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Droplet impact on hot surfaces is widely encountered in industry and  engineering applications. In the present paper we investigate the effect of  the combination of the droplet liquid type and the solid surface type and  their effect on droplet impact dynamics. We test three surfaces, copper 110,  aluminum 1199 and stainless steel 304, and two liquids, water and ethanol.  These surfaces and liquids are characterized by high and low thermophysical  properties. The three surfaces are tested with water to investigate the  effect of the surface on the droplet dynamics. After that, we test both  liquids with aluminum. Our findings showed that the Leidenfrost temperature  does not always correlate with the surface thermal properties as reported in  the literature. Some surfaces can undergo changes because of the heating and  this reduces their initial thermal properties. For this reason, such  surfaces are capable to show two Leidenfrost temperatures because of the  thermophysical properties reduction during heating. Our findings also  revealed that the Leidenfrost temperature of liquids with low thermophysical  properties including surface tension, evaporation latent heat and density  show trivial effect by the droplet impact velocity; i.e. the Leidenfrost  temperature show trivial increase by increasing the droplet impact velocity.  Liquids with high thermophysical properties show significant Leidenfrost  temperature increase by increasing the impacting velocity.

Experimental study on the effect of the liquid/surface thermal properties on droplet impact