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Leidenfrost droplet jet engine by bubble ejection.

Yukai Lin1, Xiaomin Wu1, Zhifeng Hu1

  • 1Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China.

Journal of Colloid and Interface Science
|July 3, 2023
PubMed
Summary
This summary is machine-generated.

Leidenfrost droplet motion across boiling regimes can exhibit jet-engine-like repulsion on hydrophilic surfaces due to bubble ejection. This phenomenon, influenced by substrate properties, is predictable with a new model.

Keywords:
Boiling regimesBubblesForce analysisLeidenfrost dropletsRepulsive motion

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Area of Science:

  • Fluid dynamics
  • Heat transfer
  • Surface science

Background:

  • Leidenfrost droplet motion is well-studied in its boiling regime.
  • Droplet behavior across diverse boiling regimes, particularly with bubble generation, remains underexplored.
  • Bubbles at the solid-liquid interface can significantly impact Leidenfrost droplet dynamics.

Purpose of the Study:

  • To investigate Leidenfrost droplet motion across different boiling regimes.
  • To explore the influence of bubble generation on droplet dynamics.
  • To identify and characterize novel phenomena in Leidenfrost droplet behavior.

Main Methods:

  • Utilized hydrophilic, hydrophobic, and superhydrophobic substrates with temperature gradients.
  • Studied Leidenfrost droplets of various fluid types, volumes, and velocities.
  • Recorded droplet behaviors across boiling regimes and presented findings in a phase diagram.

Main Results:

  • Observed a jet-engine-like repulsive motion of Leidenfrost droplets on hydrophilic substrates.
  • Attributed the repulsive motion to reverse thrust from bubble ejection during the nucleate boiling regime.
  • Confirmed this phenomenon is absent on hydrophobic and superhydrophobic surfaces.
  • Developed a predictive model for droplet motion, validated against experimental data.

Conclusions:

  • Bubble ejection significantly alters Leidenfrost droplet motion, enabling self-repulsion on hydrophilic surfaces.
  • Substrate properties (hydrophilicity) are critical for observing this repulsive phenomenon.
  • A predictive model successfully captures the complex droplet behaviors across various conditions.