Abstract
Abstract When liquid drops impinge on a wall heated up above the boiling temperature of the liquid, bubbling and convection are observed in the emerging film which spreads along the wall. Experimental investigations of these processes and of the connected evaporation of the liquid are aimed at an improved understanding of the underlying mechanisms important for many technical applications. Typical Weber numbers of the impinging drops were varied between 50 and 700, the temperature of the polished aluminium wall between 70°C and 400°C, i.e., above the boiling temperature of ethanol used in the experiments. The growth rate of bubbles, their maximum diameter and their collapse as well as the formation and destruction of convection cells in the liquid film were recorded and analysed.
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