Volume 02 Issue 01

Abstract: A model for estimate of outlet water temperature under hot and humid condition in a mixed counter-flow cooling tower was developed. With an assumption that the cooling tower reacted as an adiabatic continuous and stable system, the water outlet temperature was theoretically estimated as function of climate conditions and structure of the cooling tower. A complete set of experimental data on the water outlet temperature in a lab-scale cooling tower operating under the same climate conditions were taken for comparison that have shown a good agreement with the predicted results.

Abstract: In the present work, the main consideration is made on the mass and strength of the mechanical engineering components. Nano composites materials have high potential for use in structural applications in which improved mechanical properties are very essential. The aluminum matrix nanocomposites are finding wider applications in the various fields of engineering and medicines like aerospace, defense, automobiles, electronics, materials, chemistry, energy, environment, information & communication, consumer goods and bio-technology. Aluminum is most suitable alternative for these purposes. In this research work, aluminum as the metal matrix composites and Al2O3 nano-particles as reinforcement with different weight %age as 1.0, 1.5, 2.0, 2.5, 3.0 were used and prepared by Ultrasonic assisted stir casting process. Wear behavior of prepared specimens were thoroughly studied with different type of operating parameters. In this research, the operating parameters considered are applied load, coefficient of friction and sliding velocity. The experimental results indicate that the reinforcement material Al2O3 present in aluminum alloy composites lowers the friction and wear rate.

Abstract: The aim of the present work is to develop a model which can predict the cutting force and surface roughness during hard turning of AISI 52100 alloy steel (62 HRC) under minimum quantity lubrication using PVD-coated nanocrystalline TiSiN-TiAlN coated carbide tool. Experiments were carried out varying the cutting speed, feed and depth of cut in the wide range of cutting conditions to investigate the effect of cutting parameters on the responses studied in the present investigation. The predicted cutting force and surface roughness values obtained at various cutting conditions were validated with the experimental results. The correlation coefficient found to close to 0.9, which showed that the developed models are reliable and could be used effectively for predicting the cutting forces and surface roughness for the given tool and work material pair and within the domain of the cutting parameters.

Abstract: The heat transfer processes in diesel engine piston can be modeled with a variety of methods. In this paper, an inverse heat transfer method is employed to conduct thermo-mechanical FE analysis. Considering the thermal boundary condition for numerical simulation; thermal stresses, mechanical stresses and the distortion of the piston have been calculated at various section in the piston body under the thermal loading thus providing reference for design improvement. Contours of displacement of nodal points and stresses introduce were shown as well. Results show that, the main cause of the piston safety, piston deformation and the great stress is the temperature, so it is possible to further decline the piston temperature with structure optimization. Measuring the stresses in different parts of the cylinder head and of the piston, we can adjust the cooling, or we can improve the materials or even we can improve the properties of the fuels.

Abstract: In the present study, the performance, emission and combustion characteristics of a conventional diesel engine and a low heat rejection engine have been evaluated using diesel and diesel-CNSO-EEA blended fuel. Study was carried out in the LHR engine with wide range of engine load conditions. During the study, performance, emission and combustion characteristics of both the fuels were tested and compared. The results showed that the blended fuel in LHR engine offers higher brake thermal efficiency and lower fuel consumption compared to conventional engine. The emission parameters are low in LHR engine. The ignition delay of the diesel-CNSO-EEA fueled LHR engine is very low compared others and the maximum pressure is very high.

Abstract: Using wire EDM technology (WEDM), hard to machine and electrically conductive components are machined. Similarly cylindrical wire electrical discharge turning (CWEDT) process was developed to generate precise cylindrical forms on hard to machine materials. A precise, well designed set up was developed and added to CNC WEDM machine. This setup was required to hold the work-piece and impart rotary motion to it. This paper mainly investigates on the effects of machining parameters on MRR and surface roughness in cylindrical wire electrical discharge turning (CWEDT) process. In this research stainless steel of grade (316) was used in the experiments because of its growing applications in the field of manufacturing in the cylindrical forms. The machining parameters such as rotational speed, pulse off time, pulse-on time, wire feed and spark gap have been analysed using Taguchi method.