Thermal conductivity and phase-change properties of aqueous alumina nanofluid

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Abstract

This study uses thermal conductivity and differential scanning calorimeter experiments to explore the thermal conductivity and phase-change properties of alumina (Al2O3)-water nanofluid produced using a two-step synthesis method. Deionized water (DW) is used as a control group, and the Al2O3-water nanofluid uses chitosan as a dispersant. Nanoparticle morphology and materials were confirmed using transmission electron microscopy (TEM) and X-ray diffraction (XRD), respectively. The results show that adding Al2O3 nanoparticles to DW improves DW thermal conductivity, but adding chitosan reduces the thermal conductivity of Al 2O3-water nanofluid. Adding the nanoparticles to DW affects the phase-change peak temperature and phase change heat. The optimal combination is 0.1 wt.% chitosan and 0.5 wt.% Al2O3 nanoparticles; the charging phase-change peak temperature and latent heat are 53.4% and 97.8% of those in DW, respectively.

Original languageEnglish
Pages (from-to)369-375
Number of pages7
JournalEnergy Conversion and Management
Volume67
DOIs
Publication statusPublished - 2013 Feb 4

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Keywords

  • Alumina
  • Nanofluid
  • Phase-change heat
  • Phase-change temperature
  • Thermal conductivity

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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