In this research, the friction and wear of AA7075 nanocomposites reinforced with graphene and graphite were studied. Graphene’s inclusion dramatically enhanced the material’s mechanical characteristics, friction, and wear resistance. AA7075 is strengthened with less graphene, and AA7075, reinforced with more graphite, exhibits similar wear and friction behavior. Wear rate and coefficient of friction predictions for AA7075-graphene nanocomposites were made using five machine learning (ML) regression models. ML simulations reveal that the wear and friction of AA7075-graphene composites are most sensitive to the proportion of graphene presence, the loadings, and the hardness.
Solar distillation is an economical and nature-friendly method used for the product of fresh water from the (mixing of salt water and fresh water) brackish water. Solar still performance depends mainly on the absorber plate conditions. Since all the solar radiation is mainly absorbed by the basin plate and the water present in the basin. In this experimental work, the performance of the basin plate is enhanced by using diverse basin plate configurations with energy storing materials like mild steel, black gravel, pebbles, sand, and cast iron. The basin plates and the energy storing materials increase the evaporation area and it will store the high heat during the sunshine hours and emitted the stored energy during the off shine hours to the system enhances the still productivity in the less solar radiations too. Here, the comparison has been made between the energy storing materials with flat absorber plate to the trapezoidal and the pin fin absorber plate with similar conditions. Through this experimentation process, we could conclude that trapezoidal basin plate with varied energy storing materials plays a predominant role in the production of distilled water than the flat and pin fin basin plates. On the other hand, black gravel gives good productive results compared to other energy storing materials used in this experiment for all basin plates. This will show the fulfilment of the basin plate and the productivity could be enhanced with different configurations of basin plates as well as incorporation of different energy repository materials
This study focused on the production of biodiesel using avocado seed oil (ASO) through esterification of free fatty acids (FFA) in the presence of carbon supported CuO nanoparticles (CuO/C). ASO was obtained using hexane as a solvent by Soxhlet extraction. Further characterization of ASO revealed that the oil had 8.2-10.2% (±0.2%) of FFA content. Using a two-step technique, the FFA content was decreased below 1% through esterification using a catalyst prepared from carbon supported nanoparticles of CuO. Additionally, CuO/C catalyst was characterized by different techniques, such as XRD and BET. From the investigations, the optimal time for the esterification process was found to be 6 h at 673 K. The use of carbon supported CuO nanoparticle for the transesterification process of ASO has not been attempted in earlier. Also, the studies on FFA present in the avocado seed oil had a significant outcome in this investigation. Further, the data observed from the reactions conducted at different temperatures were subjected for kinetic analysis to determine the reaction rate and thermodynamic study for activation energy.
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