What is diffusion in a fire?
In combustion, a diffusion flame is a flame in which the oxidizer and fuel are separated before burning. Contrary to its name, a diffusion flame involves both diffusion and convection processes.
What is an example of a diffusion flame?
The candle flame is a classical example of a diffusion flame. The flame reaches a steady state almost immediately after a match is brought up close to the wick, and if the air in the room is sufficiently still, it does little flickering. The flame basically remains constant in shape and size.
What causes flame?
Fire is the result of applying enough heat to a fuel source, when you’ve got a whole lot of oxygen around. The actual flames of the fire are the release of some of the heat energy as light. These components have led to the development of the ‘fire triangle’ of fuel, oxygen and heat.
Is diffusion a combustion?
Instead, combustion occurs at the contacting surfaces of individual streams of gas and air and proceeds only by molecular interdiffusion. This is “diffusion combustion.
What is turbulent diffusion flame?
Turbulent diffusion flames are excellent flows in which to study the effects of large density differences on turbulence because the density gradients remain large, whereas in ordinary jets and wakes they soon become small.
Can a fire grow?
Once there is a heat source to cause ignition and a sufficient amount of fuel and oxygen present the fire will continue to burn. This transfer of heat causes the fire to grow and to spread to other areas.
What is laminar diffusion flame?
A theoretical description is presented for a laminar diffusion flame spreading against an air stream over a solid- or liquid-fuel bed. The resulting fuel vapor reacts with the oxygen supplied by the incoming air, thereby producing the heat that maintains the flame-spread process.
Is diffusion fast or slow?
Diffusion is a slow process and is not dependent on a system.
Where does diffusion occur?
Diffusion occurs when particles spread. They move from a region where they are in high concentration to a region where they are in low concentration. Diffusion happens when the particles are free to move. This is true in gases and for particles dissolved in solutions – but diffusion does not occur in solids.
Can fire burn itself?
What is Fire? Fire is a chemical process requiring three things to occur: oxygen, fuel and an ignition source. Without one of these factors, a fire can’t start or will burn itself out. In all chemical processes, molecules rearrange themselves and energy is either absorbed or expelled.
What is flux in diffusion?
Diffusion flux. Flux is a vector . The transfer of a physical quantity through a small area with normal per time is where is the inner product and is the little- o notation . If we use the notation of vector area then The dimension of the diffusion flux is [flux] = [quantity]/ ( [time]· [area]).
What is flame effect?
Flame Effect is defined as “The combustion of solids, liquids, or gases to produce thermal, physical, visual, or audible phenomena before an audience.” This includes all flames that are automated, switched, pressurized or having any other action than simply being lit on fire; as well as projects using propane or other liquid or gaseous fuels.
What is flame combustion?
Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel (the reductant) and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke. Combustion in a fire produces a flame, and the heat produced can make combustion self-sustaining.
What is a flame structure?
A flame structure is a type of soft-sediment deformation that forms in unconsolidated sediments. The weight of an overlying bed forces an underlying bed to push up through the overlying bed, generally when both strata are saturated with water. The resulting pattern (in cross section) may resemble flames.