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Re: [PSUBS-MAILIST] Fluidic instruments and controls?

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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