The Effect of Surface Topography and Wettability on Leidenfrost Effect
When deposited on a superheated surface the droplet can be levitated by its own vapor layer, which is referred to as Leidenfrost effect. This dynamic effect has attracted interests in many potential applications, such as cooling, drag reduction and drop transport. Lots of efforts have been paid on this mechanism over the past two and half centuries. Here, we not only review the classical theories but also present the most recent theoretical advances of Leidenfrost effect. We firstly review the basic theories of Leidenfrost effect that mainly focused on the relationship between drop shape, vapor layer and life time. Then, the shift of Leidenfrost point realized by fabricating special surface textures is introduced and the mechanisms are analyzed. What is more, we will present the reasons of the droplet transport in both Classical Leidenfrost and Pseudo Leidenfrost regime. At last, the promising breakthroughs of Leidenfrost effect are briefly addressed.