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Venkata Swamy B.,Padmasri Dr Bv Raju Institute Of Technology | Madhumala M.,Indian Institute of Chemical Technology | Prakasham R.S.,Indian Institute of Chemical Technology | Sridhar S.,Indian Institute of Chemical Technology
Chemical Engineering Journal | Year: 2013

Nanofiltration (NF) and reverse osmosis (RO) and are membrane-based separation processes which can be used for treatment of industrial effluents and wastewater recycling. In the present study, performance of functionalized nanofiltration (FNF-400) and thin film composite (TFC) polyamide RO membranes has been investigated for the treatment of industrial effluent consisting of 5710ppm total dissolved solids (TDS), 4050ppm chemical oxygen demand (COD) and 8.4ppm biochemical oxygen demand (BOD). Effect of various parameters such as applied pressure and feed composition on parameters such as permeate conductivity and flux, TDS rejection, turbidity removal besides COD and BOD reduction was evaluated. At a constant feed pressure of 21bar, higher average flux of 36.95L/m2h was observed in case of NF when compared to 18.77L/m2h for RO. The % rejections of TDS, turbidity and COD were observed to be 85%, 97.8% and 73.33% for NF and 95%, 100% and 86.66%, respectively for RO systems. A statistical mechanical model was developed for commercial NF and RO systems. The economic estimation of commercial NF/RO systems was carried out which reveals that NF process is more economical due to lower operating pressures and consequently lesser energy consumption. © 2013 Elsevier B.V. Source


This paper focuses on the effects of chemical reaction on an unsteady magnetohydrodynamic free convection fluid flow past an infinite vertical porous plate with constant suction. The dimensionless governing equations are solved numerically by a finite element method. The effects of the various parameters on the velocity, temperature and concentration profiles are presented graphically and values of skin-friction coefficient, Nusselt number and Sherwood number for various values of physical parameters are presented through tables. Source


Venkata Ramana Chary R.,Padmasri Dr Bv Raju Institute Of Technology | Rajya Lakshmi D.,King Abdulaziz University
2012 IEEE International Conference on Computational Intelligence and Computing Research, ICCIC 2012 | Year: 2012

Databases, libraries of digital image and multimedia are considerably expanded in last few years. The growth of a content-based image retrieval (CBIR) system has become main research issue in order to retrieve the desired images successfully and accurately from a large image database. In this paper we concentrated on image features and features extraction and comparisons for similarity. We processed huge amount of images and extracted the each image converted into gray form then extracted edges and calculated connecting points of each image. All connected points we stored into the database then based on query image feature values are compared then images are equating. Observations are showing that this process shown the good result comparatively existed methods. © 2012 IEEE. Source


Vaddi R.,Padmasri Dr Bv Raju Institute Of Technology | Agarwal R.P.,Shobhit University | Dasgupta S.,Indian Institute of Technology Roorkee
IEEE Transactions on Electron Devices | Year: 2012

In this brief, a new analytical model to compute the potential distribution in gate overlap and underlap regions of a generic double-gate (DG) MOSFET (valid for asymmetric features in front- and back-gate insulator thicknesses, gate bias, and gate work functions) for operation in the subthreshold condition is proposed. A closed form solution to 2-D Poisson's equation is obtained with approximation of parabolic potential function along vertical direction of the device. Conformal mapping technique is applied for modeling fringe electric field in the underlap regions. The proposed potential model is extended in deriving important device parameters such as threshold voltage, threshold voltage rolloff, DIBL, subthreshold swing, etc. Model predictions demonstrate that significant improvement in subthreshold operation can be achieved with 4T asymmetric underlap DG MOSFETs in comparison to 3T symmetric nonunderlap DG MOSFETs. © 2012 IEEE. Source


Rao M.L.,Padmasri Dr Bv Raju Institute Of Technology
Journal of the Institution of Engineers (India), Part PR: Production Engineering Division | Year: 2010

Flow forming is an advanced eco-friendly chipless metal forming process for producing axi-symmetric components from plates or preforms which has several advantages, like improved mechanical properties and surface quality for a finished part. Components produced through this process are widely used in aerospace and missile applications. In this study, the effect of contact geometry between the roller and the workpiece and influence of the critical mechanical parameters, such as, the feed rate, the shape of the contact line, the roller attack angle were studied. The experiments were carried out on a single roller flow forming machine. It is found that the S/L ratio increases with roller attack angle (a) and feed rate; when preform thickness increases, the S/L ratio decreases. When the shape of contact line (S/L) becomes too large, then the friction coefficient between the roller and the workpiece becomes close to unity. Hence, it is essential to carry out to analyse an inappropriate selection of parameters hinders the material flow, leading to specific types of defects. Source

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