difusioonipõlevad

Difusioonipõlevad refers to a type of combustion process where the reaction rate is limited by the rate at which fuel and oxidizer diffuse and mix. In this regime, the chemical reaction is very fast, so the flame exists only in the region where the fuel and oxidizer meet. This is in contrast to kinetically controlled combustion, where the reaction rate is the limiting factor and the flame can spread even if fuel and oxidizer are not perfectly mixed.

Difusioonipõlevad is common in many real-world scenarios, such as candle flames, oil lamps, and the burning of many gases in open air. In a candle flame, for example, the wax vaporizes, diffuses upwards, and mixes with the surrounding air, which provides the oxygen for combustion. The flame zone is a thin layer where this mixing occurs. The shape and stability of a diffusion flame are heavily influenced by factors like the flow rates of the fuel and oxidizer, temperature, and pressure.

Understanding difusioonipõlevad is crucial for designing and analyzing various combustion systems, including engines, furnaces, and burners. It helps in predicting flame structure, heat release rates, and pollutant formation. For instance, inefficient mixing in a diffusion flame can lead to incomplete combustion and the production of soot and other harmful byproducts. Research in this area often focuses on enhancing mixing to achieve more complete and efficient combustion.