P A College of Engineering

About: P A College of Engineering is a based out in . It is known for research contribution in the topics: Dihedral angle & Ring (chemistry). The organization has 298 authors who have published 594 publications receiving 4888 citations.

Rheological Behavior and Thermal Conductivity of Graphite–Ethylene Glycol Nanofluid

Abstract: The rheological behavior and thermal conductivity of graphite–ethylene glycol (EG) nanofluid is investigated in this research work. The nanofluid is prepared by two-step method using polyvinylpyrrolidone as surfactant. Volume concentration (vol. %) of 0.2, 0.8, and 2 % graphite-EG nanofluid are prepared by ultrasonicating for 5 h. Initially, the effect of temperature variation from 25°C to 60°C (with a difference of every 2.5°C) on the viscosity of prepared nanofluid for different volume concentrations is studied at a fixed shear rate of 25 s−1. The effect of shear rate from 0.1 to 100 s−1 on the viscosity of nanofluid is tested at a fixed temperature of 25°C. The nanoparticle size considered for analysis of viscosity is <50 nm. Viscoelastic behavior of the nanofluid with respect to change in amplitude and frequency is investigated for 0.2 vol. %. The viscosity analysis is carried out considering graphite nanoparticles of size <50 nm. Later, the thermal conductivity of prepared nanofluid is investigated at a constant temperature (25°C) for nanoparticle sizes of <50 and <100 nm. Finally, from this complete investigation it is concluded that the viscosity of nanofluid increased slightly from 17 to 19 cP with an increase in volume concentration but decreased by 58 % with an increase in temperature. The thermal conductivity for 2 vol. % nanofluid with nanoparticle size <50 nm is found to increase by 16.3 % compared with nanoparticle size <100 nm.

Influence of Heat Treatment and Reinforcements on Tensile Characteristics of Aluminium AA 5083/Silicon Carbide/Fly Ash Composites

Abstract: The effect of reinforcements and thermal exposure on the tensile properties of aluminium AA 5083–silicon carbide (SiC)–fly ash composites were studied in the present work. The specimens were fabricated with varying wt.% of fly ash and silicon carbide and subjected to T6 thermal cycle conditions to enhance the properties through “precipitation hardening”. The analyses of the microstructure and the elemental distribution were carried out using scanning electron microscopic (SEM) images and energy dispersive spectroscopy (EDS). The composite specimens thus subjected to thermal treatment exhibit uniform distribution of the reinforcements, and the energy dispersive spectrum exhibit the presence of Al, Si, Mg, O elements, along with the traces of few other elements. The effects of reinforcements and heat treatment on the tensile properties were investigated through a set of scientifically designed experimental trials. From the investigations, it is observed that the tensile and yield strength increases up to 160 °C, beyond which there is a slight reduction in the tensile and yield strength with an increase in temperature (i.e., 200 °C). Additionally, the % elongation of the composites decreases substantially with the inclusion of the reinforcements and thermal exposure, leading to an increase in stiffness and elastic modulus of the specimens. The improvement in the strength and elastic modulus of the composites is attributed to a number of factors, i.e., the diffusion mechanism, composition of the reinforcements, heat treatment temperatures, and grain refinement. Further, the optimisation studies and ANN modelling validated the experimental outcomes and provided the training models for the test data with the correlation coefficients for interpolating the results for different sets of parameters, thereby facilitating the fabrication of hybrid composite components for various automotive and aerospace applications.