I've seen this happen in my first propane forge design before the refractory gets up to heat, the jet will heat up the bar, with the acception of directly under neath it..
I always just assumed that this was because the fast speed of some of the gas was cooling it, but this makes more sense.
weird stuff..
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Deep poetry-
A monk told Joshu: "I have just entered the monastery. Please teach me."
Joshu said: "Pull my finger."
At that moment the monk was enlightened.
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