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Related Experiment Video

Updated: Feb 8, 2026

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Origin, Evolution, and Movement of Microlayer in Pool Boiling.

An Zou1, Manish Gupta1, Shalabh C Maroo1

  • 1Department of Mechanical and Aerospace Engineering , Syracuse University , Syracuse , New York 13244 , United States.

The Journal of Physical Chemistry Letters
|June 26, 2018
PubMed
Summary
This summary is machine-generated.

Boiling bubbles initially form with a fully wetted base, challenging existing theories. This wetted bubble base phenomenon depends on liquid-solid interactions during pool boiling.

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Area of Science:

  • Fluid dynamics
  • Heat transfer
  • Surface science

Background:

  • Pool boiling is a crucial heat transfer mechanism.
  • Understanding bubble dynamics, including the microlayer thin film, is key to optimizing heat transfer.
  • Current models often assume a three-phase contact line dictates bubble origin.

Purpose of the Study:

  • To visualize the microlayer thin film in situ during pool boiling.
  • To investigate the initial formation of vapor bubbles on different surfaces.
  • To characterize the drying process and contact line movement.

Main Methods:

  • In situ visualization of the microlayer thin film within vapor bubbles during pool boiling.
  • Experimental determination of bubble base behavior on hydrophilic and hydrophobic surfaces.
  • Analysis of curvature changes and energy requirements for bubble movement.

Main Results:

  • Bubbles originate with a completely wetted base, lacking a three-phase contact line, on both hydrophilic and hydrophobic surfaces.
  • The wetted bubble base phenomenon is dependent on liquid-solid interactions.
  • A cyclical behavior in microlayer curvature, termed "dryout viscosity," occurs during the drying process.
  • The energy required for contact line unpinning and movement was defined.

Conclusions:

  • The initial formation of vapor bubbles during pool boiling deviates from established theories.
  • Liquid-solid interactions significantly influence the presence of a wetted bubble base.
  • The study provides new insights into the complex dynamics of the microlayer during bubble growth and detachment.