Kanathur, India
Kanathur, India

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Chithambaram V.,AMET University | Das S.J.,Loyola College | Krishnan S.,R M K Engineering College
Journal of Alloys and Compounds | Year: 2011

Bisthiourea lead acetate Pb[SC(NH2)2] 2(CH3COO)2), a novel semi organic non linear optical crystal having dimensions 17 mm × 2 mm × 2 mm were grown using slow evaporation technique. The lattice parameters for the grown crystals were determined using single crystal XRD. The presence of functional groups for the grown crystals was confirmed using Fourier transform infrared (FT-IR) spectroscopy. The optical absorption studies show that the material has wide optical transparency in the entire visible region. The dielectric constant and dielectric loss has been studied as a function of frequency for various temperatures and the results were discussed in detail. The second harmonic generation was confirmed by Kurtz powder method and it is found to be 5 times than that of potassium dihydrogen phosphate (KDP) crystal. © 2011 Elsevier B.V. All rights reserved.

Anand B.,Mahendra Engineering College | Balasubramanian V.,AMET University
E-Journal of Chemistry | Year: 2011

The inhibition efficiency (IE) of an aqueous extract of Allamanda blanchetii (Purple) in controlling corrosion of mild steel which has been evaluated by weight loss method in the absence and presence of corrosion inhibitor at different time intervals at room temperature. The result showed that the corrosion inhibition efficiency of Allamanda blanchetii was found to vary with different time interval and different acid concentrations. Also, it was found that the corrosion inhibition behavior of Allamanda blanchetii is greater in sulphuric acid than citric acid medium. So Allamanda blanchetti can be used as a good inhibitor for preventing mild steel material. The surface analysis study confirms the corrosion of the mild steel and its inhibition by the inhibitor Allamanda blanchetii.

Pure and doped (Ni2+ and Cu2+) SnO2 nanoparticles was successfully synthesized by facile hydrothermal technique. The particles size, structure, morphology and composition of the samples were characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM) and energy dispersive X-ray analysis (EDX) spectroscopy. The optical properties of the samples were analyzed by ultraviolet-visible (UV-vis) and photoluminescence (PL) spectroscopy. The optical band gap energies of pure, Cu and Ni doped SnO2 nanoparticles were calculated to be 3.76, 3.83 and 3.87 eV, respectively. The PL emission spectrum shows that a strong luminescence peak located at 397 nm, which can be attributed to the near band-to-band edge transition recombination of electron-hole pairs. The smaller particle size of SnO2 nanoparticles showed apparent quantum confinement effects. Finally, the mechanism for the formation of quantum size SnO2 was also discussed.

Bhardwaj S.,AMET University
WMU Journal of Maritime Affairs | Year: 2013

While it is said that merchant ships are now so automated and sufficiently reliable for little skill to be demanded of those who control them, on the other hand, it is also argued that today's merchant ships are so complicated that only those who fully comprehend their complexities should be entrusted with their operation. This paper attempts to obtain more insight into this paradox and systematically examines the technological imperative in shipping and its accompanying challenges particularly the skilling dilemma. It then delves into the contrasting theories of technological change implications in the work environment before arriving at the plausible correct understanding that appears to provide the viable explanations and solution. © 2013 World Maritime University.

Karthikeshwaran R.,AMET University
Biosciences Biotechnology Research Asia | Year: 2015

A Progressive cavity pump is an artificial lifting technique used in oil and gas industries to pump heavy and sandy fluids from the low bottom hole pressure wells. The pump is a positive displacement pump having rotor and stator as the main component of the pump. The performance of pump gets decreased as the clearance between the rotor and stator increases. Increasing fluid viscosity has positive effect on the performance. The performance degradation of the pumpoccurs due to leakage flow through the least clearance gap between the rotor and stator. A computational work has been performed to find the characteristics of the leakage flow and Ansys CFX 12.1 software was used for the simulations. Meshing and solving of the fluid dynamics equation were done by Ansys CFX mesh and CFX solver, respectively. Present article presents the prediction of leakage for different fluid viscosities and diametric clearances.It was found that the rotor rotation helps in leakage flow if the flow and rotor surface velocity directions are same.

