Re: The Freau number...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Steve,

I think it will always have to have a dimension.  It will always be some 
length/some energy term...

We could easily write it as:

Spark length (meters) = F x (bang energy x BPS)^0.5

That way we can change the "0.5" if needed.  So,:

F = (Spark length (meters)) / ((bang energy x BPS)^0.5)

The dimension really gets odd if we us 0.6...

I liked Freau number since I never can spell "coefficient" ;-)  There is 
also "Freau Factor"....

Cheers,

        Terry




At 05:03 AM 6/18/2005, you wrote:

> >        Spark length (meters) = F x SQRT(bang energy x BPS)
> >
> > "F" would stand for "Freau" so John will be eternally famous!!  I would 
> > suggest going to meters just to keep things "scientific".
>
>
> I agree that "F" is a handy way of measuring coil performance, a bit like 
> the specific impulse for a rocket or such like. But I wonder if there is a 
> way to make it into a proper dimensionless number. Otherwise you have to 
> call it the "Freau coefficient" with its rather unwieldy dimensions of 
> "metres per root watt".
>
> Also I remember Nick Field mentioning that the law may not be quite a 
> square root. Square rooting is raising to the power 0.5, and he suggested 
> the exponent might actually be nearer 0.6 or something.
>
> I suggest the "Watts number" (streamer length divided by resonator length) 
> as another handy parameter. Some day I ought to try making a graph of F 
> vs. Wa for a coil and see if it throws up any interesting results.
>
> Steve Conner