This paper treats the deformation process of a water droplet impinging on a hot surface above the Leidenfrost temperature. Emphasis is placed on the effects of the kind of surface material and the surface temperature on the deformation process. The surface material used are stainless-steel and silicon. The surface temperature is fixed at 673K and at 773K. It has been found that the time histories of droplet diameter as well as height on two kinds of surfaces are very similar in low Weber numbers such that the droplet rebounds from the surface without disintegration. However, the critical Weber number whether or not the droplet breaks up into some pieces on the surface during deformation has been confirmed to be changeable depending upon the kind of surface material. Furthermore, it has been confirmed that the effect of surface temperature on the droplet deformation process is remarkable in the later deformation period for the case of the low Weber number.

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