Thermal Analysis of Ni-Cu Alloy Nanocomposites Processed by Sand Mold Casting J. Kumaraswamy, Vidyasagar Shetty, S. Sanman, Premkumar Naik, Shabari Shedthi, C. Gnanavel, and Ibsa Neme Mogose Hindawi Limited Ni-Cu based alloy metal matrix nanocomposites are in great demand for advanced technological applications due to their high temperature, strength, and better thermal properties. The aim is to investigate the thermal conductivity and coefficient of thermal expansion of the nickel based alloy nanocomposites reinforced with titanium dioxide (TiO2) which varies from 3 to 12 weight % nanoparticulates (45 to 60 nm). The thermal conductivity was measured using a comparative cut bar method (ASTM E1225), and thermal expansion was analyzed using a push-rod dilatometer method (ASTM E228). From experimentation, it was observed that thermal conductivity of the nanocomposites activity increases with inclusion of the nanoparticles up to 9 weight % after descent due to the temperature effects in nanocomposites, and thermal expansion of the nanocomposites decreases with addition of the nanoparticles up to 9 weight % and further rises marginally due to ductility of composites. Due to the incorporation of hard ceramic particles into the matrix, the composites’ thermal conductivity increases to 57.42 W/m ℃ , and their thermal expansion decreases to 12 × 10−6. Nickel alloys are widely used in marine, automotive, valve, pump, and aircraft applications.
Structural and optical behavior of SnS<inf>2</inf>/NiFe<inf>2</inf>O<inf>4</inf> NCs prepared via novel two-step synthesis approach for MB and RhB dye degradation under sun light irradiation K. S. Ashraff Ali, V. Mohanavel, C. Gnanavel, V. Vijayan, and N. Senthilkumar Springer Science and Business Media LLC The present investigation focuses on facile two-step synthesis approach fabrication of tin sulfide (SnS2)/ nickel ferrite (NiFe2O4) nanocomposites (NCs) for the first time. The crystallinity and phase purity of the prepared material was investigated in powder X-ray diffraction (PXRD) studies. The presence of functional groups (stretching and bending vibration) was primarily determined by the Fourier Transform Infrared Spectroscopy (FT-IR) analysis. As well as, optical behavior of the synthesized samples was determined in UV–Vis absorption spectroscopic studies, and the presence of surface defects was established by PL spectroscopic studies. From the FESEM analysis, sponge-like structure was attained and Ni, Fe, Sn, S and O elemental component was determined by the EDAX spectrum analysis. The as-prepared SnS2/NiFe2O4 NCs exhibit superior photocatalytic performance and high stability toward the reduction of methylene blue (MB) and rhodamine B (RhB) dyes under irradiation of direct sunlight. The synthesized nanocomposites showed an efficient photocatalytic activity with a high reaction kinetic rate.
Investigation of appropriateness of coated steel piston for aluminium alloy piston for small engines C. Gnanavel, R. Saravanan, and M. Chandrasekaran Informa UK Limited ABSTRACT Materials substitution is an imperative research area. The aim of this research is cost reduction, improved performance on its physical, chemical or mechanical properties like improved strength, reduced weight or in terms of performances. The objective of this paper is to investigate the possibilities to use the steel piston in place of the aluminium alloy piston for small engine applications like portable generator. Aluminium alloy piston, uncoated steel piston, nickel-coated steel piston and hard chrome-coated steel piston are considered. Steel pistons plated had standard thickness and were physically experimented. The thermal analysis like thermal deformation, total and directional heat flux analysis were carried out in ANSYS software. For the outperformed piston, the CFD analyses on contoured particles were carried out with help of ANSYS Fluent software. The CFD analysis on contoured particles includes the static pressure, velocity as well as directional velocity components and path line of contoured particles.
SPM is a right choice for improving quality and reliability and reduction of cost and manufacturing time-A case study R. Saravanan and C. Gnanavel Elsevier BV Abstract In the manufacturing, even though the machine centers have sophisticated machines for meeting the necessary quality of the job, the accuracy of the job setting, reduction of loading and unloading time, transfer job to various machine center without compromising the quality and functionality due to frequent resetting, on process inspection and rework on it if necessary are depends on the supporting equipments. The air machines which are operating either pneumatically or by means of steam or gas, need air sealing to prevent leakage of operating fuel. This research focuses on manufacturing of brush seal for gas turbines. The multiple loading and unloading at various machine centers produced some inaccuracies which lead the rejection or rework of brush seal jobs. Hence as per manufacturing process demand a complete fixture is designed to use universally for all manufacturing process at various machine center and inspection also with single setting of job. The proposed complete fixture saves time and cost effectively and assured quality and reliability of brush seal. The detailed study of problems and complete solution were discussed.
CFD analysis of solar still with PCM C. Gnanavel, R. Saravanan, and M. Chandrasekaran Elsevier BV Abstract The main objective of this project is the productivity improvement of the solar still by using the phase changing material, the experimental setup was made up of aluminium basin with Phase Changing Material and without Phase changing materials the experiment was conducted in morning 7 am to evening 6 pm hour based productivity and cumulative productivity are also calculated for with and without PCM material, Trimethylolethane and Paraffin C18 material is used for this experiment and the result of Paraffin C18 material produce the more productivity from this experiment, the same values are validate with the CFD analysis also.
Synthesis and characterization of treated banana fibers and selected jute fiber based hybrid composites R. Saravanan and C. Gnanavel Elsevier BV Abstract The hybrid composite is obtained by compounding the natural fiber with artificial or synthetic fibers in the reinforcement phase. For the current work the NaOH treated banana fibers of selected length of 15 mm and selected length of 30 mm jute fibers are combined with glass fibers for various weight fractions. The specimens of treated banana/glass fiber with epoxy hybrid composites synthesized by hand layup method with reinforcement of treated banana fibers wt% of 30%, 40%, and 50%. Similarly jute/glass fiber with epoxy hybrid composites synthesized by hand layup method with Jute reinforcement wt% of 30%, 40%, and 50%. The synthesized composites characterized by tensile behaviors with help of computerized tensile tester. The interesting results were reported.