wow i believe that is also a really good representation of back draft. fire burns out its oxygen but still has enough heat and fuel to re-ignite when you take the lid off the pot. great video guys!
the fuel (still there) or the oxygen. The oxygen and the heat are the keys. The temperature is going to drop rapidly as it exits and mixes with outside air. The velocity may be accelerating the the temperature drop. As the fuels mix with the oxygen to the right ratio for flaming, the temperature is likely already fallen to below the autoignition. A follow up might be putting a flame on the smoke vent to see if it is at least at the flame point.
The flash point is defined as the fuel temperature at which the equilibrium fuel vapor concentration of its lower flammability limit is attained. In reality the flash point of a chemical is the lowest temperature where enough fluid can evaporate to form a combustible concentration of gas. It is the lowest temperature of oil at which the application of defined test flames causes the vapors above the surface to ignite and the release of vapors at this temperature is not sufficiently rapid to sustain combustion. The fire point (flame point) is defined as the lowest fuel temperature at which the diffusion flame is sustained longer than 5 s above the fuel pool without any external heat supply. The fire point for engine oils is usually 20-30 higher than flash point. The autoignition temperature or kindling point of a substance is the lowest temperature at which it will spontaneously ignite in a normal atmosphere without an external source of ignition, such as a flame or spark. This temperature is required to supply the activation energy needed for combustion. en.wikipedia.org/wiki/Flash_point en.wikipedia.org/wiki/Fire_point en.m.wikipedia.org/wiki/Autoignition_temperature
hey guys nice video, just make sure the title is correct. It cant be flash and autoignitio point at the same time. atleast you just showed one of them which is autoignition only. Thank you
Even though there is extensive vapor coming out of the pot from about 3:50 onward, it isn't auto igniting. Is this because the smoke is no longer in direct contact with the liquid oil? It seems like it should still be hot enough to auto ignite.
The lack of contact with the liquid isn't really a factor. To have fire, you simply need the right combination of heat, fuel (in this case the smoke gases, aerosols and particulates), and oxygen. The smoke after the 3:50 mark is pushing through a restricted opening with considerable velocity. The smoke is hot, but not quite as hot as the smoke contained inside the pot. So even if we assume the smoke is still hot enough to be above autoignition temp as it leaves the container, we have to look at
It does not always have to be oxygen, chlorine will also support combustion of some things, even nitrogen will support combustion of some things such as magnesium
+Khak Mati I doubt firefighting has any association with pour point. It's more of a concern in colder countries, where oil or diesel loses its flow characteristics and acts like a solid. Some application of concern might be cars, marine vessels operating in harsh cold environments. With the fuel losing its flow characteristics, it might damage car engine or even marine diesel engines.
Wow its awesome bro. But i think there are 3 requirement to make it burn. 1. Oxygen 2. The fuel 3. The fire. These 3 point must be there to make a fire. But why ignition doesnt?
wow i believe that is also a really good representation of back draft. fire burns out its oxygen but still has enough heat and fuel to re-ignite when you take the lid off the pot. great video guys!
Reminds me my first cooking attempts...
Currently studying fire science for firefighter training, this was very helpful!
yea, now I know the differences, thank you!
the fuel (still there) or the oxygen. The oxygen and the heat are the keys. The temperature is going to drop rapidly as it exits and mixes with outside air. The velocity may be accelerating the the temperature drop. As the fuels mix with the oxygen to the right ratio for flaming, the temperature is likely already fallen to below the autoignition. A follow up might be putting a flame on the smoke vent to see if it is at least at the flame point.
Great demonstration. Thanks for upload.
exceptional video with exceptional narration.
currently having risk assessment classes in my last year of civil engineering studies, thanks for this demonstration !!
wow guys i thank u... this is the perfect demonstration... my confusion solved now...
Thank you for uploading
Great demonstration.
Great channel thanks for sharing this my friend!!
Thank you for your beautiful video, very good
The flash point is defined as the fuel temperature at which the equilibrium fuel vapor concentration of its lower flammability limit is attained. In reality the flash point of a chemical is the lowest temperature where enough fluid can evaporate to form a combustible concentration of gas. It is the lowest temperature of oil at which the application of defined test flames causes the vapors above the surface to ignite and the release of vapors at this temperature is not sufficiently rapid to sustain combustion.
The fire point (flame point) is defined as the lowest fuel temperature at which the diffusion flame is sustained longer than 5 s above the fuel pool without any external heat supply. The fire point for engine oils is usually 20-30 higher than flash point.
The autoignition temperature or kindling point of a substance is the lowest temperature at which it will spontaneously ignite in a normal atmosphere without an external source of ignition, such as a flame or spark. This temperature is required to supply the activation energy needed for combustion.
en.wikipedia.org/wiki/Flash_point
en.wikipedia.org/wiki/Fire_point
en.m.wikipedia.org/wiki/Autoignition_temperature
thankyou for explaining this. it's important for student like us to understand
great video! thanks for sharing.
Thx for your upload experiment
Thanks for your video.
Thank you!
hey guys nice video, just make sure the title is correct. It cant be flash and autoignitio point at the same time. atleast you just showed one of them which is autoignition only.
Thank you
Even though there is extensive vapor coming out of the pot from about 3:50 onward, it isn't auto igniting. Is this because the smoke is no longer in direct contact with the liquid oil? It seems like it should still be hot enough to auto ignite.
super great vvideo thanks a lot
Man, that is so cool......
a video is worth a million words...atleast
What did you say it's called with a solid?
"Virolosis"?
At 1:17 - I just couldn't hear properly.
Thank you!
Cheers,
Chris
Pyrolysis
좋은 자료 감사드립니다
Nice
i love de heating thou
what is a flash fire?
Nice.
What Is the exact fluid in there?
..I have heard oil..so..pure olive oil or what? :-) thanks
Anna Ruspa in this case we used off the shelf canola oil. Other oils can be used as well, but may have differing temperatures
The lack of contact with the liquid isn't really a factor. To have fire, you simply need the right combination of heat, fuel (in this case the smoke gases, aerosols and particulates), and oxygen. The smoke after the 3:50 mark is pushing through a restricted opening with considerable velocity. The smoke is hot, but not quite as hot as the smoke contained inside the pot. So even if we assume the smoke is still hot enough to be above autoignition temp as it leaves the container, we have to look at
It does not always have to be oxygen, chlorine will also support combustion of some things, even nitrogen will support combustion of some things such as magnesium
Datang kesini karena Channel rizki. fauzi
Come here because the youtube presentation from rizki. fauzi
thnx
Is anyone can help me to give the information regarding this video, This is gas oil? How much temperature needed to auto ignition?
Thank you
Every liquid substance has it's own flash point fire point and auto ignition.
what is the name of the liquid used?
he said canola oil in the beginning.
I want to know about pour point
please
+Khak Mati I doubt firefighting has any association with pour point. It's more of a concern in colder countries, where oil or diesel loses its flow characteristics and acts like a solid. Some application of concern might be cars, marine vessels operating in harsh cold environments. With the fuel losing its flow characteristics, it might damage car engine or even marine diesel engines.
Thanks TH-cam Algorithm
Wow its awesome bro. But i think there are 3 requirement to make it burn.
1. Oxygen
2. The fuel
3. The fire.
These 3 point must be there to make a fire. But why ignition doesnt?
needed chain reaction.
Just put water on it.... And you'll discover it's possible to have a 4th degree burn.
ONLINE CLASS ANYONE?