Secondary droplet atomization from single drop impact on heated surfaces

The paper reports an experimental analysis of impact of single drops on a solid heated surface at different temperatures, so as to consider different heat exchange regimes from nucleate boiling to film boiling. Secondary drops produced after impact were characterised by measuring size and velocity both using PDA and the analysis of high resolution images (IAT). Two impacting walls with different surface roughness were used to show the effect of this parameter on different atomisation regimes. Image analysis allowed also to define the details of the morphology of drop spreading and break-up.