Mechanical Engineering

In this paper the numerical study of unsteady flow of a viscous incompressible fluid past an exponentially accelerated infinite vertical plate with radiation, viscous dissipation, chemical reaction and variable heat and mass diffusion have been analyzed in the porous medium. To obtain the non-similar momentum, energy, and concentration equations usual non-dimensional variables have been used. The dimensionless governing equations are solved numerically by explicit finite difference method. Here velocity, temperature and concentration fields are described graphically for the different physical parameters. Skin friction and Nusselt number profiles have been also described graphically here.

Environmental and Ecological issues call for the reduction in usage of cutting fluids in metal cutting industry. New techniques are being inquired to achieve this objective. Hard turning with minimum quantity lubrication is one such technique which can alleviate the pollution problems associated with cutting fluids. In the present work, vegetable oil based cutting fluids like castor oil, palm oil and ground nut oil is made to drop at tool-work interface using over-head system. The present paper deals with experimental investigation carried out for machinability study of hardened AISI D3 steel in combination with CVD coated cemented carbide inserts of different styles and to obtain optimum process parameters using Deng’s similarity approach. An orthogonal array, overall performance index and analysis of variance ( ANOVA) are applied to study the performance of process parameters such as insert style, cutting fluid cutting speed, feed and depth of cut with consideration of quality characteristics i.e., surface roughness, material removal rate and specific energy. Finally a clear presentation is made for Deng’s approach

In the present day scenario of manufacturing industry, quality and productivity play a significant role. Surface roughness and material removal rate are indicators of quality and productivity as also interface temperature and flank wear are the indicators of tool life. Hence surface roughness, material removal rate, interface temperature and flank wear are considered as response characteristics. This article focuses on an approach based on Grey relational analysis and Desirability function analysis for optimizing the process parameters during turning of AISI D3 steel with CVD coated tool with multiple performance characteristics. Experimentation were carried out on a Conventional lathe using L9 orthogonal array based on Taguchi design of experiments. The influence of spindle speed, feed and depth of cut were analyzed on the performance of surface roughness, material removal rate, interface temperature and flank wear .The optimal turning parameters are determined by composite desirability index and grey relational grade. Analysis of variance(ANOVA) is used to determine the influence of parameters which significantly affect the responses simultaneously. From the study, it is concluded that machining performance is significantly improved.

The main objective of the present work is to conduct the computational study of steady flow through the air intake system of a multicylinder SI engine. The CAD geometry of the air intake system of the multi cylinder in line engine was created. Two modification on the induction side one with circular cross section (Path A) and another with rectangular cross section (Path B) were carried out. All the three models are simulated using ANSYS FLUENT, CFD code for the computational study, steady state flow conduction was assumed and the analysis is carried out assuming the intake air flows steady into the system at mean piston speed of the engine. Flow field is predicted by solving the Navier strokes equation and the turbulence is modelled using k-? RNG model. Good agreement is observed from predicted result.

A Study on moisture management properties for Polyester with Bamboo Biply knitted fabrics has been reported. The polyester (80 D), Bamboo yarn (30s and 40s Ne) were selected to produce the Biply rib knitted fabrics with various areal density, thickness and tightness factors to analyze the moisture management properties of fabrics. It was observed that polyester with bamboo Biply knitted fabrics have higher air permeability than the polyester with cotton Biply knitted fabric. It is also observed that there is a significant difference between water vapour permeability of polyester with bamboo and polyester with cotton Biply knitted fabrics. It is also found that the polyester with bamboo knitted fabric has better wicking rate than the polyester with cotton Biply knitted fabrics. This Polyester with Bamboo Biply knitted fabrics materials can be used to prepare the composite materials.

