[time-nuts] Thunderbolt stability and ambient temperature

J. Forster jfor at quik.com
Thu Jun 11 11:00:53 EDT 2009


It has nothing to do with this.

A long (length >> width) bar can simply be modeled as a long ladder of
series resistors's and capacitors to ground:

---zzz---zzz---zzz----  ...  ---zzz---
   _|_   _|_   _|_              _|_
   ___   ___   ___              ___
----| ----|-----|-----  ...  ----|-----

If you put a rectangular pulse in the left end, it will emerge later and
very much rounded at the right end.

Either do the math or simulate it in Spice or with a handful of R's and
C's and a pulse generator and scope.

No inductors needed. PERIOD. That model fully accounts for your
observations with the bar heated at one end.

-John

=================



> In message <4A309B30.7000400 at sonic.net>, Rex writes:
>
>>My observation, from doing this
>>several times, is that the cold water quickly absorbes heat from the red
>>end, but also seems to chase a lot of the heat quickly up toward the
>>cold end, making the bar rapidly uncomfortable to hold.
>
> I've seen the effect you describe explained in an article somewhere,
> very likely New Scientist or SciAm about five years ago.
>
> When you rapidly heat or cool metals, very often changes in crystal
> lattice structure is involved some of them resulting in quite drastic
> changes to volume.
>
> Heat is essentially atoms wiggling about, and when you change the
> modes of freedom for the atoms, they may have to wiggle harder.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by
> incompetence.
>
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