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Srinivasa Rao T.,VNR Vignana Jyothi Institute of Engineering and Technology | Maheswar Gowd B.,Jawaharlal Nehru Technological University Anantapur
Materials Today: Proceedings | Year: 2015

From the literature it is found that, two different approaches were followed for the prediction of transverse thermal conductivity (K2) of FRP composites. In the first approach, the internal anisotropy of the lamina is assumed negligible and K2 is estimated using simple Fourier's law of 1-D heat conduction applied to Representative Volume Element (RVE). Whereas in the second approach, electrical analogy method is followed. To estimate the effect of internal anisotropy, through thickness thermal conductivity (K3) of an FRP lamina is determined by both the approaches using the Finite Element method for an RVE in the auxiliary plane. The problem is modelled in ANSYS 15 software. In the present paper studies are made for various Kf/Km values (1-50) and for various angles (200-900) made by the section plane with the fiber axis. It is observed that the through thickness thermal conductivity is consistent in the second approach, whereas in the first approach there is considerable variation (max. 8.6%) with the orientation of the unit cell. © 2015 Elsevier Ltd. Source

Naidu V.G.,VNR Vignana Jyothi Institute of Engineering and Technology
Procedia Engineering | Year: 2015

A front tracking finite difference method is developed for a two phase one dimensional classical Stefan problem. The method, to start with, requires two time step sizes needed for the front to move a fixed spatial distance each. Two equations are derived applying Green's theorem of vector calculus for two regions of the problem and solved by bisection method to obtain these time steps. Subsequent steps are obtained, one by one, by applying bisection method to the discrete form of the Stefan condition. This front tracking method is much simpler and natural than the methods based on enthalpy formulation and can take care of source or sink terms on the front. Enthalpy formalism overlooks the Stefan condition which is a vital ingredient in the development of our method, Problem of freezing of a slab as well as freezing of a spherical droplet is presented as examples. © 2015 The Authors. Source

Amjad S.,VNR Vignana Jyothi Institute of Engineering and Technology | Rudramoorthy R.,PSG College of Technology | Sadagopan P.,PSG College of Technology | Neelakrishnan S.,PSG College of Technology
Energy | Year: 2016

In Asia, two wheelers are popular mode of transportation to a large group of people because of their relative affordability and ability to maneuver in heavy city traffic. However, the rate of fuel consumption and emission contribution by them, especially in urban areas need more attention to improve sustainability of energy and air quality. Recently, plug-in hybrid technology has been emerged as one of the most promising alternatives in reducing petroleum consumption and emission. This paper presents the implementation of plug-in hybrid technology on a two wheeler by formulation of novel control strategy suitable for Indian city driving needs. Experimental investigations on hub motor and IC (internal combustion) engine has been carried out to fix the change-over speed in hybrid mode, followed by road test on prototype vehicle. The performance of prototype vehicle on IDC (Indian driving cycle) simulated road pattern and actual road driving, confirmed the change-over speed of vehicle in hybrid mode. The converted plug-in hybrid electric two wheeler also demonstrated the drive strategy adopted for higher energy efficiency up to 2.5 times. So, plug-in hybrid electric two wheelers show significant improvements in fuel economy by replacing petroleum fuel with electricity for portions of trip to achieve nations' energy security. © 2016 Elsevier Ltd. Source

Sumithra M.,JNTUHCEH | Aparna Y.,JNTUHCEH | Raghavendra Rao P.,VNR Vignana Jyothi Institute of Engineering and Technology | Srinivasa Reddy K.,JNTUHCEH | Ranjith Reddy P.,JNTUHCEH
Materials Today: Proceedings | Year: 2016

Metal nanoparticles are playing an essential role in this nano era. In the present study, silver nanoparticles(Ag NPs) were prepared by the green synthesis method from the extract of Ocimum tenuiflorum (tulasi) leaves. In the present study the morphology of silver nanoparticles was studied as a function of various synthesis conditions. Ag NPs were prepared using tulasi decoction and fresh tulasi juice. The flower like structure of Ag NPs was observed when tulasi decoction was used for the synthesis. Spherical Ag NPs formed when tulasi juice was used instead. The morphology and grain size of silver nanoparticles were obtained from SEM images. The elemental analysis of silver nanoparticles was done with EDS. The formation of Ag NPs was confirmed from the absorption spectrum. The absorption edge was observed in the range of 200-700nm. © 2016 Elsevier Ltd. Source

Radhakrishna V.,VNR Vignana Jyothi Institute of Engineering and Technology | Srinivas C.,Kakatiya Institute of Technology | Guru Rao C.V.,SR Engineering College
Procedia Computer Science | Year: 2013

In this paper a generalized approach is proposed for clustering a set of given documents or text files or software components for reuse based on the new similarity function called hybrid XOR function defined for the purpose of finding degree of similarity among two document sets or any two software components. We construct a matrix called similarity matrix of order n-1 by n for n document sets or software components by applying hybrid XOR function for each pair of document sets. We define and design the clustering algorithm which has its input as similarity matrix and output as a set of clusters formed dynamically as compared to other clustering algorithms that predefine the count of clusters and documents being fit to one of those clusters or classes finally. The approach carried out uses simple computations. © 2013 The Authors. Published by Elsevier B.V. Source

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