> Briefly, take a long pipe and block it at about the midpoint with a wall.
> Make a small central hole in the wall. Introduce air tangentially into the
> pipe next to the mid point wall. Throttle the air flow out of the side that
> the air is introduced into so that SOME of the air will tend to flow through
> the hole and out the other open pipe end. (Actually slightly more complex
> than this in practice but not very much so).
>
> The air coming out the throttled end is noticeably hotter (up to around 100
> kelvins hotter). The air coming out the end which is fed via the central
> hole is noticeably cooler - up to about 50 kelvins typically depending on
> hot/cold split. Several somewhat incompatible theories explain this device
> rather well.
>
> Unlike Graham's device above, this one does need a net energy input. And,
> no, it cant be used regeneratively to give successively lower temperatures
> (unfortunately).
>
> RM
There are comercial & industrial products available based on that
system. I use to receive literature from them. A small cilinder (5
inches) and a compressed air connector, can refrigerate machines,
enclosures, cabinets, and so on.
>There are comercial & industrial products available based on that
>system. I use to receive literature from them. A small cilinder (5
>inches) and a compressed air connector, can refrigerate machines,
>enclosures, cabinets, and so on.
The Germans used them in WWII in some of their aircraft.
> >There are comercial & industrial products available based on that
> >system. I use to receive literature from them. A small cilinder (5
> >inches) and a compressed air connector, can refrigerate machines,
> >enclosures, cabinets, and so on.
>
> The Germans used them in WWII in some of their aircraft.
>> The Germans used them in WWII in some of their aircraft.
>Not exactly, they used them to make LOX for V2s.
("them" here is a Hilsch Vortex tube.)
If this is true I'd LOVE to have details.
The time honoured LOX making technique is Joule Thomson expansion and a
counterflow heat exchanger.
This needs very high pressures (3000 psi plus is best). The Maxwell's demon
uses typically 100 psi. A JT nozzle at 100psi would very likely not get
above the thermal leakage level.
The two methods look similar from a distance but employ quite different
physics.
The important difference is that the Maxwells demon / Hilsch Vortex / Wiebel
Rohr is separating out already existing high and low energy molecules while
a JT nozzle is using a perverse property of air (and some other gases) and
doing "internal work" on it (actually, by it) which causes cooling to occur
INTERNALLY. The INTERNALLY is important because it allows you to use a
regenerativce process to cool each successivley arriving portion of gas down
to successively lower temperatures. The Maxwell's demon doesn't allow this
regenerative effect as far as I am aware (and I have tried very hard to work
out how to allow it to in the past :-)).
IF I am wrong and it can be done, please show me how.
RM
_____________________________
What can one man do?
Help the hungry at no cost to yourself!
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>> >There are comercial & industrial products available based on that
>> >system. I use to receive literature from them. A small cilinder (5
>> >inches) and a compressed air connector, can refrigerate machines,
>> >enclosures, cabinets, and so on.
>>
>> The Germans used them in WWII in some of their aircraft.
>
>Not exactly, they used them to make LOX for V2s.
>
At 10:22 24/09/99 -0400, you wrote:
>>There are comercial & industrial products available based on that
>>system. I use to receive literature from them. A small cilinder (5
>>inches) and a compressed air connector, can refrigerate machines,
>>enclosures, cabinets, and so on.
>
>The Germans used them in WWII in some of their aircraft.
>
>Andy
>
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