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The Pecular Behavior of Fire
#21
RE: The Pecular Behavior of Fire
(November 17, 2016 at 7:30 pm)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.
The god who allows children to be raped out of respect for the free will choice of the rapist, but punishes gay men for engaging in mutually consensual sex couldn't possibly be responsible for an intelligently designed universe.

I may defend your right to free speech, but i won't help you pass out flyers.

Those who can make you believe absurdities, can make you commit atrocities.
--Voltaire

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
(January 31, 2017 at 7:36 pm)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.
The god who allows children to be raped out of respect for the free will choice of the rapist, but punishes gay men for engaging in mutually consensual sex couldn't possibly be responsible for an intelligently designed universe.

I may defend your right to free speech, but i won't help you pass out flyers.

Those who can make you believe absurdities, can make you commit atrocities.
--Voltaire

Nietzsche isn't dead. How do I know he lives? He lives in my mind.
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