RE: Primary Heating

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Peter,
          Nice try. I was also impressed by Bert's suggestion. That 
one would have implied that the effective cross-sectional area of the 
primary conductor was greatly reduced in the inner turns (as a result 
of the magnetic fields interacting with the inner turns.
      Here's another thought for the mix: Perhaps the entire primary 
is heating but the outer turns are being cooled more effectively by 
their greater exposure to the air. I haven't observed this but will 
look for it sometime. The idea would be to construct a primary with 
considerably smaller copper than the norm so there is every chance it 
will generate some heat.

Regards,
Malcolm


On 4 Mar 2002, at 20:50, Tesla list wrote:

> Original poster: "Peter Lawrence by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <Peter.Lawrence-at-Sun-dot-com>
> 
> Guys,
>      hot air convection will tend flow up along the secondary, drawing air
> from near the inner primary turns which in turn draws air from the outer
> primary turns. Thus the outer turns are cooled by convection and the inner
> turns are heated by convection.
> 
> just a theory, your milage may vary,
> Peter Lawrence.
> 
> 
> 
> 
> >
> >Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
> <Gary.Lau-at-compaq-dot-com>
> >
> >
> >Forgot to mention, I've observed the inner-turn-only heating both on my
> >"normal" flat primary, and also on my two-layer primary, where the top &
> >bottom spirals are joined in the center, with fuse-clip connections to the
> >outer ends.  See http://www.laushaus-dot-com/tesla/primary.htm.  Once again,
> >only the inner turns became warm.
> >
> >Gary Lau
> >MA, USA
> >
> >My innermost primary connection is by means of a very beefy copper strap,
> >securely soldered to the end of the tubing, and the connection to the strap
> >~ 2" distant by means of a 1/4" bolt.  The outermost primary connection is
> >the movable tap, and this by means of two fuseholder clips.  This is where
> >I'd expect to see ohmic heating, but do not.
> >
> >Gary Lau
> >MA, USA
> >
> ><snip>
> >
> >
> >
> 
> 
> 
>