The dynamics of droplet impact on a heated porous surface

•The dynamics of droplet impact on a heated porous surface is studied experimentally.•A new impact regime map together with regime transition criteria is proposed to determine droplet post-impingement behaviour.•Significant differences are found between droplet impact on impermeable surfaces and porous surfaces.•An analytical model with improved boundary layer description is developed to predict maximum spreading.•The maximum-spread model predictions agree well with experiments.