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Dynamic Leidenfrost Effect: Relevant Time and Length Scales.

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The Leidenfrost effect occurs when vapor prevents liquid droplet contact with hot surfaces. This study reveals transitional dynamics and scales for the dynamic Leidenfrost temperature during droplet impact.

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Area of Science:

  • Fluid dynamics
  • Heat transfer
  • Surface science

Background:

  • The Leidenfrost effect describes liquid droplet levitation on a hot surface due to vapor generation.
  • The Leidenfrost temperature is the minimum surface temperature for this effect.
  • Dynamic Leidenfrost temperature considers droplet velocity, crucial for impact scenarios.

Purpose of the Study:

  • To investigate the transitional regime between droplet wetting and levitation.
  • To determine the characteristic time and length scales governing the dynamic Leidenfrost temperature.
  • To observe droplet base dynamics during impact on an isothermal surface.

Main Methods:

  • High-speed total internal reflection imaging was employed.
  • Droplet impact dynamics on a smooth sapphire surface were observed.
  • The droplet base was visualized up to 100 nm above the substrate.

Main Results:

  • The study observed the wetting-drying and levitation dynamics of impacting droplets.
  • Transitional processes between full wetting and full levitation were revealed.
  • Characteristic time and length scales influencing the dynamic Leidenfrost temperature were identified.

Conclusions:

  • High-speed imaging provides insight into droplet impact physics.
  • Understanding these scales is key to predicting the dynamic Leidenfrost temperature.
  • This research clarifies droplet behavior at the interface of hot surfaces.