The effect of alumina/water nanofluid particle size on thermal conductivity

Tun Ping Teng*, Yi Hsuan Hung, Tun Chien Teng, Huai En Mo, How Gao Hsu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

401 Citations (Scopus)


This study examines the effect of particle size, temperature, and weight fraction on the thermal conductivity ratio of alumina(Al2O 3)/water nanofluids. A Al2O3/water nanofluid produced by the direct synthesis method served as the experimental sample, and nanoparticles, each of a different nominal diameter (20, 50, and 100 nm), were dispersed into four different concentrations (0.5, 1.0, 1.5, and 2.0 wt%). This experiment measured the thermal conductivity of nanofluids with different particle sizes, weight fractions, and working temperatures (10, 30, 50 °C). The results showed a correlation between high thermal conductivity ratios and enhanced sensitivity, and small nanoparticle size and higher temperature. This research utilized experimental data to construct a new empirical equation, taking the nanoparticle size, temperature, and lower weight fraction of the nanofluid into consideration. Comparing the regression results with the experimental values, the margin of error was within -3.5% to +2.7%. The proposed empirical equation showed reasonably good agreement with our experimental results.

Original languageEnglish
Pages (from-to)2213-2218
Number of pages6
JournalApplied Thermal Engineering
Issue number14-15
Publication statusPublished - 2010 Oct


  • Nanofluid
  • Particle size
  • Thermal conductivity

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering


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