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Current time: 29th March 2017, 19:01

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The Pecular Behavior of Fire
#21
RE: The Pecular Behavior of Fire
(17th November 2016, 19:30)vorlon13 Wrote: Ever wonder why the plume coming out of the back end of a rocket gets so big the higher the rocket goes?

Less air pressure up there, so the exhaust fans out more.

Which causes a major design problem for bell shaped rocket engine exhaust nozzles. The design is governed by the expected rate of expansion of exhaust gas. But exhaust gas expands faster in vacuum of space or thin high atmosphere than in dense lower atmosphere. So an engine bell designed to maximize thrust at sea level loses thrust at altitude, and vice versa.

Hence aerospike.
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#22
RE: The Pecular Behavior of Fire
Does convection have anything to do with the triangular shape of fire? Oddly enough, I found the word while looking for info about earthquakes.
Nietzsche isn't dead. How do I know he lives? He lives in my mind.
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#23
RE: The Pecular Behavior of Fire
Yes. Heat rises. As it rises away from the heat source, the heated gases begin to cool. The gases at the circumference of the updraft cool first, because they're exposed to cooler air more than the center of the column. Losing heat, there's more fire tetrahedron, and the flames are foreshortened, leaving the fire looking like a cone.
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#24
RE: The Pecular Behavior of Fire
(31st January 2017, 19:36)Thumpalumpacus Wrote: Yes. Heat rises. As it rises away from the heat source, the heated gases begin to cool. The gases at the circumference of the updraft cool first, because they're exposed to cooler air more than the center of the column. Losing heat, there's more fire tetrahedron, and the flames are foreshortened, leaving the fire looking like a cone.

Kewl! I guess that accounts for why fire dances.
Nietzsche isn't dead. How do I know he lives? He lives in my mind.
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