Pumping Liquid Nitrogen

External Since: Nov 21, 2007 Posts: 6

"Paul Hovnanian P.E." <paulh DeleteThis @seanet.com> wrote in message
news:476C19BC.94527DC6@seanet.com...
> With an LN2 environment, the rotor and stator might shrink a bit, so the
^^^
> design should account for a slightly larger air gap than at room
> temperature.

You mean smaller gap?

Tim

--
Deep Fryer: A very philosophical monk.
Website @ http://webpages.charter.net/dawill/tmoranwms

External Since: Nov 19, 2007 Posts: 170

Somewhere on teh intarweb "Guy Macon" typed:
> ~misfit~ wrote:
>
>>> Phil Weldon wrote:
>>>
>>>> For actually pumping liquid nitrogen you could contact NASA
>>>> for a few tips... especially safety tips.
>>>
>>> You are talking to the person who taught the cryogenic
>>> safety classes for Parker Hannifin on the space shuttle
>>> 17 inch disconnect project -- under contract with NASA.
>>
>> And you're asking your questions here because all those
>> contacts you made are ob holiday?
>
> Experience designing the 17 inch wide valve that connects the
> external tank to the space shuttle doesn't apply much to the
> problem of finding a small, cheap pump for less than a liter
> per hour of liquid nitrogen.
>
>>>> Taking a flyer with a Pentium III is hardly worth the effort.
>>>
>>> You prefer I ruin a few Core Duos while I experiment?
>>
>> Sure, with the money you made from a morning's teaching cryogenic
>> safety classes
>
> The word "taught" is past tense. I no longer work for Parker.
> The Jamboree Blvd. plant closed down quite some time ago.
>
>> you could ruin a few Core Quads. After all, you can afford
>> a liquid nitrogen generator, what's a few hundred bucks
>> worth of CPUs? Trying it with a PIII is like learning to
>> drag-race in a pedal-car.
>
> If I was thinking of trying something that could burn out my
> expensive drag racer, I might very well try it on a few pedal
> cars first. Even if I could afford to destroy multiple race
> cars.
>
>>>> One possibility for a more or less continuously operating
>>>> cooler would be to use the boil-off of liquid nitrogen to
>>>> chill an anti-freeze mixture (propylene glycol & water
>>>> ~ 50:50 should be good to below - 40) that you could then
>>>> pump through a more or less stock CPU water block.
>>>
>>> I don't want minus 40. I want minus 196.
>>
>> Well Mr. Cryo-teacher, be sure to let us know how it works
>> out for you. Or not.
>
> "Arguing with anonymous strangers on the Internet is a sucker's
> game because they almost always turn out to be -- or to be
> indistinguishable from -- self-righteous sixteen-year-olds
> possessing infinite amounts of free time."
> -Neil Stephenson, _Cryptonomicon_
>
> *plonk*

Indeed, what one would expect from someone with little grasp of the English
language.

I'm a great believer in the passage that you quoted above. That's why I
don't engage in *arguments* "on the internet". (Hint: Look up the word,
re-read my post...)

Oh, and from your website:

"HARDWARE DESIGN; I am an *expert* in *all areas* of electronics, including
analog, digital, microcontroller, high-power, low-power, high volume,
aerospace and consumer electronics."

(My ** emphasis)

Seems that you should be helping us instead of only coming here for help.
Mr. Expert.

Buh-bye.
--
TTFN,

Shaun.

"another academic failure.... trying to prove that your smart"
'blanking', nz.comp, 20 Dec 2007.