On 11/28/2014 11:48 AM, drlegendre . wrote:
So we have a situation wherein aluminum pots
aren't at all suitable for
cooking, but yet foils of the same (well, a very similar) metal will burn
right through. To me this means that it should be possible to design a
purely aluminum, non-magnetic vessel of some particular shape and thickness
that does more-or-less work on an induction cooker.
Okay, I grabbed some aluminum foil from yesterday's turkey roast (FWIW,
the "dry brining with herbs under the skin" works wonderfully).
Interesting effect--the foil must be in close proximity to the coils to
heat up--and it does indeed do that very quickly. Move it an 1/8" away
and the effect is negligible. What's interesting is to see the foil
"jump" when power is applied.
So it seems that iron does play a part in providing a magnetic path.
Carrying this on further, I have some 18/10 pots with a slab of aluminum
(as a heat spreader) laminated into the bottoms. Nada, zip. I also
have an 18/10 double boiler whose bottom is a hunk of copper bonded to
the steel. Again, nothing.
Hmmm, I smell some more experiments. I have several thicknesses of
brass sheet (used as shim stock) down to about 5 mills. It will be
interesting to see if the 5 mill is thin enough to produce a heating
effect--and if backing by a thicker metal interferes with the effect.