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Leidenfrost Self-Rewetting Drops
Safouene Ouenzerfi1, Souad Harmand1, Jesse Schiffler1
1University of Valenciennes and Hainaut-Cambrésis, LAMIH, UMR CNRS 8201 , Valenciennes , France.
The Journal of Physical Chemistry. B
|April 20, 2018
Summary
Leidenfrost effect allows liquids to levitate on vapor. Self-rewetting fluids reduce vapor film thickness, enhancing heat transfer for high-temperature cooling applications.
Area of Science:
- Physics
- Thermodynamics
- Fluid Dynamics
Background:
- The Leidenfrost phenomenon describes liquid levitation on a hot surface due to vapor pressure.
- This calefaction effect involves vapor injection and drop weight dynamics.
- Surface tension and thermal Marangoni effects influence vapor film thickness and droplet levitation.
Purpose of the Study:
- To investigate the role of surface tension and Marangoni effects in the Leidenfrost phenomenon.
- To explore the potential of self-rewetting fluids for enhanced heat transfer.
- To assess the applicability of these findings in high-temperature mass cooling.
Main Methods:
- Analysis of surface tension magnitude and thermal Marangoni effects.
- Consideration of vapor film dynamics under droplet weight.
- Evaluation of binary mixture fluid properties at high temperatures.
Main Results:
- Standard liquids amplify vapor film thickness and levitation.
- Self-rewetting fluids reduce vapor film thickness.
- Binary mixtures significantly enhance high-temperature heat transfer.
Conclusions:
- Self-rewetting fluids offer improved performance in Leidenfrost-based heat transfer.
- The study provides insights for optimizing high-temperature mass cooling applications.
- Understanding Marangoni effects is crucial for advanced fluid dynamics applications.
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