h a l f b a k e r yNot so much a thought experiment as a single neuron misfire.
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It is not possible to effectively microwave canned food without removing the food from the can.
The canned food microwave has a waveguide assembly which clips over the top of the can with its lid removed. A portion of the waveguide may penetrate the contents. A mechanical stirrer may be necessary.
Insert the can into the unit. Engage the waveguide. Push the start button. The contents of the can are automatically heated to the programmed temeperature.
Eat the food. Lick the spoon clean and put it back in your pocket. Throw the empty can away. Job done.
microwave tricks
http://margo.studen...te.nl/el/microwave/
[rbl, Sep 17 2002, last modified Oct 21 2004]
off topic - neat little link to put "niggly" into context
http://www.whom.co.uk/html/neumonic.htm
[po, Sep 17 2002, last modified Oct 21 2004]
Fired for saying "niggardly"
http://www.adversit...ecial/niggardly.htm
[FarmerJohn, Sep 17 2002, last modified Oct 21 2004]
Thaksgiving in a can
http://www.halfbake...ving_20in_20a_20can
For those who are impatient as well as lazy. [8th of 7, Sep 17 2002, last modified Oct 17 2004]
Cheeseburger in a can
http://gizmodo.com/...thing-ive-ever-seen
[Mister P, Feb 13 2008]
Gunn diode
https://en.wikipedia.org/wiki/Gunn_diode
Fascinating device [8th of 7, Oct 04 2020]
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Annotation:
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I thought metal objects in a micro-wave oven produced arcing. |
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It's too much trouble to dump the contents of the can onto a plate, but you're willing to go through the convolutions of connecting a waveguide to the top after opening the can? Then what? Eat out of the can? |
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- is that like Pot Noodle, bliss? |
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cook him a meal. he looks HUNGRY. |
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hey bliss, have you noticed how niggly people get when they are on a diet? there's an idea there somewhere. |
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While they are perhaps less common than they used to be, there are vending machines which keep canned food hot continuously. Insert money, pull the lever, grab a spoon (often kept in a box conveniently close to the machine), remove the top of the can, and proceed to eat a can of rotini-in-sauce, baked beans, or other such foodstuff. |
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Applying this principle to a home appliance shouldn't be difficult, and would have the advantage that one wouldn't have to wait for one's food to be warmed (unlike when using, e.g. a microwave). The question of whether to leave the food in the can would be up to the individual user. |
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link for blissy. no idea where that word originates. |
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just had a quick peek in the dictionary - niggle (noun) = small worry. |
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When we got our first microwave it came with a big warning about NOT microwaving eggs still in their shells... |
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Took us ages to clean all the egg out, fortunately the oven wasn't damaged. We was fascinated by the creaking, ticking noise the shells emit just before they rupture. |
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The idea is that the can itself forms the outer shell of the "oven" with the waveguide sealing onto the lid. It would work better with wide, low cans, like Heinz canned puddings (Aaaaahhhhhhhh .....). |
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BinaryCookies seems big on canned turkey and suchlike, best ask him ..... |
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A question has been asked, "Could this device be used to re-heat the contents of an all-stainless-steel travel mug, the sort that's vacuum insulated ?" |
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The answer seems to be "There's no reason why not". |
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Actual experimentation may be imminent ... |
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Hmm... how small & portable (& battery-powered...) could
a magnetron be made? |
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For low-power applications, a Gunn diode <link> is the weapon of choice. It depends on what the task is. |
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Yes, magnetrons can be "battery-powered" if necessary (though inverter circuitry may be needed) but the two main applications are cooking (where the objectve is energy transfer) and Radar (where the inverse-X^4 characteristic engenders huge requirements for output power for modest increases in effective range). |
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So, "Yes, but it might need to be a BIG battery". |
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"On-the-go" use case is probably limited to 3 or 4 usages
daily, heating up coffee or soup or whatever else people put
in their travel mug. Size should be similar to a large travel
mug, which is a reasonable sized battery. Can microwaves
be made to resonate in an enclosed chamber? |
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Some people actually get a bowl messy when
the food is already in a can? What slobs! |
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One can put the (unopened) can in an electric
kettle with enough water to cover. Run the
kettle a few times. Write "this side towards
enemy" below the ring-pull. |
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Its not strictly necessary to warm the food before eating. Its just habit. You can easily train yourself to prefer cold beans or whatever tinned delicacy you prefer. |
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Correct. Some are actually better that way- "Vengeance is a dish best served cold" ... |
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Is induction heating of the can itself energetically cheaper? An insulation slip could make sure heat goes inwards first. |
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The problem is more one of diffusion. The contents of most cans, when cold, tend to be fairly viscous, thus there's little or no convection- heat transfer is purely by conduction. |
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The issue was recognised with WW2 "Compo" tinned rations which were notorious for needing prolonged heating to become acceptable; the recommended procedure was to place the unopened tins in boiling water. |
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Induction heating will heat the can efficiently, but that heat will take time to spread through the bulk material, whereas microwaves do penetrate to a more useful depth. |
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