Laminar nozzles can be purchased in many places.
http://www.atlanticfountains.com/laminar_primer.htm
I agree that 'coherent' is a more accurate definition but somehow the
'sales end' of the world like the word 'laminar' better. Perhaps it
makes more sales. Either way, the idea of straightening out the fluid
as it exits the propulsion device seems to make the fluid quieter as
it departs. It would be interesting to see if the same can be done
effectively on a hovercraft. My Henrob torch is evidence of this and
so is my radio controlled model Dynamax ducted fan unit.
http://www.jetmodelproducts.com/dynamax.htm
On Jun 6, 9:33=A0am, Ken Roberts <for...@[EMAIL PROTECTED]
> wrote:
>
> I think you're using the wrong word.
>
> Laminar flow describes air moving next to a surface, where you want
> the exit stream to all go the same direction, if I understand
> correctly.
>
> I think the word you're looking for is "coherent" flow. =A0Laser light
> is coherent.
>
> After talking to somebody about this who designs props, fans and
> ducts, I think this is not necessarily on the right track. =A0Or rather,
> what you're describing about coherency might help, but the main idea
> here is that static thrust improves not through making high velocity
> air, but moving large volumes of air. =A0The ideal thruster would move
> each particle only slightly and cause the dispersion pattern to couple
> very well to the surrounding atmosphere.
>
> IMO, the noise would drop because the exit velocity drops.
>
> So I think that the overall best approach would be in two steps: =A0Make
> props or fans which perform extremely well for the intended use, and
> reduce noise as much as possible in ways that do not detract from
> performance. =A0The second step would be to make ducts which aid in
> conditioning the air for the prop or fan, and which couple the exit
> air in the best way.
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