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Related Experiment Video

Updated: Mar 3, 2026

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns.

Sujith Kumar C S1, Yao Wen Chang1, Ping-Hei Chen2

  • 1Department of Mechanical Engineering, National Taiwan University.

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|April 28, 2017
PubMed
Summary

This study enhanced heat transfer using hybrid wettable patterns on copper surfaces. Optimizing the number and orientation of these patterns significantly improved the heat-transfer coefficient (HTC) by controlling bubble dynamics.

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Area of Science:

  • Materials Science
  • Heat Transfer Engineering
  • Surface Science

Background:

  • Pool-boiling heat transfer is crucial in many industrial applications.
  • Surface wettability plays a significant role in enhancing boiling performance.
  • Hybrid wettable surfaces offer potential for improved heat transfer characteristics.

Purpose of the Study:

  • To investigate the impact of interline number and orientation on pool-boiling heat transfer.
  • To evaluate the performance of hybrid wettable patterns on cylindrical copper surfaces.
  • To understand the relationship between surface characteristics, bubble dynamics, and heat transfer.

Main Methods:

  • Fabrication of hybrid wettable patterns by coating superhydrophilic SiO2 on hydrophobic copper surfaces.
  • Pool-boiling heat-transfer experiments using de-ionized water on treated copper cylinders (25-mm diameter, 40-mm length).
  • Analysis of heat-transfer coefficient (HTC) and visualization of bubble formation using a CCD camera.

Main Results:

  • Increasing the number of interlines enhanced the HTC compared to plain surfaces.
  • Bubble formation was more prevalent on the interlines.
  • The hybrid wettable pattern with a hydrophobic lowermost section yielded the best HTC.

Conclusions:

  • Both the number and orientation of hybrid wettable patterns significantly influence wall superheat and HTC.
  • Bubble dynamics on the surface are a critical factor determining nucleate boiling efficiency.
  • Optimized hybrid wettable patterns show promise for enhancing pool-boiling heat transfer.