dyson.com/fans/default.asp
>


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