Free jet flames

A free jet flame occurs when a fuel vapor, such as natural gas or propane, is released into the open air and ignited, creating a visible flame. It is called "free" because the flame is not confined by a container and can extend outward. These flames are commonly seen in industrial processes, burners, or when gases escape into the atmosphere before burning. The behavior of free jet flames depends on factors like the velocity of the fuel jet, fuel-to-air mixture, and environmental conditions. They are important for understanding combustion efficiency and safety in various applications.