Bharathidasan Engineering College

Vellore, India

Bharathidasan Engineering College

Vellore, India

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Kumar K.S.,Anna University | Senthilkumaar J.S.,Bharathidasan Engineering College
Applied Mechanics and Materials | Year: 2014

In this paper, a detailed comparison between dry, wet and gas-cooled turning has been presented based on experimental study. Machining of super duplex stainless steel is considered. Cutting tool considered in this paper is uncoated carbide tool. It was observed that gas cooled machining provides a better machining performance while compared with the dry and the wet machining. Gas cooled machining is particularly needed in case of high speed machining and hard turning. In this study we investigated the chip morphology for various condition of machining and concludes that gas cooled machining is suitable for machining at higher production rate. © (2014) Trans Tech Publications, Switzerland.


With the growing energy command due to growing world people and industrialization, utilizing strenuous solar energy for thermal and electrical power production will be the future renewable power source to decrease the confidence on fossil fuel and reduce carbon dioxide discharge. Besides by means of determined Photovoltaic (CPV) system, Concentrated Thermoelectric generator (CTEG) will be another possible option for sustainable power generation. The CTEG system utilizes concentrated solar flux as a heat source to the thermoelectric generating (TEG) module in generating direct current thermoelectricity which can be easily converted to alternating power using an inverter. By maintaining a temperature difference between the hot and cold sides of the thermoelectric cells (Seebeck effect), thermoelectricity is generated where its magnitude is a function of temperature difference. The main challenge is the effectiveness of excess heat removal which accumulated at the cold side of the thermoelectric cell to achieve greater power generation. Using acting cooling mechanisms are not energy efficient proposal as it requires power in operating them and significantly reduces the total power output generated. They are planned in the paper for working CTEG system through passive cooling and achieving invariable cooling. Two-phase closed thermosyphon is implement as an helpful heat transporting device for transfer excess heat from heated TEG part to the frozen PCM storeroom reservoir for heat luggage compartment. This investigation is to evaluate the thermal presentation of the proposed system. The working fluid used in the thermosyphon was Acetone and its filling ratio was designated at 40% of the evaporator volume. Paraffin wax was selected as PCM with melting point of 47°C and acceptably high latent heat storage was selected in the thermal storage. The passive cooling mechanisms consist of PCM storage tank, heat pipe-based heat transfer system for transporting heat from TEG modules to the PCM thermal storage during the daytime and a similar heat pipe-based system for discharging heat from PCM storage tank to the cooler ambient during the night time. © (2014) Trans Tech Publications, Switzerland.


Bakthadoss M.,University of Madras | Selvakumar R.,University of Madras | Manikandan N.,Bharathidasan Engineering College | Murugavel S.,Vellore Institute of Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

In the title compound, C18H17NO3S, the seven-membered thiazepine ring adopts a slightly distorted sofa conformation. The dihedral angle between the mean plane of the benzothiazepine ring system and the benzene ring is 5.9 (1)°. The molecular conformation is stabilized by an intramolecular C-H⋯S hydrogen bond, which generates an S(7) ring motif. In the crystal, N-H⋯O and C-H⋯O hydrogen bonds link inversion-related molecules into dimers, incorporating R1 2(6) and R2 2(8) ring motifs; the acceptor O atom is bifurcated. These dimers are further linked by C-H⋯O hydrogen bonds, forming supramolecular tapes running along the a axis. These are connected into the three-dimensional architecture by C-H⋯π interactions.


Murugavel S.,Vellore Institute of Technology | Manikandan N.,Bharathidasan Engineering College | Selvakumar R.,University of Madras | Bakthadoss M.,University of Madras
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

In the title compound, C16H11Cl2NOS, the seven-membered thiazepine ring adopts a distorted twist-boat conformation. The dihedral angle between the mean plane of the benzothiazepine ring system and the benzene ring is 78.6 (1)°. The molecular conformation is stabilized by a weak intramolecular C-H⋯Cl hydrogen bond, which generates an S(5) ring motif. In the crystal, pairs of N-H⋯O hydrogen bonds link inversion-related molecules into dimers, generating R2 2(8) ring motifs. The crystal packing also features alternating π-π interactions between benzothiazepine benzene rings [inter-centroid distance = 3.740 (3) Å] and dichlorobenzene rings [inter-centroid distance = 3.882 (3) Å] to consolidate a three-dimensional architecture.


Murugavel S.,Vellore Institute of Technology | Manikandan N.,Bharathidasan Engineering College | Kannan D.,University of Madras | Bakthadoss M.,University of Madras
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

The title compound, C14H13NO3S, (I), is a second monoclinic polymorph. The original polymorph, (II), was reported by Mahía et al. [Acta Cryst. (1999), C55, 2158-2160]. Polymorph (II) crystalllized in the space group P21/c (Z = 4), whereas the title polymorph (I) occurs in the space group P21/n (Z = 4). The dihedral angle between the two aromatic rings is 75.9 (1)° in (I) compared to 81.9 (1)° for (II). In both polymorphs, two S(6) rings are generated by intra-molecular N-H⋯O and C-H⋯O hydrogen bonds, resulting in similar mol-ecular geometries. However, the two polymorphs differ concerning their crystal packing. In (I), mol-ecules are linked into C(8) zigzag chains along the b axis by C-H⋯O hydrogen bonds, whereas in (II) mol-ecules are linked by C-H⋯O hydrogen bonds, forming C(7) chains along the b axis. The title polymorph is further stabilized by inter-molecular C-H⋯π and π-π inter-actions [centroid-centroid distance = 3.814 (1) Å]. These inter-actions are not evident in polymorph (II).


