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Nitrogen has some obvious advantage. I'm personally sticking with
electric for the foreseeable future. Just going to wait until smarter
people than me have the systems all figured out.
And now I'll quit designing "just one more
component" and say good night (CDT) to my fellow compulsives who
also stay up late.
Jim
In a message dated 6/8/2010 11:26:05 P.M. Central Daylight Time,
piolenc@archivale.com writes:
Thanks
for the response. I did notice the emphasis in the literature on
cleanliness of the air, for fluidic systems that use that gas. I also
noted that, as the volume of air used in computing elements is typically
small, the necessary level of cleanliness is usually easy to
provide.
Although most of the literature deals with air (sometimes
other fixed
gases) as the working fluid, I can't find any reason that
other fluids,
and particularly liquids, could not be used. Flow velocities
would be
smaller for a given Reynolds number, compressibility is not a
problem
and energy use should be smaller because you're pumping a
substantially
incompressible liquid.
Not arguing with you - just
explaining my interest.
Marc
On 6/9/2010 10:48 AM, Hugh Fulton
wrote:
> I was involved in some plastic moulders that used fluidic logic
elements and
> the air/gas has to be super clean and dry otherwise you
get build-up on the
> walls which gives all sorts of nasty
surprises.
> Oil free air is a must or a pure gas such as oxygen but
they work on the
> coanda effect. Air with oil in it results in
hydrocarbon build up on the
> walls. Also you need to have filters for
"noise" Very cool little things but
> a nightmare to fault-find.
Stick with electrics is my take. Hugh
>
>
>
-----Original Message-----
> From:
owner-personal_submersibles@psubs.org
>
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Marc de
Piolenc
> Sent: Wednesday, 9 June 2010 1:53 p.m.
> To: Personal
Submersibles
> Subject: [PSUBS-MAILIST] Fluidic instruments and
controls?
>
> Just a quick impulse question.
>
> I'm
currently spending a pleasant few hours downloading from Jens's
>
fileserver - what a treasure horde that is!
>
> While thus
blissfully occupied, it occurred to me to wonder whether
> anybody has
investigated fluidics for submarines. I'm not talking about
> pneumatics
and hydraulics, but rather instruments and controls that use
>
fluid-dynamic phenomena. For an introduction, see:
>
>
http://en.wikipedia.org/wiki/Fluidics
>
> Obviously the aim here
is to keep electronics, with their
> water-sensitive components, to a
minimum. Fluidics is roughly analogous
> to electronics in that there
are both analog and digital
> implementations. Interest in this field
recurs from time to time in
> connection with operation of devices that
have to be stored over long
> periods before use, and in connection with
high-radiation environments
> that can damage solid state electronic
devices. NASA even devised an
> all-fluidic guidance system for a
projected "lifeboat" for the space
> station, with a stored program that
could control the entire re-entry
> process! The control system used
oxygen flow from the life support
> reservoir.
>
>
Best,
> Marc
>
>
>
>
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