[SI-LIST] Re: Honey, your conductors are ready!

  • From: "Haller, Robert" <rhaller@xxxxxxxxxxxxxxxxxxx>
  • To: "jwalden@xxxxxxxx" <jwalden@xxxxxxxx>
  • Date: Fri, 14 Nov 2014 20:06:43 +0000

I just read the experiment to my two daughters 18 and 25.
The oldest one said, Dad, you don't have to be an engineer to know it's going 
to ruin the microwave...
LOL  my wife would never have done it...
Regards
Bob Haller


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Jeff Walden
Sent: Thursday, November 13, 2014 5:25 PM
Cc: si-list
Subject: [SI-LIST] Re: Honey, your conductors are ready!

Slow day in China?
Yuriy, the actual experiment might have really been, "what can I talk my wife 
into doing"?

On Thu, Nov 13, 2014 at 4:46 PM, Yuriy Shlepnev <shlepnev@xxxxxxxxxxxxx>
wrote:

> Jeff,
>
> I would rather do it in virtual reality :-) There is actually software
> designed to simulate the heating process in microwave ovens - QWED
> http://www.qwed.com.pl/examp_mheat.html
>
> Best regards,
> Yuriy
>
> Yuriy Shlepnev, Ph.D.
> President, Simberian Inc.
> 3030 S Torrey Pines Dr. Las Vegas, NV 89146, USA Office
> +1-702-876-2882; Fax +1-702-482-7903 Cell +1-206-409-2368; Virtual
> +1-408-627-7706
> Skype: shlepnev
>
> www.simberian.com
> Simbeor - Accurate, Fast, Easy and Affordable Electromagnetic Signal
> Integrity Software
> 2010 and 2011 DesignVision Award Winner
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On
> Behalf Of Loyer, Jeff
> Sent: Thursday, November 13, 2014 1:21 PM
> To: si-list (si-list@xxxxxxxxxxxxx)
> Subject: [SI-LIST] Honey, your conductors are ready!
>
> I thought you all might enjoy hearing the results from an experiment I
> recently concocted (but haven't yet completed).  Here's how it was crafted:
> Cut 2 identical squares of aluminum foil.  Shape one of those into a
> ball, really tight and compressed (sphere = minimum surface area).
> Leave the other one flat (maximum surface area).  Put them both in the
> microwave and heat them for 15 seconds (not sure of exact time).  See
> if there's a significant difference in the temperature between them.
> The flat sheet should be much hotter - more surface area for the
> microwaves to impinge upon.
> Here's what I've learned from this exercise so far:
>
> 1)      Don't do this unless you're prepared to buy a new microwave, or can
> live with lots of singe marks.
>
> 2)      If you blow the microwave circuit breaker, reset it quickly if you
> have a freezer on the same circuit.
>
> 3)      Don't have your spouse try this while you're in business in China -
> wait until you can do it properly.
>
> 4)      The foil has to be small enough not to contact the walls.
>
> As you can guess, I asked my spouse to try it.  I'm in China but was
> anxious
> to hear the results.  I should have waited! :-)   Here's the text from her
> synopsis:
>
> "Well.  Our microwave looks like he[ck] - burned the door seal, and
> put black streaks on the back wall.  My flat piece of foil was not a
> square - it was a rectangle, so the edges grazed the sides of the box
> insides as the tray rotated.  There was lots of arcing, sparking, and
> color.  But as far as
> Kath and I could tell, neither piece got warm!!!!   Go figure!
> I could try again.  [note from Jeff: how did I find this woman?!?!] I
> began with a rectangular piece approximately 4 inches by 6 inches.
> Should have tried a square.
> Had difficulty making a ball out of the one piece, after a certain
> point of compressing it.  It was a little more of a prism than circular.  But 
> close.
> We weren't clear if you wanted both pieces in the microwave at the
> same time, or if the test should be run separately for 15 seconds.  We
> (Kath and
> I) decided to put them both in, beside each other, but not touching.
> All the arcing activity caused the ball to roll under the rectangle, though.
> At
> least so it seemed.  The pieces were lightly stuck together when we
> were done."
>
> Anyway, I still think it's a cool demonstration of the fundamental
> principle that a layman can try (if they're brave or dumb).  There's a
> nice limit that, if the sphere is small enough to equal the skin
> depth, the two pieces will heat evenly (I think).  I'm anxious to try
> it when I get home.
>
> If you choose to try this in the next week at the risk of your
> microwave and food in your freezer, please let me know what you find.
>
> Cheers,
> Jeff Loyer
>
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--
Jeffrey L Walden

EMC/SI RF analysis and product development http://www.linkedin.com/in/emcsirf
jwalden@xxxxxxxx
(866)547-5365


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