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| Source - XKCD.com/2743/ |
See, it's funny because I've never thought about that being the reason hand dryers don't seem to put out hot air as quickly as it seems like they should.
It's the same idea as trying to brown a steak. If the outside of the steak is wet, the outside can't brown because the energy is going to evaporate the water which has to happen until all the water is gone, keeping the surface of the meat no hotter than 100 C. Once that water is gone, however, the steak's surface can get hotter and can brown.
Once your hands are dry, they can feel the warmth.
Until then, though, you just get evaporative cooling.
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