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Enhanced Phase-Change Heat Transfer by Surface Wettability Control.

Lei Zhou1, Wen He2, Miao Wang3

  • 1Department of Physics, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Materials Research, Jiujiang Research Institute, College of Physical Science and Technology, Xiamen University, Xiamen, 361005, P. R. China.

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Summary

This study introduces a novel carbon nanotube surface that dynamically switches wettability for enhanced heat transfer. This smart surface significantly boosts both boiling and condensation heat exchange in integrated devices.

Keywords:
carbon nanotubesheat transfersuperhydrophilicitysuperhydrophobicitywettability

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Heat Transfer Engineering

Background:

  • Micro-nanostructure surfaces significantly enhance phase-change heat transfer.
  • Intelligent devices require adaptable heat exchange surfaces for diverse environmental conditions.
  • Controlling surface wettability is key to optimizing heat transfer processes.

Purpose of the Study:

  • To design a carbon nanotube array-based surface with switchable wettability (superhydrophobic/superhydrophilic).
  • To integrate this surface into a device for combined boiling and condensation heat transfer.
  • To demonstrate independent adjustment of surface wettability for specific heat transfer requirements.

Main Methods:

  • Fabrication of carbon nanotube arrays on surfaces.
  • Characterization of surface wettability switching capabilities.
  • Integration of the smart surface into a device combining boiling and condensation heat transfer.

Main Results:

  • Achieved over 90% enhancement in condensation heat transfer in the superhydrophobic state.
  • Achieved over 41% enhancement in boiling heat transfer in the superhydrophilic state.
  • Demonstrated independent control over heat transfer modes via wettability switching.

Conclusions:

  • Surfaces with controllable wettability offer a pathway to advanced thermal management.
  • This technology enables active regulation of system and device temperatures.
  • The developed carbon nanotube surface is a promising component for next-generation smart control technologies.