Re: [Phys-l] transformer question

[Bernard Cleyet <bernardcleyet@redshift.com>]

In searching for the validity limit of Poiseuille's  law [length/ 
diameter > ?]  I found a paper on the validity of Kozeny-Carman  
formulae in porous media (e.g. sandstone) using lumped resistance  
meshes!!

bc gave up


BTW anyone know if (length / diameter) > 10 is "good"?   I suppose  
it'll vary according to the flow rate (changing the Reynolds' #), etc.


p.s. for the curious:


http://www.osti.gov/bridge/servlets/purl/10113412-EeskIR/webviewable/ 
10113412.pdf







On 2009, Aug 14, , at 15:35, John Denker wrote:

> I don't recall hearing or reading anything about non-ideal
> transformers or mutual inductances ... but they *did* tell
> us "the same equations have the same solutions" and if we
> live to be 2000 we will never forget that.  And the equations
> for inductors are almost the same as the equations for
> capacitors, given a trivial change of variables.