TY - JOUR
T1 - An experimental and theoretical investigation on heat transfer capability of Mg (OH)2/MWCNT-engine oil hybrid nano-lubricant adopted as a coolant and lubricant fluid
AU - Asadi, Amin
AU - Asadi, Meisam
AU - Rezaniakolaei, Alireza
AU - Rosendahl, Lasse Aistrup
AU - Wongwises, Somchai
PY - 2018/1
Y1 - 2018/1
N2 - The major objective of the present study is to investigate the heat transfer capability of Mg (OH)2/MWCNT- engine oil hybrid nano-lubricant. First, the effects of temperature and Solid volume fraction on the dynamic viscosity and thermal conductivity of Mg (OH)2/MWCNT- engine oil hybrid nano-lubricant have been experimentally investigated. The experiments have been conducted in various temperatures (25 °C, 30 °C, 35 °C, 40 °C, 45 °C, 50 °C, 55 °C, and 60 °C) and solid concentrations (0.25%, 0.5%, 0.75%, 1%, 1.5%, and 2%). Based on the measurements, it is found that the studied nano-lubricant showed Newtonian behavior in all the studied temperatures and solid concentrations. Furthermore, the experimental results indicated that the dynamic viscosity of the nano-lubricant increases with an increase in solid concentration while it decreases with an increase in temperature. The thermal conductivity of the nanofluid showed increasing trend as the solid concentration and temperature increased. The minimum and maximum enhancement were about 13% and 50%, respectively. Based on experimental data, two new trustworthy correlations to predict the dynamic viscosity and thermal conductivity of the nano-lubricant has been proposed. Finally, the heat transfer capability of the nanofluid has been theoretically investigated in both the internal laminar and turbulent flow regimes and it is found that the studied nanofluid can be advantageous in heat transfer applications.
AB - The major objective of the present study is to investigate the heat transfer capability of Mg (OH)2/MWCNT- engine oil hybrid nano-lubricant. First, the effects of temperature and Solid volume fraction on the dynamic viscosity and thermal conductivity of Mg (OH)2/MWCNT- engine oil hybrid nano-lubricant have been experimentally investigated. The experiments have been conducted in various temperatures (25 °C, 30 °C, 35 °C, 40 °C, 45 °C, 50 °C, 55 °C, and 60 °C) and solid concentrations (0.25%, 0.5%, 0.75%, 1%, 1.5%, and 2%). Based on the measurements, it is found that the studied nano-lubricant showed Newtonian behavior in all the studied temperatures and solid concentrations. Furthermore, the experimental results indicated that the dynamic viscosity of the nano-lubricant increases with an increase in solid concentration while it decreases with an increase in temperature. The thermal conductivity of the nanofluid showed increasing trend as the solid concentration and temperature increased. The minimum and maximum enhancement were about 13% and 50%, respectively. Based on experimental data, two new trustworthy correlations to predict the dynamic viscosity and thermal conductivity of the nano-lubricant has been proposed. Finally, the heat transfer capability of the nanofluid has been theoretically investigated in both the internal laminar and turbulent flow regimes and it is found that the studied nanofluid can be advantageous in heat transfer applications.
KW - Heat transfer capability
KW - Thermal conductivity
KW - Dynamic viscosity
KW - Solid concentration
KW - Temperature
KW - New correlation
KW - New correlations
UR - http://www.scopus.com/inward/record.url?scp=85032857425&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2017.10.074
DO - 10.1016/j.applthermaleng.2017.10.074
M3 - Journal article
SN - 1359-4311
VL - 129
SP - 577
EP - 586
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
ER -