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RE: [TCML] Best bottle cap electrolytes, was re:HV capacitors wanted
Would you have a link to a table of conductivity of solutions? I was
unable to find one...
Many thanks
Thomas
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of FIFTYGUY@xxxxxxx
Sent: 04 December 2008 09:32
To: tesla@xxxxxxxxxx
Subject: [TCML] Best bottle cap electrolytes, was re:HV capacitors
wanted
In a message dated 12/2/08 9:43:03 A.M. Eastern Standard Time,
pslawinski@xxxxxxxxx writes:
>If you're stuck with glass bottle capacitors, you should try baking
soda and
>water instead of salt and water. Supposedly baking soda is more
>conductive.
I found that hard to believe (I work for a company that
manufactures
electrolytic cells for on-site generation of chlorine gas from table
salt). A
saturated NaCl solution has a conductivity of around 0.25 S/cm.
I've also used the electrolytic process for rust removal, and it's
generally agreed that sodium bicarbonate is one for the slowest-working
electrolytes for that application. Sodium Carbonate (baking powder)
works more quickly.
Here's a science fair project where various salts were evaluated
for
conductivity specifically for Tesla coil bottle capacitor applications:
:http://www.usc.edu/CSSF/History/2005/Projects/J0535.pdf
BTW, Sodium Hydroxide would have 50% better conductivity than NaCl,
but
it has a decreasing conductivity once you get over 20 percent
concentration.
The conductivity of various salt solutions can be highly dependent
on
temperature, are typically non-linear, and as in the case of NaOH, can
have a
local maximum with regards to concentration.
Hydrochloric Acid (HCl) at the 37% azeotrope would have three times
the
conductivity of saturated NaCl.
It would be interesting to see if the conductivity of the
electrolyte in
the bottle caps made any noticeable difference. After all, they
represent a
pretty big surface area, and the spark gap has a dynamic impedance in
the
neighborhood of a few Ohms. Using more bottles that were smaller could
have
just as large an effect as using a different electrolyte, and the would
also
theoretically improve the AC impedance of the cap bank as well.
Probably also
help mitigate heating of the glass in the caps as well.
-Phil LaBudde
Center for the Advanced Study of Ballistic Improbabilities
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