Prediction and modeling of MWCNT/Carbon (60/40)/SAE 10 W 40/SAE 85 W 90(50/50) nanofluid viscosity using artificial neural network (ANN) and self-organizing map (SOM)

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 × 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.