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Rama Narasimha K.,Bangalore University | Rajagopal M.S.,Global Academy of Technology | Seetharamu K.N.,Pes Institute Of Technology
Journal of Applied Fluid Mechanics | Year: 2012

An experimental study on pulsating heat pipe (PHP) is presented in this work. A closed loop PHP with a single U turn is fabricated and tested. The transient and steady state experiments are conducted and operating temperatures are measured. The experiments are carried out for different working fluids, heat input and for different evacuation levels. The derived parameters include thermal resistance and heat transfer coefficient of PHP. The results of these experiments show an intermittent motion of the working fluid at lower heat input. The temperature difference between evaporator and condenser at steady state is found lower for acetone compared to water, ethanol and methanol. Lower value of thermal resistance and higher value of heat transfer coefficient are observed in case of acetone compared to water, ethanol and methanol. Lower values of temperature difference between evaporator and condenser and thermal resistance and higher value of heat transfer coefficient are observed at atmospheric conditions of operation of PHP compared to evacuation conditions. The Power Spectral Density Analysis is also carried out on the results of these experiments using FFT technique to analyse the pulsating motion of the fluid in a PHP. In the Power Spectral Density analysis, the frequency distribution of temperature variation in PHP was observed over a wider range, signifying the periodic motion in the fluid flow of the liquid slug and vapour plug. This characteristic frequency corresponded to the characteristic time for a couple of adjacent vapour plug and liquid slug passing through a specific local wall surface in a PHP.


Suma N.,Global Academy of Technology | Prakash B.S.J.,Bangalore Institute of Technology
Silicon | Year: 2011

Oxidation of trichloroethylene and derivatives of phenol, which are toxic compounds present in water, to harmless species has been carried out in the presence of modified clays such as HDTMA-immobilized-interlayer-Mn(VII) (surfactant immobilized manganate clay) and M n+-bent-Mn (VII) (metal cations like Al, Cr, Fe, Cu, Ni, Mn & Zn impregnated on manganate clays), by treating the toxic compounds with HDTMA-immobilized-interlayer-Mn(VII) clay and M n+-bent-Mn (VII) clays. The oxidation reaction was monitored by measuring the absorbance after every hour using a UV-Visible spectrophotometer at a definite wavelength. © 2010 Springer Science+Business Media B.V.


Prakash Rao C.R.,Global Academy of Technology | Narendraviswanath N.,Global Academy of Technology
Procedia Engineering | Year: 2014

Metal matrix composites being used in automobile, aviation, naval, space and other structural applications because of their unique balance of physical and mechanical properties. The metal matrix composites are produced using diverse technologies in order to meet the market demand such as lower density, higher wear resistance, thermal stability at lower cost per component. Composite materials replace almost all the monolithic material while posing challenges for machining hence are graded as difficult to machine materials. The hetrogeneous structure of the composite materials leads to the failure of cutting tool during machining composites are mainly attributed for the presence of hard particles which leads to higher surface roughness value. Thus, present paper presents the results on surface roughness values of K10 grade carbide and Poly Crystaline Diamond (PCD) inserts while turning Al6061-flyash composites containing 0% to 15% fly ash in step of 5%. Parametric studies have been carried out as per ISO3685 standards following dry machining condition. The machining parameters are cutting speeds of 300m/min to 600m/min in step of 100m/min, feed of 0.06mm/revolution to 0.24mm/revolution in step of 0.06mm/revolution using a constant depth of cut of 1.2 mm which is equal to three times to the nose radius of the cutting tool. The results revealed that PCD inserts exhibits lower surface roughness while turning composites containing 10% filler material when compared with that of K10 grade tungsten carbide insert. © 2014 The Authors.


Mayaja N.A.,Atria Institute of Technology | Srinivasa C.V.,Global Academy of Technology
Proceedings of the 16th International Association for Mathematical Geosciences - Geostatistical and Geospatial Approaches for the Characterization of Natural Resources in the Environment: Challenges, Processes and Strategies, IAMG 2014 | Year: 2014

Kerala, one of the smallest States of South India, is blessed with forty-four rivers. River Pampa is the third largest river in the State of Kerala, 176km long with a catchment area of 2235Sq. km. Recurring tropical monsoon floods during every season, causing substantial damages, is one of the perennial problems experienced in this river basin. Studying rainfall trend in the river basin and its underlying features are vital in understanding the flood phenomena and its socio-economic impacts. The present study evaluates the trend of rainfall in the Pampa river basin, utilizing the data from five gauging stations. The time series of monthly and annual rainfalls for the past twenty two years have been analyzed statistically. Significant changes have been observed in the basin rainfall features - both seasonal and annual rainfall. © 2014, Capital Publishing Company.


