Inflamed Leidenfrost drops

In the classical Leidenfrost framework, the top evaporation of levitating drops is typically ignored, yet combustion redefines the evaporation dynamics for inflamed Leidenfrost drops. This work shows that inflamed Leidenfrost drops burn much longer than those in sub-Leidenfrost states, with evaporation split into independent bottom and top parts. Bottom evaporation dominates---especially for large drops---while the temperature-independent top rate reflects the intrinsic burn rate at saturation temperature. These findings challenge fire suppression strategies by highlighting the prolonged fuel lifetime in the Leidenfrost state and offer a boundary-free method to measure intrinsic burning rates.