Theneshkumar S.,St Peters Engineering College |
Nagendra Gandhi N.,Anna University
Journal of Chemical and Engineering Data | Year: 2010
The effect of various hydrotropes such as sodium salicylate, sodium benzoate, and nicotinamide on the solubility and mass transfer coefficient of stearic acid was investigated under a wide range of hydrotrope concentrations, (0 to 3.0) mol·kg -1, and different system temperatures, T = (303 to 333) K. It was found that the solubility and mass transfer coefficient of stearic acid increase with the increase in hydrotrope concentration and also with system temperature. All hydrotropes used in this work showed an enhancement in the solubility and mass transfer coefficient to different degrees. The order of increase in the solubility and mass transfer coefficient of stearic acid with respect to different hydrotropes was found to be sodium salicylate > sodium benzoate > nicotinamide. The maximum enhancement factor value has been determined for both the solubility and the mass transfer coefficient. The effectiveness of hydrotropes was measured in terms of Setschnew constant K s and reported for all hydrotropes used in this study. In addition the solubility data are also fitted in a polynomial equation as a function of hydrotrope concentration. The solubility data fitted in a polynomial equation give a better fit since the variance is less than 0.6. © 2010 American Chemical Society.
Sumathi S.,Sathyabama University |
Malini R.R.H.,St Peters Engineering College
European Journal of Scientific Research | Year: 2012
Multimodal system, which combines more than one biometric trait, gives better recognition performance compare to system based on a single biometric modality. It obtains today's increasing demand of high accuracy in biometric system. This paper proposes a multimodal biometric system using two traits i.e. face and palm print for person recognition. In this proposed method use an efficient technique for an authentication with an average half face and selected window size palm print features. Integrating the features increases robustness of the person authentication. Discrete Wavelet Transform (DWT) is used for feature extraction and Support Vector Machine (SVM) is proposed for classification. The final decision is made by fusion at matching score level. The proposed method was tested using chimerical datasets consists of the cropped extended Yale database, IIT palm print database. High recognition performance has been obtained by fusion of these features. The experimental results showed the effectiveness of system in terms of GAR and FAR. It shows a high degree of success in identifying the individual with reduced computation time and memory storage by using efficient features. © EuroJournals Publishing, Inc. 2012.
Periyasamy P.,St Peters Engineering College |
Mohan B.,Anna University |
Balasubramanian V.,Annamalai University
Journal of Materials Engineering and Performance | Year: 2012
Metal matrix composites (MMCs) reinforced with SiC particles combine the matrix properties with those of the ceramic reinforcement, leading to higher stiffness and superior thermal stability with respect to the corresponding unreinforced alloys. However, their wide application as structural material needs proper development of a suitable joining process. In this investigation, an attempt was made to study the effect of heat input on the evolution of microstructure in weld region of friction stir welded AA6061-10% SiCp MMCs. The tensile properties of the joints were evaluated and they are related with microstructure and heat input of the process. The microstructure characterization of the weld zone shows evidence of a substantial grain refinement of the aluminum matrix and fracturing of reinforcement particles due to dynamic recrystallization induced by the plastic deformation and frictional heating during welding. © ASM International.
Pandiyarajan V.,Anna University |
Chinna Pandian M.,St Peters Engineering College |
Malan E.,Anna University |
Velraj R.,Anna University |
Seeniraj R.V.,Anna University
Applied Energy | Year: 2011
The exhaust gas from an internal combustion engine carries away about 30% of the heat of combustion. The energy available in the exit stream of many energy conversion devices goes as waste, if not utilized properly. The major technical constraint that prevents successful implementation of waste heat recovery is due to its intermittent and time mismatched demand and availability of energy. In the present work, a shell and finned tube heat exchanger integrated with an IC engine setup to extract heat from the exhaust gas and a thermal energy storage tank used to store the excess energy available is investigated in detail. A combined sensible and latent heat storage system is designed, fabricated and tested for thermal energy storage using cylindrical phase change material (PCM) capsules. The performance of the engine with and without heat exchanger is evaluated. It is found that nearly 10-15% of fuel power is stored as heat in the combined storage system, which is available at reasonably higher temperature for suitable application. The performance parameters pertaining to the heat exchanger and the storage tank such as amount of heat recovered, heat lost, charging rate, charging efficiency and percentage energy saved are evaluated and reported in this paper. © 2010 Elsevier Ltd.
Pandiyarajan V.,Anna University |
Chinnappandian M.,St Peters Engineering College |
Raghavan V.,Anna University |
Velraj R.,Anna University
Energy Policy | Year: 2011
The exhaust gas from an internal combustion engine carries away about 30% of the heat of combustion. The energy available in the exit stream of many energy conversion devices goes as waste. The major technical constraint that prevents successful implementation of waste heat recovery is due to intermittent and time mismatched demand for and availability of energy. The present work deals with the use of exergy as an efficient tool to measure the quantity and quality of energy extracted from a diesel engine and stored in a combined sensible and latent heat storage system. This analysis is utilized to identify the sources of losses in useful energy within the components of the system considered, and provides a more realistic and meaningful assessment than the conventional energy analysis. The energy and exergy balance for the overall system is quantified and illustrated using energy and exergy flow diagrams. In order to study the discharge process in a thermal storage system, an illustrative example with two different cases is considered and analyzed, to quantify the destruction of exergy associated with the discharging process. The need for promoting exergy analysis through policy decision in the context of energy and environment crisis is also emphasized. © 2011 Elsevier Ltd.
