Abstract
The effect of surface characteristics on the evaporation time of a single water droplet was studied. The evaporation lifetime curve for a water droplet was measured at a surface temperature up to 500℃. The results showed that the Leidenfrost point (LEP) was not sensitive to surface roughness. It slightly increases with increasing surface roughness of surfaces with arithmetic average surface roughness values of 50∿2000nm. The LFP of a Teflon-coated brass surface was up to 60-70℃ compared with a brass surface. The Leidenfrost film boiling of a water droplet on heated surface which was coated with a diecast releasing agent cannot exist in this experiment. When a water droplet dropped onto a wire netting-set surface, a water droplet evaporated rapidly at even higher temperatures over 400℃.
