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RE: spark energies


I was wondering about that too.  What if
a long (15') by couple inch diameter tube
were attached to the coil at one end and
grounded at the other end or (variable load).
By lowering the air pressure inside the tube
certain aspects of the spark could be studied.
As the pressure were lowered the "spark"
would be prefer the tube.  If the characteristics
were charted VS. pressure could the data
be extrapolated to atmospheric pressure
and divided among the multiple sparks
which
sometimes are present on the toroid?
The spark losses from various effects
could be accounted for by a differential
(current, voltage?) measurement at the
opposite ends of the tube containing the
low pressure spark.  Rogowski coil +
led + optical fiber into phototransistor
+ amplifier at the hot end.
Multiple tubes would be even more
realistic but difficult.

The capacitive effect of the walls
would alter things a bit but might
be accounted for somehow such
as taking data with different diameter
tubes.

The lucite ball worries me also because
of a possible capacitive effect which
might make the sparks cook it.  Glass
might survive longer.  The r12 might
help the outside but the sparks with
ensuing ionic bombardment might
make short work of the inside would
be my guess.  I cooked a hole in
plexiglas this way and it didn't smell
too good either!

Barry

 ----------
|From: "tesla-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|To: Benson Barry; "Tesla-list-subscribers-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|Subject: spark energies
|Date: Friday, November 01, 1996 3:10AM
|
|<<File Attachment: 00000000.TXT>>
|From hullr-at-whitlock-dot-comThu Oct 31 22:48:03 1996
|Date: Thu, 31 Oct 1996 17:57:25 -0800
|From: Richard Hull <hullr-at-whitlock-dot-com>
|To: tesla-at-pupman-dot-com
|Subject: spark energies
|
|I just got to thinkin' deeper over a "samich" at lunch.  In my post on
|spark energy, I would literaly have to account for all energies created
|by the sparks themselves in my scenario.
|
|Help me out guys.
|
|I have tried to think of all the posibilities, but doubt I have covered
|them all.  A mental conclave might be in order.  I have also opted for a
|large 15" spherical lucite ball which I have as the sparking chamber.
|This material is a poor conductor of heat and a blanket of R-19
|insulation over the ball should trap most of the heat within provided
|quick mesurements are made. I hope to use my little 15VA coil system on
|this one.
|
|I will, unfortunately, be unable to use a toroid in the chamber due to
|its thermal mass screwing with the air temperature. A small tungsten
|pointed needle will be the discharge point. (low thermal mass).
|
|As the spark rips through the air it disappates its energy in the form of
|light, noise, heat, and ion production (which ultimately winds up as heat
|as the ions recombine).  In air, sparks produce little RF energy, but a
|grounded arc channel produces short waves at a prodigious rate.  (must
|avoid spark hits in my test).
|
|I believe that the light and noise are a very small component and in a
|sealed chamber, a lot of the more energetic light, (uv), will ionize the
|local air anyway and a large portion of these ions will be placed in the
|chamber in the form of heated air as these, in turn, recombine.
|Electrical, resistive, heating of the arc channel is the bulk of the
|energy dissapated, although the ions produced by this little coil have
|been shown by me to account for a very healthy amount of energy.  Again,
|If I can just let them recombine in the ball enclosure, all will go to
|heat.  I am a little concerned that the ball will become dielectrically
|charged and the energy from the ions producing this charge will
|ultimately leak out to the outside air as soak through charging as in
|series capacitor units.
|
|By the way, I plan on scoping the input voltage across the transfomer on
|one channel "A" and the current via a Pearson wideband 1844 CT on channel
|two "B" and create a third mathed channel of A X B for a true time/energy
|plot on my tek TDS 340 digital scope so that I have a real handle on what
|went in.   I'll use my K type thermocouple meter by Precision to take the
|before and after rectal temps on the fixed volume of air within.
|
| Another problem... the air is trapped and not circulating and will skew
|the results in some fashion, I am sure.  But, still, this is the best I
|have heard of being attempted in this area, yet.
|
|I picked up on all this here in our lab two years ago when running
|Nemesis at 13KVA resulted in noticably increased air temps after long
|runs.
|
|Any thoughts on this guys!  Really good experiment is never easy to make,
|especially if you plan on having anyone take your results seriously.
|
|Richard Hull, TCBOR
|