Quote:
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"heat transfer is proportional to the temperature difference on the object. If the temperature differential doubles, the heat transferred doubles"
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Ive done a fair amount of twisting, and knew about this particular aspect of thermodynamics, but was quite surprised to see it so graphically illustrated when putting a little extra heat with a large oxy-acetylene rosebud.
There you are with a cherry red bar in your twisting jig, drop the flame on a portion of it and watch as part of it turns yellow, but just down the way in both directions is a bit cooler than the rest of the bar, as the heat is robbed, flowing to the higher temperature section faster than it can be replaced by the remaining bar, the banding quickly equalizes once you take the torch away and the heat is transferring the other way from the hotspot to the rest of the bar.
you may have noticed it, maybe not, but its pretty cool
(pun intended
)