Re: Resonant Modes in a Conical Cavity
- From: Dirk Bruere at NeoPax <dirk.bruere@xxxxxxxxx>
- Date: Fri, 3 Nov 2006 23:52:15 +0000 (UTC)
Greg Egan wrote:
In article <20061101213000.1A0394C309@xxxxxxxxxxxxxxxxxxxx>, Greg Egan <gregegan@xxxxxxxxxxxxxxx> wrote:
[snip]the presence of (a) air, and (b) heat, doesn't leave much of a mystery about where Shawyer's measured force might be coming from.
I've added a new section to the web page:
http://gregegan.customer.netspace.net.au/SCIENCE/Cavity/Cavity.html#CURRENT
S
which shows the distribution of heat production along the cavity wall. Given the asymmetry of both the cavity itself and the pattern of heating, it's highly likely that the airflow produced would create a net force -- and with a kilowatt of power to dispose of, accounting for 300 millinewtons would not be hard.
The cheapest way to see what was really going on, rather than putting this thing in a vacuum chamber (let alone into orbit), would be to build a "dummy" cavity, with no microwaves but with heating elements arranged around the wall to mimic the pattern of heating. If you pumped a kilowatt of power directly into the heating elements, I'd be amazed if there was no detectable force from the airflow.
Even simpler - put the whole apparatus in a box.
There would then be negligible external airflow and it would likely be thermally isotropic externally (depending on degree and structure of insulation)
--
Dirk
http://www.onetribe.me.uk - The UK's only occult talk show
Presented by Dirk Bruere and Marc Power on ResonanceFM 104.4 http://www.resonancefm.com
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