What are fire dynamics?

Fire Dynamics is the study of how chemistry, fire science, material science and the mechanical engineering disciplines of fluid mechanics and heat transfer interact to influence fire behavior.

Why is fire dynamics important?

Fire dynamics can provide a fire officer or a firefighter with means to understand how a fire will grow and spread within a structure and how best to control that growth.

What are the 4 behaviors of fire?

Fire behavior includes such things as how fast a fire burns (rate of spread), how hot it burns (fire intensity), the presence of fire whirls, and ember production and spotting.

What are the 6 elements of fire?

The six elements of the life cycle of fire are described by Dawson Powell in The Mechanics of Fire. These elements are input heat, fuel, oxygen, proportioning, mixing, and ignition continuity. All of these elements are essential for both the initiation and continuation of the diffusion flame combustion process.

What are the 7 factors that affect fire development?

Rate of burning and heat output for surface and crown fires are influenced by fuel load, fuel moisture, topography, ignition method, air temperature, wind, and relative humidity.

Fire Dynamics in the 21st Century

What are the 5 phases of fire?

What are the three main components of the fire triangle?

Oxygen, heat, and fuel are frequently referred to as the "fire triangle." Add in the fourth element, the chemical reaction, and you actually have a fire "tetrahedron." The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished.

What is chemistry of fire?

Fire is a chemical reaction that converts a fuel and oxygen into carbon dioxide and water. It is an exothermic reaction, in other words, one that produces heat.

What is Class C fire?

A Class C fire is the burning of flammable gases, which can be very dangerous and highly explosive. These include gases such as butane and propane in gas canisters, which you'd expect to find in certain building trades. You will also find these with gas camping stoves and gas barbeques.

What are the 5 different classes of fire PDF?

What are the 5 fire indicators?

Building Factors, Smoke, Air Track, Heat, and Flame (B-SAHF) are critical fire behavior indicators. Understanding the indicators is important, but more important is the ability to integrate these factors in the process of reading the fire as part of size-up and dynamic risk assessment.

What is fire behavior?

Fire behaviour refers to the manner in which fuel ignites, flame develops and fire spreads. In wildland fires, this behaviour is influenced by how fuels (such as needles, leaves and twigs), weather and topography interact.

What is the fire behavior triangle?

The Fire Behavior Triangle. Just like there is a fire triangle, made up of heat, oxygen, and fuel, there is another triangle called the fire behavior triangle. The three legs of this triangle are fuels, weather, and topography. The sections below go more in depth into each of thise and their influence on fire.

What are the fundamentals of fire?

For a fire to occur three things are needed: fuel, oxygen and an ignition source. Without one of these elements, a fire cannot start.

What are the different classes of fire?

What is a fire flow path?

FLOW PATH: The movement of heat and smoke from the fire area (HIGHER. PRESSURE) to towards the lower pressure areas accessible via doors and window openings. Based on varying building configurations, there may be several flow paths within a structure.

What type of fire is Class D?

A Class D fire is characterised by the presence of burning metals. Only certain metals are flammable and examples of combustible metals include sodium, potassium, uranium, lithium, plutonium and calcium, with the most common Class D fires involve magnesium and titanium.

What is DCP fire extinguisher?

DCP extinguishers are sodium bicarbonate and potassium bicarbonate. • DCP extinguishers puts out fire by. coating the fuel surface with chemical powder. • This separates the fuel from the. oxygen in the air and prevent vapor formation.

What type of fire is class B?

Class B: Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering.

What is formula of fire?

Fire is not a chemical, so does not have a formula... You might be after the requirements for burning, in which case those are fuel + oxygen + heat.

What are 3 types of fires?

Is flame matter or energy?

The flame itself is a mixture of gases (vaporized fuel, oxygen, carbon dioxide, carbon monoxide, water vapor, and many other things) and so is matter. The light produced by the flame is energy, not matter. The heat produced is also energy, not matter. Fire changes the nature of substances.

What are the 3 categories of evacuation?

If total evacuation is required in the event of a fire, vertical evacuation is a priority, then horizontal evacuation, and then complete evacuation if necessary.

What backdraft means?

Definition of back draft

: an explosion of the gaseous products of incomplete combustion in admixture with air sometimes occurring during a fire (as in a building or mine)

What are the types of fire extinguisher?

The six main fire extinguisher types are water, foam, CO2, powder, water mist and wet chemical.