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Effect of Al2O3 phases on the enhancement of thermal conductivity and viscosity of nanofluids in engine oil

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Abstract

Thermal conductivity of α-Al2O3 was measured using hot wire method. α-Al2O3 (20 nm in size) was synthesized by microwave method for which, the results were compared with commercially available γ-Al2O3. Thermal conductivity of nanofluids was investigated considering, it is dependency on Al2O3 phase. It was observed that by adding 3 wt% of nano γ-Al2O3 and α-Al2O3 to the engine oil, thermal conductivity increases by 37 and 31%, respectively. The corresponding viscosity increase for the same amount of nano γ-Al2O3 and α-Al2O3 were 36 and 38%, respectively. It was concluded that the differences in thermal conductivity originate from higher specific surface area of γ-Al2O3 compared to the α-Al2O3 which is the result of porosity difference, obtained during the synthesis process.

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Authors and Affiliations

  1. Renewable Energy Department, Materials and Energy Research Center Tehran, 14155-4777, Tehran, Iran

    Mohammadhassan Vasheghani

  2. Energy Audit Department, Iranian Standard & Quality Inspection Co, No 1847, North Karegar St., Close to Al Ahmad Exp. Way, Tehran, Iran

    Mohammadhassan Vasheghani

  3. Ceramic Department, Materials and Energy Research Center Tehran, 14155-4777, Tehran, Iran

    Ehsan Marzbanrad, Babak Raissi, Toraj Ebadzadeh & Hadi Barzegar-Bafrooei

  4. Electronics Department, University of Barcelona, Barcelona, Spain

    Cyrus Zamani

  5. New Materials Department, Materials and Energy Research Center Tehran, 14155-4777, Tehran, Iran

    Mohamed Aminy

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  1. Mohammadhassan Vasheghani
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  2. Ehsan Marzbanrad
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  3. Cyrus Zamani
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  4. Mohamed Aminy
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  7. Hadi Barzegar-Bafrooei
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Correspondence to Mohammadhassan Vasheghani.

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Vasheghani, M., Marzbanrad, E., Zamani, C. et al. Effect of Al2O3 phases on the enhancement of thermal conductivity and viscosity of nanofluids in engine oil. Heat Mass Transfer 47, 1401–1405 (2011). https://doi.org/10.1007/s00231-011-0806-8

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  • DOI: https://doi.org/10.1007/s00231-011-0806-8

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