Purushothaman K.,St Peters Engineering College |
Nagarajan G.,Anna University
International Journal of Engine Research | Year: 2010
This paper describes an experimental study concerning the feasibility of using orange oil obtained from orange peel. The combustion, performance, and emission characteristics of a direct-injection (DI) diesel engine were studied using orange oil and diethyl ether (DEE). DEE was inducted as an ignition improver through the induction manifold, and orange oil was injected into the engine through a conventional fuelling device as a primary fuel. The test results indicate that the performance of the orange oil-DEE fuel was better than that of diesel fuel. The peak cylinder pressure and heat release rate were found to be higher for the orange oil-DEE fuel than those of diesel fuel. The hydrocarbon and carbon monoxide emission levels in the engine exhaust increased with orange oil-DEE compared with those of diesel fuel. The smoke and NO x emissions were lower with orange oil-DEE compared with diesel fuel. It is concluded that a diesel engine operated using orange oil-DEE gives simultaneous reduction in NOx and smoke emissions with better performance. © IMechE 2010.
Saravanakumar K.,St Peters Engineering College |
Baskaran R.,St. Joseph's College |
Kubendran T.R.,Anna University
Journal of Solution Chemistry | Year: 2011
Densities, viscosities and refractive indices have been determined for mixtures of acetophenone with N,N-dimethylethanolamine or with N,N-diethylethanolamine over the entire composition range at temperatures of (303.15, 313.15 and 323.15) K. The viscosity values were fitted to the Krishnan-Laddha and McAllister models. The thermophysical properties under study were also fitted to the Jouyban-Acree model. The excess values were correlated using the Redlich-Kister polynomial equation. It was found that, in all cases, the obtained data were correlated very well by the corresponding models. The molecular interactions existing between the components are also discussed. © Springer Science+Business Media, LLC 2011.
Loganathan P.,Anna University |
Golden Stepha N.,St Peters Engineering College
International Review of Mechanical Engineering | Year: 2012
The present paper deals with the analysis of heat and mass transfer of a micropolar fluid on continuously moving plate with suction or injection. The plate is moving with a constant velocity in the fluid which is considered as gray, absorbing-emitting but non-scattering medium. The radiative heat flux and viscous dissipation are taken into account in the energy equation. The partial differential equations governing the flow have been transformed into system of ordinary differential equation and solved numerically by fourth order Runge-Kutta method with shooting technique. The velocity, microrotation, temperature, concentration, skin-friction, rate of heat and mass transfer are shown graphically. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.
George D.,St Peters Engineering College |
Blieck A.,Lille University of Science and Technology
PLoS ONE | Year: 2011
Tetrapod fossil tracks are known from the Middle Devonian (Eifelian at ca. 397 million years ago - MYA), and their earliest bony remains from the Upper Devonian (Frasnian at 375-385 MYA). Tetrapods are now generally considered to have colonized land during the Carboniferous (i.e., after 359 MYA), which is considered to be one of the major events in the history of life. Our analysis on tetrapod evolution was performed using molecular data consisting of 13 proteins from 17 species and different paleontological data. The analysis on the molecular data was performed with the program TreeSAAP and the results were analyzed to see if they had implications on the paleontological data collected. The results have shown that tetrapods evolved from marine environments during times of higher oxygen levels. The change in environmental conditions played a major role in their evolution. According to our analysis this evolution occurred at about 397-416 MYA during the Early Devonian unlike previously thought. This idea is supported by various environmental factors such as sea levels and oxygen rate, and biotic factors such as biodiversity of arthropods and coral reefs. The molecular data also strongly supports lungfish as tetrapod's closest living relative. © 2011 George, Blieck.
Palvannan V.,Jaya Engineering College |
Balagurunathan K.,St Peters Engineering College
European Journal of Scientific Research | Year: 2012
Cashew is an immigrant tree from Eastern Brazil and now among the top three commercial crops of India. Cashew Nut Shell contains 25-34% oil which was not much used earlier. Commercial and industrial applications are being developed in the recent decade. This research work investigates cold pressed, straight Cashew Nut Shell Liquid (CNSL) as an alternative fuel for Internal Combustion Engine, which was not experimented earlier. CNSL can power the engines at cashew processing industries and surrounding places and has the cost saving advantage due to its much lesser price compared to diesel. In this experimental investigation, the effect of using straight CNSL - diesel blends of 10%, 20%, 30%, and 40% by volume, are evaluated for brake power, thermal efficiency, emissions and combustion characteristics of a single cylinder, compression ignition engine. For direct blending, brake thermal efficiency is closer to neat diesel upto 20% CNSL. For 30% CNSL blend, Brake Thermal Efficiency is 2 to 3% less than that of neat diesel operation. The peak cylinder pressure, heat release rate for CNSL-diesel blends diminish slightly compared to those of diesel fuel operation with increasing CNSL proportions. Diesel knocking was observed for 40% CNSL and engine could not reach full load. Carbon monoxide (CO) decreases upto 65% load and then increases. Hydrocarbon and smoke emissions are closer to diesel at higher loads. Oxides of Nitrogen (NOx) emissions are higher by 90 to 320ppm compared to neat diesel. Overall it can be concluded that upto 35% CNSL-diesel blends can be safely used in diesel engine without any additive or modification. © 2012 EuroJournals Publishing, Inc.