Leidenfrost temperature: Surface thermal diffusivity and effusivity effect

Droplet impact on hot surfaces results in either droplet-surface contact or non-contact, i.e., the Leidenfrost state. The droplet is levitated upon its vapor, deteriorating heat transfer. temperature depends thermal properties of surface, which are usually characterized by two parameters: diffusivity and effusivity. In this paper, effects these parameters clarified experimentally varying one interest while keeping other constant. experimental indicate that affected effusivity rather than diffusivity; higher is, lower temperature; increase with velocity greater for surface To further understand findings, a theoretical model proposed, considers transient transfer surface. analysis shows scales inverse root square velocity, good agreement results.