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The Effect of Channel Surface Roughness on Two–Phase Flow Patterns: A Review

Author

Listed:
  • Małgorzata Sikora

    (Faculty of Mechanical Engineering and Energy, Koszalin University of Technology, 75-620 Koszalin, Poland)

  • Tadeusz Bohdal

    (Faculty of Mechanical Engineering and Energy, Koszalin University of Technology, 75-620 Koszalin, Poland)

  • Katarzyna Tandecka

    (Faculty of Mechanical Engineering and Energy, Koszalin University of Technology, 75-620 Koszalin, Poland)

  • Wojciech Kacalak

    (Faculty of Mechanical Engineering and Energy, Koszalin University of Technology, 75-620 Koszalin, Poland)

  • Thomas G. Mathia

    (Laboratoire de Tribologie et Dynamique des Systemes (LTDS), Ecole Centrale de Lyon, Centre National de la Recherche Scientifique, 69134 Lyon, France)

Abstract

This review article highlights the critical impact of surface roughness in modifying the structure of two-phase flow within mini- and microchannels, particularly in processes such as boiling and condensation. Channel surface roughness enhances flow resistance, affects the distribution of vapor bubbles, and enhances heat transfer by providing additional nucleation sites. Several experiments have shown that while increased surface roughness enhances the efficiency of heat transfer, increased flow resistance may hurt system performance. This is so because too high a surface roughness negatively impacts flow resistance, a factor of importance in the optimization for a balance between heat transfer and flow resistance, especially in high-performance compact heat exchangers. Furthermore, the review identifies that higher-degree measurement and characterization techniques of the surface roughness are increasingly required, as traditional 2D parameters may not fully represent the actual physics of complex surface interactions in two-phase flow systems. Consequently, the article calls for further research that can examine the exact relationship between roughness, flow structure, and thermal performance with the aim of improving design strategies for future heat exchanger technologies.

Suggested Citation

  • Małgorzata Sikora & Tadeusz Bohdal & Katarzyna Tandecka & Wojciech Kacalak & Thomas G. Mathia, 2024. "The Effect of Channel Surface Roughness on Two–Phase Flow Patterns: A Review," Energies, MDPI, vol. 17(21), pages 1-26, November.
  • Handle: RePEc:gam:jeners:v:17:y:2024:i:21:p:5483-:d:1512426
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