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Vinayagamoorthy R.,Tamil University | Rajeswari N.,Veltech Multitech Dr Rangarajan Dr Sakunthala Engineering College | Vijayshankar S.,University | Balasubramanian K.,Vel Technology Engineering College
International Review of Mechanical Engineering | Year: 2014

The present study is carried out to study the damage observed at entrance and exit of the hole during drilling and surface quality of drilled hole on newly developed natural hybrid composites. Hybrid composite samples are prepared by using vinyl ester resin and three types of reinforcements namely, randomly oriented vetiveria zizanioides, woven jute and woven glass. The natural fibers are pre-treated with alkali and furnace heating in order to improve its surface properties. Three samples are developed by varying the composition of fibers in each one. Machinability study is done by drilling a series of 28 holes based on D-optimal design. Three output responses namely, damage factor at entrance and at exit and surface roughness are measured and optimized with an objective of minimizing the damages. Confirmatory runs are conducted and the responses are measured. The results are validated by calculating the average percentage of error between the model and confirmatory runs. The error was found to be minimal and hence the optimization is highly satisfactory. © 2014 Praise Worthy Prize S.r.l. - All rights reserved. Source


Sreenivasan R.S.,Veltech Multitech Dr Rangarajan Dr Sakunthala Engineering College | Krishna Moorthy P.,Bharath University | Deecaraman M.,Dr. M.G.R. Educational and Research Institute
Journal of Chemical and Pharmaceutical Research | Year: 2011

The fresh water field crab, Spiralothelphusa hydrodroma is an important human food source in parts of South India and the crab is constantly exposed to pesticides, which are used extensively to control agricultural pests. Evaluation of the toxic effect of cypermethrin on the experimental crab for the LC 50 value was carried out. Effect of cypermethrin on the quantitative study of the nutritive value viz., protein, carbohydrate and lipid in ovary, spermatheca, hepatopancreas, muscle, gills, haemolymph, brain, thoracic ganglia and eyestalk was studied. It is concluded that the accumulation of cypermethrin in the hepatopancreas is found to be exponential in an environment of cypermethrin which is commonly used as biocides and fertilizers. Source


Nagarajan P.K.,Saengineering College | Vijayakumar D.,Veltech Multitech Dr Rangarajan Dr Sakunthala Engineering College | Paulson V.,Hindustan University | Chitharthan R.K.,Hindustan University | And 3 more authors.
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2014

In this study, the effect of geometry on the performance of a tetrahedral solar still was experimentally investigated on Chennai climatic conditions. In this work, a solar still of area 0.95 m2 and a glass cover in a triangular form was designed and fabricated. Environmental parameter includes solar intensity, ambient temperatures, and wind speed. Operational parameters are feed water quantity and orientation. Tests were conducted in Hindustan Institute of Technology and Science, Kelambakkam, Chennai, India. The maximum distillate output found was 4.3 lm-2day-1. The results shows that the production of fresh water was increase up to 40% compared to that of other conventional solar stills. Source


Priya M.,Veltech Multitech Dr Rangarajan Dr Sakunthala Engineering College | Saravanan R.S.S.,Alagappa Chettiar College of Engineering And Technology | Mahadevan C.K.,Physics Research Center
Energy Procedia | Year: 2012

CdS nanocrystals were synthesised by a simple and novel solvothermal method using a domestic microwave oven. X-ray diffraction measurements indicate that, for all the three molecular ratios (1:1, 1:2 and 1:3) of reactants considered, the crystallite size is controlled to less than 14 nm. UV visible absorption spectral measurements show an optical bandgap within the range of 2.62-2.77 eV. Energy dispersive X-ray absorption spectral, DC and AC (with a fixed frequency of 1 kHz) electrical (at various temperatures ranging from 40-110°C) measurements were also carried out on all the three samples prepared. The results obtained indicate that the electronic contribution plays a dominant role in charge transport process and polarisability. © 2011 Published by Elsevier Ltd. Source


Nagarajan P.K.,Saengineering College | Vijayakumar D.,Veltech Multitech Dr Rangarajan Dr Sakunthala Engineering College | Paulson V.,Hindustan University | Chitharthan R.K.,Hindustan University | And 3 more authors.
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2014

The present project work is to explore the convective heat transfer coefficient characteristics of Ethylene glycol/Silver nano fluids for heat transfer applications. Theoretical investigation on heat transfer characteristics are carried out by varying the mass flow rate, length of the tube and particle volume fraction. Heat transfer coefficient increases when the mass flow rate increases and the length of the tube decreases. The convective heat transfer coefficient of EG/Ag nano fluid is higher than that of the base fluid. It is also seen that the value of enhancement in convective heat transfer coefficient increases with respect to Reynolds number. At 0.1 vol % Ag, the convective heat transfer coefficient is enhanced by 7.5 % and 0.4 vol % Ag, the nanofluid shows an enhancement of 30 % respectively. Source

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