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Updated: Dec 23, 2025

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Switchable Wettability for Condensation Heat Transfer.

Jonathan M Ludwicki1, Franklin L Robinson2, Paul H Steen1

  • 1Robert Frederick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States.

ACS Applied Materials & Interfaces
|April 30, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a switchable surface enabling both filmwise and dropwise condensation. This surface doubles heat transfer efficiency in the nonwetting state, offering significant potential for advanced thermal management solutions.

Keywords:
condensationdropsheat transferpolymer brushesstimulus-responsive materialswetting

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Area of Science:

  • Surface science
  • Heat transfer
  • Materials science

Background:

  • Condensation behavior (dropwise vs. filmwise) is dictated by surface wettability.
  • Dropwise condensation typically offers superior heat transfer coefficients compared to filmwise condensation.
  • Controlling surface wettability is crucial for optimizing condensation heat transfer.

Purpose of the Study:

  • To engineer a surface with switchable wettability (superhydrophilic to hydrophobic).
  • To investigate the impact of switchable wettability on condensation modes and heat transfer.
  • To explore the implications for thermal management applications.

Main Methods:

  • Fabrication of a novel surface exhibiting tunable wetting properties.
  • Experimental observation and characterization of condensation modes (dropwise and filmwise).
  • Measurement of heat transfer coefficients for both condensation modes.

Main Results:

  • The developed surface demonstrated switchable superhydrophilic to hydrophobic behavior.
  • Filmwise condensation occurred on the highly wetting (superhydrophilic) surface.
  • Dropwise condensation occurred on the nonwetting (hydrophobic) surface, yielding twice the heat transfer coefficient.

Conclusions:

  • Switchable surfaces can effectively control condensation modes.
  • Harnessing dropwise condensation via switchable surfaces significantly enhances heat transfer.
  • This technology holds promise for improving the efficiency of thermal management systems.