Here's a related question, Suppose I have a vertical metal cylinder that is being heated by combustion gases from the inside - for the sake of argument - like a 48" length of 12" diameter 316 stainless steel flue pipe.
Let's assume that this pipe is getting hot - dull orange, even when the outer surface is exposed to free air. If I then enclose this pipe in an annular sleeve - again 48" long - open at each end, like a 14" diameter tube - so that there is a 1" annular gap for air to freely be drawn into, will the effect of this sleeve create a beneficial flue effect, and increase the velocity of the cooling air draught around the flue pipe? I'm considering this arrangement as a means of delivering preheated air, and providing cooling to a large woodgas burner. Any thoughts Ken
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