The thermal performance of tractor radiator is improved with Cu/water when compared with CuO/water nanofluids as workings fluid. The nanomaterial plays a vital role for past two decades in the research areas like thermal management and material science. Miniaturization and increased operating speeds of heat exchangers warranted the need for new and innovative cooling concepts for better performance. The nano materials and its suspension in fluids as particles have been the subject of intensive study worldwide recently since pioneering researchers recently discovered the anomalous thermal behavior of these fluids. For heavy vehicles the engine cooling is an important factor for their performance in the intended application. Here the tractor engine radiator cooling is enhanced by nanofluid mechanism of heat transfer for its improved performance in agricultural work. If the tractor engine cooling is enhanced then using this farm equipment more agricultural field can be ploughed which can be utilized for cultivation within a short period of time. Heat transfer in automobile is achieved through radiators. In this research work an experimental and numerical investigation for the improved heat transfer characteristics of a radiator using Cu/water and CuO/water nanofluid for 0.025, 0.05 and 0.075% volume fraction is done with inlet temp of 50 - 60°C under the turbulent flow regime (8000 ? Re ? 25000). The overall heat transfer coefficient decreases with increase in nanofluid inlet temperature of 50 - 60°C. The experimental results of the heat transfer using the Cu metal particles of nanofluid is compared with Oxide and the numerical values which shows an increase in heat transfer coefficient. The results in this work suggest that the best heat transfer enhancement can be obtained compared with the base fluid and oxide form by using a system with Cu/water nanofluid-cooled radiators. The nanofluids showed better heat transfer characteristics as a new alternative coolant for the radiator.

The conventional solar still is modified by thermal energy storage material (Fly ash particles) to absorb the maximum amount of solar energy during shiny hours to increase the evaporation rate. In this work, fly ash is used effectively to store the thermal energy and also support the still to minimize the heat loss through bottom and side wall of the solar still. The fly ash is effectively used in the solar still to maintain the greater temperature difference between the glass inner surface and water by absorbing the excess amount solar energy during shiny hours. So, evaporation rate increases in the solar still. The quantity of the fly ash in the basin will influence the productivity of the still and other parameters like water temperature‚ glass surface temperature and vapour temperature etc. In this work, the experimental work has been conducted for various quantity of water and various depth of fly ash to find the optimum quantity of water and depth of fly ash in the basin. Finally, the performance of the modified solar still is compared with the conventional solar still under the same climate conditions. The productivity of the modified still is improved by 71 %.

In this current time of globalization and privatization, manufacturing firms are greatly relying upon the concept of failure mode effective analysis to fight with challenges of current market trends. This paper help to perceive and overcome the irregularities in plastic product by apply application of “FMEA”. It is focused on preventing problems, enhancing safety, and rising customer satisfaction. Due to implementation of FMEA can get larger benefits, such as improving product quality, reliability, and security, enhancing company's image and competitiveness, satisfying customer requirements, etc.

In our country most of the population has agriculture as a primary source of income. Agricultural output consist of 16% of India GDP but in most parts of our country there is scarcity of water. To give boost to agriculture the earliest leaders of the country had given primary importance to irrigation projects. But day by day it’s becoming need of the hour to utilize micro irrigation techniques like drip and sprinkler irrigation. In our country most of the farmers utilize conventional process of pipe collection. But it effects the life of pipes, while collecting the pipes it forms scratches, minute holes, bends and while utilizing next time its efficiency has been decreased so these paper deals with the application of a simple mechanism to coil the pipes and collect it without bending or forming twist and increasing its efficiency and long life. It deals with very basic but un-noticed problem related to drip irrigation pipes.

Scarcity of drinking water has been a major problem that most parts of this world are facing since years. Though many methods are there like electric water purifiers, they all are having very high initial and operational cost. Solar still is an exception for this. But, due to its lower yield, it is not yet commercialized. Most of those works to improve solar still efficiency and yield were given emphasize to improve the evaporation rate. But the condensation characteristics are also important. Condensing cover of the solar still and its inclination is one of such areas where detailed study is required. This research paper is intended to find the optimum inclination for the condensing cover for a solar still so as to get the maximum yield.