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The Leidenfrost effect, where a liquid drop levitates on its vapor, requires a minimum temperature. This study reveals how ambient pressure and temperature influence this Leidenfrost temperature, offering a predictive model.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Thermodynamics

Background:

  • The Leidenfrost effect describes a liquid drop levitating on a hot surface due to its vapor layer.
  • The minimum temperature for this phenomenon, the Leidenfrost temperature (TL), and its influencing factors remain incompletely understood.

Purpose of the Study:

  • To investigate the dependence of the Leidenfrost temperature on ambient pressure and temperature.
  • To develop a predictive model for the Leidenfrost temperature.
  • To elucidate the role of thermal Marangoni flow in the Leidenfrost effect.

Main Methods:

  • Experimental manipulation of ambient pressure and temperature.
  • Measurement of the Leidenfrost temperature for various liquids, including water.
  • Development of a temperature rescaling method to create a master curve.

Main Results:

  • Leidenfrost temperature (TL) increases with increasing ambient pressure and decreases with decreasing pressure.
  • A proposed temperature rescaling collapses data for different liquids onto a single master curve, enabling TL prediction.
  • Increased ambient temperature stabilizes levitating drops at lower temperatures, highlighting the significance of thermal Marangoni flow.

Conclusions:

  • Ambient conditions significantly influence the Leidenfrost temperature.
  • The developed master curve provides a robust tool for predicting the Leidenfrost temperature.
  • Thermal Marangoni flow is crucial for an accurate description of the Leidenfrost effect, though further research is needed.