Optimization of Filler Content and Size on Mechanical Performance of Graphene/Hemp/Epoxy-Based Hybrid Composites using Taguchi with ANN Technique L. Natrayan, A. Bhaskar, Pravin P. Patil, S. Kaliappan, M. Dineshkumar, E. S. Esakkiraj Journal of Nanomaterials, 2023 The usage of nanofillers in composite materials has grown over time due to various benefits, including superior properties, better adhesion, and high stiffness. To accomplish this, 150, 200, 250, and 300 gsm of hemp fiber mat with various thicknesses and weight proportions of graphene powder, including 0%, 3%, 6%, and 9%, as well as 3, 6, 18, and 25 µm-sized particles, were used. High-speed mechanical stirring was used to evenly mix the nanofiller (nanographene) with the epoxy-based nanocomposites at various loadings. We looked at the bending and interlaminar shear strength (ILSS) properties of hybrid nanomaterials. According to the study, adding 300 gsm of hemp epoxy composites filled with 6 wt% nanographene has significantly improved mechanical properties. The development of a forecasting model to determine the mechanical properties using artificial neural networks (ANN). The constructed model has a significant connection with the test findings. A correlation of 0.9724 for the Levenberg–Marquardt training procedure indicates a significant connection between the predicted and experimental artificial neural models. The observational and projected results for bending and ILSS have <3% and 4% errors, corresponding to the ANN prediction and Taguchi L16 matrix. The potential of ANN for forecasting the bending and ILSS of composite materials is expanded by the close relationship between ANN and experimental findings. The following parameters were used in the current study to determine the flexural strength: graphene content (40.79%), graphene size (34.19%), the number of hemp layers (12.57%), and hemp fiber thickness (11.65%). Similar to ILSS, graphene content accounts for 47.82% of the total, with graphene size (27.87%), hemp fiber thickness (11.80%), and the number of hemp layers (also 11.80%) all contributing (11.78%).
Experimental and CFD investigation of fully developed flow solar air heater M. Vivekanandan, D. Jagadeesh, A. Natarajan, N. Mohan, M. Dineshkumar Materials Today Proceedings, 2020 The solar air heater is widely used to dry agricultural products such as fruits, vegetables & crops. The problem observed in earlier solar air heater is to develop a fully developed flow inside the casing solar air heater. Being the outlet of the blower is restricted to a small cross-section by the manufacturers, hence providing the trapezoidal-shaped duct is essential. The flow is not fully developed flow inside the casing of SAH. To overcome this problem guide vanes, provided inside the trapezoidal-shaped duct, and that did not solve the problem. Then flow-restricting devices are incorporated inside the duct to make a fully developed flow. Flow restriction devices, also known as perforated plates with various percentage openings. The experiment has been carried to test the solar air heater with and without flow-restricting devices and guide vanes. A velocity reading has been taken across the cross-sectional area of the casing of solar air heater. To validate the experimental results, CFD analysis has been done for the solar air heater. The computational results are good in agreement with the experimental values. Then the solar air heater was analyzed at a different angle of inclination such as 20°, 30°, 40°, 50° & 60°. In all these angle of inclination, the absorber plate material is aluminium. By comparing all these results, 20° inclination angle gives more outlet temperature than the others. Then the absorber plate material is changed to copper, and comparing the copper results with aluminum, aluminum gives more outlet temperature as the aluminum has higher heat holding capacity than the copper.
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Current developments in biotechnology and bioengineering M Seenuvasan, G Sarojini, M Dineshkumar Elsevier , 2020 2020 Citations: 16
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