ABSTRACT
Moreover, for a completely burned mixture exiting the combustion chamber, the fuel, air and products of combustion must interdiffuse to form a uniform mixture. The process of combustion in these situations is called a diffusion flame or a non-premixed flame. This chapter presents cases that introduce the reader to some of the main concepts involved in diffusion flames. If there is no ignition source and all temperatures are below the autoignition temperature, no flame will occur. The diffusion flame situation may be set up with a simple Bunsen burner in the laboratory just by cutting off the air supply. The spherical flame is almost never present in any real combustion situation. The surrounding flame at high temperature is now the driving force for heat transport towards the drop, and the outward mass transport is driven by the fuel vapor mass fraction gradient between the droplet surface and the flame.
