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Effects of Femtosecond Laser Surface Processed Nanoparticle Layers on Pool Boiling Heat Transfer Performance.

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Femtosecond laser surface processing (FLSP) creates nanoparticle layers on stainless steel, impacting heat transfer. Thicker layers decrease heat transfer coefficients (HTC) due to thermal resistance, suggesting an optimal thickness for enhanced performance.

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Area of Science:

  • Materials Science
  • Heat Transfer Engineering
  • Surface Engineering

Background:

  • Femtosecond laser surface processing (FLSP) creates unique microstructures on materials.
  • Nanoparticle layers can form on surfaces during FLSP, potentially altering thermal properties.
  • Understanding the impact of these nanoparticle layers on heat transfer is crucial for optimizing thermal management.

Purpose of the Study:

  • To experimentally investigate the effect of FLSP-induced nanoparticle layers on pool boiling heat transfer performance.
  • To determine the relationship between nanoparticle layer thickness and heat transfer coefficients (HTC).
  • To characterize the physical and chemical properties of the nanoparticle layers and correlate them with heat transfer behavior.

Main Methods:

  • Fabrication of five stainless steel 304 samples with varying surface features using FLSP.
  • Conducting pool boiling heat transfer experiments to measure HTC for each sample.
  • Utilizing focused ion beam milling and transmission electron microscopy (TEM) for nanoparticle layer characterization.

Main Results:

  • FLSP-induced nanoparticle layers overlaying microstructures can either enhance or degrade HTC.
  • HTC decreased with increasing nanoparticle layer thickness, attributed to added thermal resistance.
  • Characterization revealed physical and chemical properties influencing heat transfer performance.

Conclusions:

  • Nanoparticle layer thickness is a critical factor in pool boiling heat transfer.
  • There exists an optimal nanoparticle layer thickness and composition for enhancing both HTC and critical heat flux (CHF).
  • FLSP offers a method for tailoring surface properties to improve boiling heat transfer.