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

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Pool boiling of nanoparticle-modified surface with interlaced wettability.

Chin-Chi Hsu1, Tsung-Wen Su, Ping-Hei Chen

  • 1Department of Mechanical Engineering, National Taiwan University, No, 1, Sec, 4, Roosevelt Rd, Taipei, 10617, Taiwan. phchen@ntu.edu.tw.

Nanoscale Research Letters
|May 22, 2012
PubMed
Summary

Altering surface wettability with nano-silica particles enhances critical heat flux during pool boiling. Interlaced wettability, even with small contact angle differences, consistently outperforms uniform surfaces for better heat transfer.

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Area of Science:

  • Heat Transfer
  • Surface Science
  • Nanotechnology

Background:

  • Pool boiling is a crucial heat transfer mechanism in many industrial applications.
  • Surface wettability significantly influences boiling performance, particularly critical heat flux (CHF).
  • Understanding how to manipulate surface properties for enhanced heat transfer is an ongoing research area.

Purpose of the Study:

  • To investigate the effect of interlaced wettability on pool boiling heat transfer.
  • To explore the role of nano-silica particles in modifying surface wettability.
  • To determine the relationship between surface wettability patterns and critical heat flux.

Main Methods:

  • Fabrication of heating surfaces with varying interlaced wettability using nano-silica particle coatings.
  • Experimental measurement of pool boiling heat transfer performance.
  • Analysis of critical heat flux under different wettability conditions.

Main Results:

  • Uniformly wettable surfaces show increased critical heat flux with higher wettability.
  • Interlaced wettability surfaces consistently exhibit higher critical heat flux than isotropic surfaces.
  • Smaller contact angle differences between surface regions lead to higher critical heat flux.

Conclusions:

  • Interlaced surface wettability is a highly effective strategy for enhancing critical heat flux in pool boiling.
  • Nano-silica particle coatings provide a viable method for creating such surfaces.
  • Optimizing the wettability contrast is key to maximizing heat transfer enhancement.