Room temperature water Leidenfrost droplets

Area of Science:

• Physics
• Fluid Dynamics
• Thermodynamics

Background:

• The Leidenfrost effect, where a liquid droplet levitates on a vapor layer above a surface hotter than its boiling point, is a well-known phenomenon.
• Understanding the factors influencing droplet lifetime and evaporation is crucial for various applications.

Purpose of the Study:

• To experimentally investigate the Leidenfrost effect under reduced pressure conditions.
• To explore the impact of low atmospheric pressure on droplet temperature and lifetime.
• To validate a proposed model for evaporation rate dependence on temperature and pressure.

Main Methods:

• Experimental setup to study the Leidenfrost effect at pressures from 1 to 0.05 atm.
• Measurement of droplet temperature and lifetime at varying pressures.
• Comparison of experimental evaporation rates with a theoretical model.

Main Results:

• Leidenfrost droplets can exist at ambient temperature in a low-pressure environment (0.05 atm).
• Droplet lifetime is significantly extended at reduced pressures.
• Experimental data successfully validated the temperature and pressure dependence of the evaporation rate model.

Conclusions:

• Reduced pressure conditions offer a novel environment for studying the Leidenfrost effect.
• The findings support the potential for efficient Leidenfrost-based micro-fluidic and milli-fluidic devices.
• This research provides a foundation for developing new applications leveraging the extended droplet lifetime at low pressures.