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Nanofluid Boiling on Micro/Nano-engineered Surfaces.

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Boiling nanofluids degrade heat transfer on engineered surfaces, despite moderate critical heat flux improvements. Particle size impacts degradation differently across surfaces, revealing unique mechanisms like clogging and reduced nucleation sites.

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Area of Science:

  • Heat Transfer
  • Nanofluidics
  • Surface Engineering

Background:

  • Engineered surfaces enhance boiling heat transfer, typically with pure water.
  • Nanofluids also show potential for boiling enhancement.
  • The combined effect of engineered surfaces and nanofluids is not well understood.

Purpose of the Study:

  • To investigate the impact of silica (SiO2) nanoparticles on boiling performance of various engineered surfaces.
  • To characterize the degradation mechanisms of heat transfer coefficient (HTC) and critical heat flux (CHF) in nanofluids.
  • To determine the influence of particle size on boiling degradation.

Main Methods:

  • Experimental investigation of boiling aqueous SiO2 nanofluids (7 nm to 10 μm particles, 0.2% volume concentration) on engineered surfaces.
  • Characterization of heat transfer coefficient (HTC) and critical heat flux (CHF).
  • Analysis of degradation mechanisms including nucleation site reduction and thermal insulation.

Main Results:

  • SiO2 nanoparticles moderately improved critical heat flux (CHF) on all tested surfaces.
  • Heat transfer coefficient (HTC) deteriorated with particle addition across all surfaces.
  • Nanoparticle-induced degradation varied by surface type; clogging affected nanostructured and bare copper surfaces, while bi-conductive surfaces showed size-independent degradation.
  • Unique degradation mechanisms, including reduced nucleation sites and thermal insulation, were identified.
  • A partial-CHF condition was observed with particle addition.

Conclusions:

  • The addition of SiO2 nanoparticles to boiling fluids leads to a complex interplay with engineered surfaces, causing HTC degradation.
  • Surface-specific mechanisms dictate the extent and nature of boiling performance decline.
  • While CHF may see moderate gains, overall heat transfer efficiency is compromised, necessitating careful material and fluid selection for enhanced boiling applications.