Sparkler Combustion: Metal Particle Sparks (2D)

This side-view simulation renders a burning sparkler tip ejecting metal-combustion particles across a 2D plane. Each spark's motion is computed independently from gravity and a drag force proportional to velocity squared relative to the ambient wind, its color follows a blackbody-temperature approximation as it cools, and iron sparks can fork mid-flight the way secondary oxidation fragments real iron droplets. Switch metals, tune ejection rate/speed, wind and lifetime, pan and zoom the view, and tap the tip to give the sparkler a wave.