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Re: Nitrogen VS Compressed air quenching



Original poster: "June Heidlebaugh" <rheidlebaugh-at-desertgate-dot-com> 

The presents of oxygen changes the arc voltage a great amount. Nitrogen or
any other gas has a known breakdown voltage. WHEN OXYGEN IS PRESENT THE
BREAKDOWN VOLTAGE BECOMES UN PREDICTABLE.
    Robert   H
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, May 03, 2004 8:16 AM
Subject: Re: Nitrogen VS Compressed air quenching


 > Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net>
 >
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Sunday, May 02, 2004 3:42 PM
 > Subject: Re: Nitrogen VS Compressed air quenching
 >
 >
 >  > Original poster: "john cooper" <tesla-at-tesla-coil-dot-com>
 >  >
 >  > I've added photos of my prototype nitrogen manifold to my website,
here's
 >  > the link:
 >  >
 >  > http://www.tesla-coil-dot-com/bipolar.htm
 >  >
 >  > They're at the bottom of that page.  There's a photo of it installed in
 > the
 >  > original cabinet and two close-ups of the manifold that I just took
 >  > today.  For quenching ability the nitrogen is extremely effective while
 >  > compressed air is barely noticeable, apples and oranges.  FWIW a 42
cubic
 >  > foot bottle costs about 14.00 to fill and lasts for two 8 to 10 minute
 >  > runs, the bottle and regulator were around 400.00
 >
 > I'll bet a 300 cu ft T sized bottle doesn't cost much more to fill.  A few
 > (<5) years back, I was paying around $16 for a T bottle of nitrogen.  You
 > don't need any exotic grade, of course.
 >
 >
 > I wonder why there's such a huge difference.  Could it be temperature
 > related?  If 42cu ft lasts for 16-20 minutes, that implies an airflow of
 > 2cfm.
 >
 > If nitrogen is a lot better, then rigging up a compressor (or a fan) and
 > some cooling tubing with a recirculating arrangement might be worthwhile.
 > You're running 100 psi, but I assume that's at the regulator.  What's the
 > pressure at the gap (or, more properly, at the orifices). Are you at
choked
 > flow (i.e. the flow through slot/hole is supersonic)?
 >
 >