TY - JOUR
T1 - Heat transfer performance of two oil-based nanofluids containing ZnO and MgO nanoparticles
T2 - A comparative experimental investigation
AU - Asadi, Amin
AU - Pourfattah, Farzad
PY - 2019/2
Y1 - 2019/2
N2 - The major objective of the present study is to experimentally investigate the thermophysical properties and heat transfer capability of ZnO- and MgO-engine oil nanofluid as a coolant and lubricant in various engineering applications. The viscosity and thermal conductivity measurements have been performed at different temperatures (ranging from 15 °C to 55 °C) and solid concentrations (ranging from 0.125% to 1.5%). The nanofluids showed Newtonian behavior over the studied range of temperatures, and solid concentrations. Furthermore, the results revealed that the samples containing ZnO cause more increase in the dynamic viscosity compared to the samples containing MgO. The thermal conductivity has also been measured over the same range of temperatures and solid concentrations. The maximum enhancement of just over 28% and 32% at the temperature of 55 °C and the solid concentration of 1.5% has been observed for the ZnO- and MgO-engine oil nanofluid, respectively. Furthermore, the heat transfer performance of the nanofluids has been evaluated based on different figures-of-merit, and it is revealed that using the MgO-engine oil nanofluid is advantageous just in laminar flow regimes while the ZnO-engine oil nanofluid would be advantageous in a limited range of temperatures.
AB - The major objective of the present study is to experimentally investigate the thermophysical properties and heat transfer capability of ZnO- and MgO-engine oil nanofluid as a coolant and lubricant in various engineering applications. The viscosity and thermal conductivity measurements have been performed at different temperatures (ranging from 15 °C to 55 °C) and solid concentrations (ranging from 0.125% to 1.5%). The nanofluids showed Newtonian behavior over the studied range of temperatures, and solid concentrations. Furthermore, the results revealed that the samples containing ZnO cause more increase in the dynamic viscosity compared to the samples containing MgO. The thermal conductivity has also been measured over the same range of temperatures and solid concentrations. The maximum enhancement of just over 28% and 32% at the temperature of 55 °C and the solid concentration of 1.5% has been observed for the ZnO- and MgO-engine oil nanofluid, respectively. Furthermore, the heat transfer performance of the nanofluids has been evaluated based on different figures-of-merit, and it is revealed that using the MgO-engine oil nanofluid is advantageous just in laminar flow regimes while the ZnO-engine oil nanofluid would be advantageous in a limited range of temperatures.
KW - Heat transfer performance
KW - Rheological behavior
KW - Thermal Oil
KW - Thermophysical properties
KW - ZnO and MgO nanoparticles
UR - http://www.scopus.com/inward/record.url?scp=85056665631&partnerID=8YFLogxK
U2 - 10.1016/j.powtec.2018.11.023
DO - 10.1016/j.powtec.2018.11.023
M3 - Journal article
AN - SCOPUS:85056665631
SN - 0032-5910
VL - 343
SP - 296
EP - 308
JO - Powder Technology
JF - Powder Technology
ER -