Scientists Discover Why Burning Droplets Bounce Off Cool Surfaces

The phenomenon, driven by a thin air cushion, could lead to advancements in fire safety and engine efficiency.

Researchers at the City University of Hong Kong identified the mechanism behind burning droplets bouncing off cooler surfaces.
The effect is caused by a thin air cushion formed beneath the droplet due to temperature gradients and internal liquid circulation.
Experiments with fuel-like hexadecane droplets revealed that heated and burning droplets bounce, unlike room-temperature ones that stick.
Liquid-repellent coatings on surfaces significantly reduce contact with burning droplets, potentially slowing fire spread and protecting materials.
The findings could improve fuel combustion efficiency in engines and inspire innovations in fire prevention and material safety.