I have used a *volcanoe/ Kelly Kettle whilst camping and wondered if its funnel shape speeds up the heating process i.e. does the shape compress the gases making it burn hotter ? If so, can we use that shape in a rocket stove to make it more efficient to heat water for my house ?
* A volcanoe/ Kelly Kettle is basically a double-walled chimney with the water contained within the chimney walls. It is a based on rocket stove principles and heats water incredibly fast.
In my observations of my Kelly Kettle, the smoke occasionally ignites for a secondary burn. Which is similar to a rocket stove. But this happens at the upper lip of the chimney, where the extra heat probably can't heat the water very much. But I do think that the water jacket creates a positive feedback loop that helps the fire burn a bit hotter as the water heats up.
Tradition is not the worship of ashes, but the preservation of fire.
Where a gas or fluid passes through a pipe that narrows or widens, the velocity and pressure of the gas or fluid vary. As the pipe narrows, the gas flows more rapidly.
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