University of Twente Student Theses


Splashing of Leidenfrost druplets

Geerdink, B. (2013) Splashing of Leidenfrost druplets.

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Abstract:When a droplet impinges on a smooth heated surface, which is heated above the liquid's boiling point, it either comes into contact with the surface (the contact regime), or it is separated from the surface by a vapor layer (the �lm or Leidenfrost regime). Highspeed interferometric imaging is used to make a sharp distinction between both regimes. Increasing the droplet's impact velocity causes the droplet to splash and for each regime this transition to splash is determined experimentally. The transition in the contact regime is found to be at a lower critical Weber number as compared to that of the �lm regime. Both transitions depend on the temperature of the surface and are accounted for theoretically by extending the model from Xu et al. 2005 with the liquid-vapor phase transition. Additionally it is shown that the maximum deformation of a liquid drop, impacting a surface at high temperature, is consistent with the scaling law for the spreading factor
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
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