@Article{fdmp.2020.07804,
AUTHOR = {Houda Jalali, Hassan Abbassi},
TITLE = {Analysis of the Influence of Viscosity and Thermal Conductivity on Heat Transfer by Al<sub>2</sub>O<sub>3</sub>-Water Nanofluid},
JOURNAL = {Fluid Dynamics \& Materials Processing},
VOLUME = {16},
YEAR = {2020},
NUMBER = {2},
PAGES = {181--198},
URL = {http://www.techscience.com/fdmp/v16n2/38655},
ISSN = {1555-2578},
ABSTRACT = {The addition of nanoparticles into liquid, even at low concentrations, leads to an 
increase in both, dynamic viscosity and thermal conductivity. Furthermore, the increase in 
temperature causes an increase in thermal conductivity and a decrease in the nanofluid 
viscosity. In this context, a numerical investigation of the competition between viscosity 
and thermal conductivity about their effects on heat transfer by Al<sub>2</sub>O<sub>3</sub>-water nanofluid was 
conducted. A numerical study of heat transfer in a square cavity, filled with Al<sub>2</sub>O<sub>3</sub>-water 
nanofluid and heated from the left side, was presented in this paper. Continuity, 
momentum, and thermal energy equations are solved by the finite volume method.
Regarding the pressure-velocity coupling, the SIMPLER algorithm was used. The working 
conditions, allowing the increase of heat transfer, are established. In addition, two 
correlations for viscosity and thermal conductivity of Al<sub>2</sub>O<sub>3</sub>-water nanofluid as functions of 
the concentration and diameter size based on experimental measurement are proposed.
These correlations were more precisely compared to those given by the theoretical models. 
Moreover, other models for viscosity and conductivity depending on temperature are used 
and discussed. The results reveal that heat transfer by Al<sub>2</sub>O<sub>3</sub>-water nanofluid is enhanced 
only when the temperature exceeds 40°C and the diameter size does not exceed a certain 
limit of the order of 45-50 nm depending on temperature.},
DOI = {10.32604/fdmp.2020.07804}
}