Senthil Kumar K.,Anna University | Senthil kumaar J.S.,Bharathidasan Engineering College
International Journal of Engineering and Technology | Year: 2013

The aim of this paper is to analyse the influence of turning parameters on the flank wear and chip morphology during a turning process. Here, the work piece material, Super duplex stainless steel SAF 2507 was turned with uncoated carbide tool. Liquid CO2 which acts as a coolant, forms a gas cooled environment. The gas cooled machining in turn was compared with the dry and wet machining. Totally 18 experiments were conducted in order to measure the flank wear (Vb) with a tool makers microscope. The experiments were performed with the same cutting conditions and tool characteristics on the three methods of cooling. During the experimental procedure the removed chips were collected and evaluated together with the various cutting conditions. Using MINITAB 15 software, the optimized values of machining parameters were predicted using response surface methodology. Confirmation tests were carried out to compare the results of predicted values with the experimental value. The flank wear and the chips produced at the optimized values are analysed by scanning electron microscope (JOEL Model 6390). From the experimental results, it was found that flank wear gets reduced in case of gas cooled machining.


Subbarayan M.R.,Alagappa Chettiar College of Engineering And Technology | Senthil Kumaar J.S.,Bharathidasan Engineering College
Biofuels | Year: 2015

An experimental investigation of diesel engine performance fuelled with cotton seed oil methyl ester (COME), pumpkin seed oil methyl ester (POME) and its blends with neat diesel using Exhaust Gas Recirculation technique have been carried out. An optimum nozzle opening pressure of 250 bar and lower static injection timing of 20° bTDC is considered as it has been observed that these conditions offer better performance and are lower in emissions. From the experimental results, it could be observed that there is a decreasing trend of emission characteristics of Hydro Carbon, smoke density and NOx for Exhaust Gas Recirculation (EGR) for both COME and POME at full load with respect to blend ratio. The percentage reduction in oxides of nitrogen for B100 COME-EGR is 1.39% and for B100 POME-EGR is 1.11% as compared to B100 conventional method. The percentage reduction in oxides of nitrogen for B25 COME-EGR is 0.94% and for B25 POME-EGR is 0.13% as compared to B25 conventional method at full load condition. The same trend is followed for all other blends such as B50 and B75. However, the use of EGR leads to a rise in soot emission because of the soot-NOx trade-off for both cases. © 2015 © 2015 Taylor & Francis.


Subbarayan M.R.,Alagappa Chettiar College of Engineering And Technology | Senthil Kumaar J.S.,Bharathidasan Engineering College
International Journal of Ambient Energy | Year: 2015

An experimental investigation of diesel engine using cottonseed oil biodiesel and its blends with exhaust gas recirculation (EGR) techniques has been carried out. An optimum nozzle opening pressure of 250 bar and lower static injection timing of 20° before top dead centre (bTDC) are considered because it has been observed that these conditions only give minimum emissions. From the test results, it could be noted that there is an increasing trend of emission characteristics of HC, smoke density and NOx for both cold and hot EGR for all blends of fuel with respect to brake power. As compared with cold EGR, the hot EGR gives lower emissions at all loads. In hot EGR, among the blends, at no-load and full-load conditions, the B100 gives the highest reduction in NOx of 14.23% and 7.91%, respectively. However, the use of EGR leads to a rise in soot emission because of soot–NOx trade-off for both the cases. © 2015 Taylor & Francis


Sudhakar A.,Bharathidasan Engineering College | Kalaiarasi K.,Tamil University
International Journal of Applied Engineering Research | Year: 2015

Protecting the digital data through encryption using tools and external codes are highly cost effective and also results in performance degradation. To achieve much efficiency in encryption a reconfigurable cryptographic microprocessor is designed in this project to offer maximum digital security. With the conventional design of Rijndeal and DES encryption standards as supporting co- processors, a brute force attack algorithm also been implemented in the design to ensure the robustness of this processor design to serve all kind of encryption and decryption needs. A typical CPU unit with RAM, ALU, PC, Register bank and Buses are included as prioritized units for utilizing the Cryptographic co-processors which consists of Parallel Processing Unit, Bit permutation unit, sequencing cache and Byte permutation units. A sophisticated instruction sets have been derived to issue control signals to the main processor to initiate and control cryptographic operations. The performance evaluation of this processing design also analyzed through a programmable FPGA kit. © Research India Publications.


Senthil Kumar K.,Anna University | Senthilkumaar J.S.,Bharathidasan Engineering College
Recent Patents on Mechanical Engineering | Year: 2014

This paper deals with the analysis and optimization of the surface roughness and tool flank wear when machining super duplex stainless steel with uncoated carbide inserts as cutting tool. The experiments are repeated in three different cutting conditions namely the dry, wet and gas cooled machining. Cutting speed, feed rate and depth of cut are the input turning process parameters considered. Taguchi's Full Factorial design of experiments is followed. Taguchi method is also used to analyze and optimize the output response parameters. Validation experiments are carried out to compare the experimental results with the predicted optimal values. This paper discusses the analysis and optimization of the output responses when machining super duplex stainless steel by referring the recent patents and scholarly articles on the subject of machining, cutting tool and application of such materials. © 2014 Bentham Science Publishers.

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