Mayaja N.A.,Atria Institute of Technology | Srinivasa C.V.,Global Academy of Technology
Proceedings of the 16th International Association for Mathematical Geosciences - Geostatistical and Geospatial Approaches for the Characterization of Natural Resources in the Environment: Challenges, Processes and Strategies, IAMG 2014 | Year: 2014

The basin characteristics of Pampa River-the third largest river of the State of Kerala, flowing through the heart of central region of the State-has undergone tremendous variations in the recent past. Alternating cycles of recurring flood and drought has become a predominant feature of this river, which, once used to be a rich and sustainable source of water throughout the seasons and lifeline for a population. The rapid pace of urbanization, massive encroachment of river banks, deforestation, transition in the agricultural pattern etc transformed the land use pattern of this river basin. A large number of villages and densely populated regions on the bank of this river face the ravage of flood every year. In this context, this study attempts to evaluate the land use and land cover (LULC) changes occurred in Pampa river basin during the last decade i.e., 2001-2010, identify the human intervention factors as well as the possible impacts of these factors on the floods occurring in this river basin. © 2014, Capital Publishing Company.


Anil P.N.,Global Academy of Technology | Natarajan S.,PES Institute of Technology
ICMLC 2010 - The 2nd International Conference on Machine Learning and Computing | Year: 2010

Road Extraction from satellite imagery is of fundamental importance in the context of spatial data capturing and updating for GIS applications. As fully automatic method for feature extraction is difficult due to the increasing complexity of objects. This paper proposes a semi-automatic road extraction methodology from high resolution satellite imagery using active contour model (Snakes). First the image is preprocessed using relaxed median filter. In the next step the user inputs initial seed points on the road to be extracted. Then the road segment is extracted using active contour model. The method is tested using high resolution satellite imagery and the results are presented in the paper. © 2010 IEEE.


Preethi B.,Global Academy of Technology | Sumangala B.V.,National Institute of Technology Jalandhar
Lecture Notes in Electrical Engineering | Year: 2014

This paper presents the analysis of the FACTS device-thyristor-switched capacitor (TSC) connected on the secondary terminals of the distribution feeder (transformer) in a power system network for effective voltage stability and reactive power control. The FACTS device is advantageous over the mechanical switch operated capacitors in the aspects of faster control, improved system performance, and system voltage stability. The power system network simulations are carried out, and the model of the TSC is realized for a 220 kV transmission line system using Simulink in MATLAB. © 2014 Springer India.


Kangavalli R.,Global Academy of Technology | Vagdevi S.,Global Academy of Technology
Souvenir of the 2015 IEEE International Advance Computing Conference, IACC 2015 | Year: 2015

Cloud computing has been considered as the architectural model for future generation Information Technology. Inspite of its numerous advantages in both technical and business aspects, cloud computing still poses new challenges particularly in data storage security. The main threat here is trustworthiness. Data centers which power a cloud cannot perform computations on encrypted data stored on cloud. With the advances in homomorphic encryption techniques, data stored in cloud can be analyzed without decryption of the entire data. This paper discusses about various homomorphic encryption schemes and their applications on various domains. A homomorphic method with byte level homomorphism has been proposed. © 2015 IEEE.


Pramada P.,Global Academy of Technology | Gowrishankara C.K.,Satellite Center
Proceedings of IEEE International Conference on Circuit, Power and Computing Technologies, ICCPCT 2013 | Year: 2013

Solar Array Simulator (SAS) is a special kind of DC power supply to simulate the solar array voltage-current characteristics. SAS provides V-I characteristics of solar array for ground testing of complete spacecraft or spacecraft power subsystem. The Solar Array Simulator (SAS) is based on SMPS concept and it gives the switching response to voltage regulator operating at 25 KHz. The SAS is highly efficient and thermal design issues are minimal. This paper describes the complete working principle of the circuit, its simulation analysis and development of SAS. © 2013 IEEE.


Hanji B.R.,Global Academy of Technology | Shettar R.,Global Academy of Technology
2015 International Conference on Computer Communication and Informatics, ICCCI 2015 | Year: 2015

Mobile Ad Hoc Network [MANET] is a network that changes location and organize itself on the fly. The low resource availability demands efficient utilization and motivates optimal routing. This paper introduces an Improved AODV (I-AODV) protocol which considers the location and energy of nodes. Route discovery area is restricted based on the source and destination location. The nodes lying in this region are considered for routing. In the proposed method one hop communication takes place when the two nodes lie in the communicating range of each other. If the communicating nodes are far away then the intermediate nodes lying within the 75% communication range of source and having the distance between the selected intermediate node and destination less than other intermediate nodes distance with destination node are selected. The selected intermediate node is also checked for having energy greater than threshold energy which increases the lifetime of the path. Nodes involved in one communication session are not involved in other communication session, since participation of a node in more than one session will drain out energy soon leading to path break. The other nodes out of region do not participate in the routing process. The basic AODV protocol is compared with the proposed Improved-AODV (I-AODV) protocol considering the three metrics: packet delivery ratio, routing overhead & control overhead and energy consumption. The simulation results show that there is an average improvement of 6.72 times in packet delivery ratio, an average improvement of 1.58 times on routing and control overhead and 14.67 times of average reduction in terms of energy consumption with respect to basic AODV protocol. © 2015 IEEE.

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