Single crystals of glycine-phthalic acid (GPA) were grown by slow evaporation process using aqueous solution. X-ray diffraction analysis was used to examine its cell structure and it was found that the GPA crystal corresponded to the orthorhombic system. To identify absorption range and cut-off wavelength for the GPA crystal, UV-visible spectrum was recorded. UV-visible spectroscopy was used to study the optical constants such as the refractive index, the extinction coefficient, electrical susceptibility, and optical conductivity. As a function of different frequencies and temperatures, the dielectric constant and the dielectric loss were examined. The electrical properties like plasma energy, Penn gap, Fermi energy, and polarizability were determined for the analysis of the second harmonic generation (SHG). Using the Kurtz powder technique, the SHG of the GPA crystal was studied. Investigations relating to hysteresis were carried out to ascertain the ferroelectric nature of the material. © 2016 The Minerals, Metals & Materials Society

The optically transparent and bulk single crystal of potassium boro-oxalate (KBO) was grown by slow evaporation technique. Single crystal X-ray diffraction analysis revealed the crystal system and determined lattice parameters. The optical properties of the KBO crystal were determined using UV-vis spectroscopy. Optical constants such as the refractive index, the extinction coefficient, electric susceptibility and optical conductivity were determined from UV-vis spectroscopy. The refractive index of the grown crystal was determined using the Brewster angle method. The presence of various functional groups was verified from the FTIR spectrum. The dielectric constant and the dielectric loss were measured as a function of different frequencies and temperatures. The AC electrical conductivity study revealed that the conduction depended both on the frequency and the temperature. The electrical properties such as plasma energy, Penn gap, Fermi energy and polarizability were calculated to analyze second harmonic generation (SHG). Second harmonic generation (SHG) of KBO crystal was investigated by Kurtz powder technique. © 2016 Elsevier GmbH. All rights reserved.

Rajavel R.,AMET University
Thermal Science | Year: 2014

An experimental and numerical study of heat transfer and flow characteristics of spiral plate heat exchanger was carried out. The effects of geometrical aspects of the spiral plate heat exchanger and fluid properties on the heat transfer characteristics were also studied. Three spiral plate heat exchangers with different plate spacing (4 mm, 5 mm, and 6 mm) were designed, fabricated and tested. Physical models have been experimented for different process fluids and flow conditions. Water is taken as test fluid. The effect of mass flow rate and Reynolds number on heat transfer coefficient has been studied. Correlation has been developed to predict Nusselt numbers. Numerical models have been simulated using CFD software package FLUENT 6.3.26. The numerical Nusselt number have been calculated and compared with that of experimental Nusselt number.

Munia raj A.,AMET University
International Journal of Engineering and Technology | Year: 2014

This paper focused on evaluation of machining parameters influencing thrust force during drilling of Al-SiC-Gr metal matrix composites using multifaceted carbide drills. There are three machining parameters i.e. Spindle speed, Feed rate, Drill diameter. Experiments are conducted on a vertical machining centre using Taguchi design of experiments. Taguchi orthogonal array is designed with three levels of drilling parameters with the help of software Minitab 15. A model is developed to correlate the drilling parameters with thrust force using Response surface Methodology (RSM).The results indicate that the developed model is suitable for prediction of thrust forces in drilling of Al/SiC/Gr composites. The influences of different machining parameters on thrust force of Al/SiC/Gr composites have been analyzed through contour graphs and 3D plots. The investigation has revealed that the type of spindle speed affects the thrust force significantly followed by the feed rate and drill diameter.

Sagadevan S.,AMET University
Journal of Optoelectronics and Advanced Materials | Year: 2016

Lead telluride (PbTe) thin films were synthesized using the Chemical Bath Deposition (CBD) technique. X-ray diffraction (XRD) analysis was used to study the structure and the crystallite size of PbTe thin film. The surface morphology of PbTe thin films were studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The optical properties were studied using the UV-Visible absorption spectrum. The optical constants such as band gap, refractive index, extinction coefficient and electric susceptibility were determined from UV-Visible absorption spectrum. The dielectric constant, dielectric loss and ac conductivity of the PbTe thin films were studied at different temperatures and frequencies to analyze the electrical properties.

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