The present study investigated and predicted the relative viscosity of multiwall carbon nanotube/carbon (60/40)/SAE 10 W
40/(Society of Automotive Engineers) SAE 85 W 90(50/50) at different temperatures and the different volumetric fraction
by applying artificial neural networks based on experimental data. Several samples of nanofluid were provided by adding
nanoparticles in 0%, 0.1%, 0.3%, 0.5%, 0.8% and 1% volumetric concentrations. Dynamic viscosity of the nanofluid was
measured in the temperature range of 25–50 C. Initially, a self-organizing 6 9 6 hexagonal network was used. A total of
36 neurons were chosen. The winner neuron was neuron 25, having assigned the most data to itself. Then 25 neurons were
used for the neural network, which had a very good performance. Temperature and concentration were considered as input
variables, while the relative viscosity was the output parameter of the neural network. Mean-square error, correlation
coefficient and standard deviation were utilized in order to assess the results. Based on the obtained results, the best model
was double-layer perceptron neural network with 25 neurons. The mean square error, correlation coefficient and standard
deviation were equal to 2.0193e-008, 1 and 0.00021082, respectively. Therefore, the model is able to predict relative
viscosity with appropriate accuracy.
