What is a cold flame?
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The Zabetakis formula for calculating the upper limit from the lower limit, L_upper = 6.5 × L_lower^(1/2), is applicable under the condition that \"there is no cold flame involved\". Could someone please help explain what a “cold flame” is?
Hearing about it for the first time. Is it this: Cold fireworks are fireworks that produce a cool, smoke-free flame; they are made from metal powders with a low ignition point, which are processed in certain proportions. These fireworks have a low ignition point, ranging from 60°C to 80°C, and the external temperature is between 30°C and 50°C, so they pose no harm to humans. Suitable for stage performances and various styling designs. (The ignition temperature of ordinary fireworks ranges from 800°C to 1200°C, and they can easily cause harm to the human body when burning.) ) Cold-flame fireworks have a high level of technological sophistication, and are highly favored by people for being environmentally friendly and pollution-free.
2# siena2008 The person is asking about “flames”~~ What you’re referring to here are “fireworks”~~~ Fireworks are things for kids to play with~~~
2# siena2008 I’m not sure if this explanation is correct either, but it doesn’t seem to be the right way to understand it. I think it might be related to the process of material combustion, such as factors like whether the products dissociate or not; it’s hard to say for sure. Anyway, thanks for your answer; I learned something new too!
Is it that the energy released when a substance burns is not high, meaning that the heat emitted by the flame is less than the heat radiated when other substances burn?
Without such a flame, although white phosphorus catches fire at 40 degrees, the temperature of the flame during spontaneous combustion reaches 300 degrees. Combustion is a process of intense energy release that necessarily involves significant heat emission; the so-called cold flame does not exist, at least not among the materials known to humanity to date!
I read a paper that mentioned the term “cold flame reaction”. It relates to the compression and combustion processes in an engine cycle. In general, at low temperatures, the engine may not experience combustion during each compression cycle; however, if no combustion occurs, the compressed gas mixture can produce active molecules, which makes combustion more likely to occur during subsequent compressions. This process in which no combustion occurs but an activated state of molecules prior to combustion is produced is known as a cold flame reaction (this is my own understanding based on the text). In the next cycle following this cold-flame reaction, the combustion delay period will be reduced, meaning that combustion becomes easier.