Effect of Al2O3 phases on the enhancement of thermal conductivity and viscosity of nanofluids in engine oil |
| |
| Authors: | Mohammadhassan Vasheghani Ehsan Marzbanrad Cyrus Zamani Mohamed Aminy Babak Raissi Toraj Ebadzadeh Hadi Barzegar-Bafrooei |
| |
| Affiliation: | (1) Renewable Energy Department, Materials and Energy Research Center Tehran, 14155-4777 Tehran, Iran;(2) Energy Audit Department, Iranian Standard & Quality Inspection Co, No 1847, North Karegar St., Close to Al Ahmad Exp. Way, Tehran, Iran;(3) Ceramic Department, Materials and Energy Research Center Tehran, 14155-4777 Tehran, Iran;(4) Electronics Department, University of Barcelona, Barcelona, Spain;(5) New Materials Department, Materials and Energy Research Center Tehran, 14155-4777 Tehran, Iran |
| |
| 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. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
