Half a croissant, on a plate, with a sign in front of it saying '50c'
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Microwave from underneath

Heat your food from underneath
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Ever microwave a bowl of soup and have it come out with the top layer piping hot and the bottom cold? My idea is simply to have a microwave that directs it energy up at the food from underneath, instead of from above. Either locate the magnetron underneath the food compartment, or use a simple hollow waveguide to channel the energy.

Thermal convection would help the heat from the bottom of your food rise up into the rest of your food, making the heating much more uniform.

Alpharaul, Aug 18 2012

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       This is definitely amongst the top two of your posts.   

       [+]
MaxwellBuchanan, Aug 18 2012
  

       This is definitely Baked, although perhaps not Widely Known To Exist.   

       Philips microwave ovens from the 1980's had microwave-transparent floors to the chamber, no turntable, and dual rotating reflectors to give very even irradiation.   

       Sorry, but suggested for deletion; not a new idea.
8th of 7, Aug 18 2012
  

       Sure sounded good though.
blissmiss, Aug 18 2012
  

       Deletion challenged on grounds that attempted idea is halfbaked.
rcarty, Aug 18 2012
  

       or combining a microwave with an icecube dispenser superheating a cube by microwaves and dropping it into the cold soup.
rcarty, Aug 18 2012
  

       rcarty - Now there's a real idea. Ice cubes boiling inside with much more heat energy than the surrounding ice cover, with a "shelf" life of say half a minute. Hold them in your hand for a second or two and put them in your cup, for a boiling hot cup of tea.
pashute, May 28 2014
  

       Re boiling ice cubes: for maximal effect, the outside should be absolute 0. I suppose in concession to practicality it could be the temperature of liquid helium, which many places have handy.   

       I am concerned that extremely hot water would be superheated steam and so crack the cube. Maybe the maximal water temperature is 99.9 C?
bungston, May 28 2014
  

       yeah I'd go for the 99C... make coffee @ 70C or something. Gonna need a maser and some way of focusing it though, to heat the inside without heating the outside.
FlyingToaster, May 28 2014
  

       The waveguide could be built into your soup bowl. A double-walled bowl, sealed at the rim with a microwave transparent material (plastic, glass, some ceramics, etc). The inner face of each wall is lined with steel. At the base of the bowl, a conical dimple in the bottom layer of steel scatters the microwaves upwards, and a window in the top layer allows microwaves up into your food.   

       No modification or redesign of the household microwave oven required. The bowl would appear to be a perfectly ordinary, if slightly thick, bowl.   

       Bonus: evacuate the space between the two walls, and provide a similar double-walled, evacuated lid. You now have a Thermos bowl to keep your hot soup hot.
BunsenHoneydew, Jun 07 2014
  
      
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