Annamacharya Institute of Technology and science Autonomous

Rājampet, India

Annamacharya Institute of Technology and science Autonomous

Rājampet, India
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Veeresh C.,Sri Venkateswara University | Varma S.V.K.,Sri Venkateswara University | Vijaya Kumar A.G.,Vellore Institute of Technology | Umamaheswar M.,Annamacharya Institute of Technology and science Autonomous | Raju M.C.,Annamacharya Institute of Technology and science Autonomous
Frontiers in Heat and Mass Transfer | Year: 2017

An analysis is performed to investigate the effects of Joule heating and thermal diffusion on unsteady, viscous, incompressible, electrically conducting MHD heat and mass transfer free convection Casson fluid flow past an oscillating semi-infinite vertical moving porous plate in the presence of heat source/sink and an applied transverse magnetic field. Initially it is assumed that the plate and surrounding fluid at the same temperature and concentration at all the points in stationary condition in the entire flow region. Thereafter a constant temperature is given to the plate hence the buoyancy effect is supporting the fluid to move in upward direction and is assumed that gravity is the only force which acts against to the flow direction. The governing flow is modeled in the form of partial differential equations with initial and boundary conditions. With suitable nondimensional quantities the governing non-linear partial differential equations obtained in dimensionless form, which are solved numerically with finite difference scheme. Numerical results for non-dimensional velocity, temperature and concentration as well as the skin-friciton, the rate of heat transfer and the rate of mass transfer studied for different physical parameters. The results show that the solutal boundary layer thickness of the fluid enhances with the increase of Prandtl number and the temperature is increased by an increase in the heat source by the fluid. The central reason behind this effect is that the heat source causes an increase in the kinetic energy as well as thermal energy of the fluid. The momentum and thermal boundary layers get thinner in case of heat source fluids. © 2017, Global Digital Central. All rights reserved.


Reddy L.R.,Mekapati Rajamohan Reddy Institute of Technology and Science | Raju M.C.,Annamacharya Institute of Technology and science Autonomous | Raju G.S.S.,P.A. College
International Journal of Applied Science and Engineering | Year: 2016

The present study considers an analytical investigation of unsteady MHD free convection flow of a viscoelastic, incompressible, electrically conducting fluid past a vertical porous plate through a porous medium with time dependent oscillatory permeability and suction in presence of a uniform transverse magnetic field. Then effects of radiation, heat generation/absorption, radiation absorption and homogeneous chemical reaction are considered. The novelty of the present study is to analyze the effect of time dependent fluctuate suction and permeability of the medium on a viscoelastic fluid flow in the presence of radiation, heat generation/absorption, radiation absorption and chemical reaction. The coupled nonlinear partial differential equations are turned to ordinary by super imposing solutions with steady and time dependent transient part. Finally, the set of ordinary differential equations are solved with a perturbation scheme to meet the inadequacy of boundary condition. Elasticity of the fluid and the Lorentz force reduce the velocity and it is more pronounced in case of heavier species. Most interesting observation is the fluctuation of velocity appears near the plate due to the presence of sink and presences of elastic element as well as heat source reduce the skin friction. © 2016 Chaoyang University of Technology.


Chandra Reddy P.,Annamacharya Institute of Technology and science Autonomous | Raju M.C.,Annamacharya Institute of Technology and science Autonomous
Advances and Applications in Fluid Mechanics | Year: 2016

In this paper, we have analyzed the diffusion-thermo and thermal diffusion effects on MHD natural convection flow of Rivlin-Ericksen fluid past a semi-infinite vertical plate with constant mass flux numerically. The governing equations related to the problem are reduced to non-dimensional form and solved by using finite-difference method. The influences of several parameters on velocity, temperature and concentration are studied graphically. Variations in skin-friction and Nusselt number are also discussed with the help of tabular values. The temperature rises with increasing values of Df and decreasing values of So. The species concentration increases for increasing values of So, but a reverse effect is found in the case of Df. © 2016 Pushpa Publishing House, Allahabad, India.


Chandra Reddy P.,Annamacharya Institute of Technology and science Autonomous | Raju M.C.,Annamacharya Institute of Technology and science Autonomous
International Journal of Engineering Research in Africa | Year: 2016

This manuscript presents the diffusion thermo and thermo diffusion effects on unsteady MHD natural convection heat and mass transfer flow past an accelerated vertical porous plate in the presence of thermal radiation, variable temperature and also variable concentration. The nondimensional governing equations are solved numerically by using finite difference scheme. The effects of different physical parameters on velocity, temperature and concentration are presented and discussed with the help of graphs. Also the numerical values for local skin friction, Nusselt number and Sherwood number are recorded and analyzed. Increasing values of Soret number results in rising of the concentration, but it falls down under the influence of Dufour number and Schmidt number. Skin friction decreases for increasing values of both Soret and Dufour numbers. © (2016) Trans Tech Publications, Switzerland.


Ravikumar V.,Annamacharya Institute of Technology and science Autonomous | Raju M.C.,Annamacharya Institute of Technology and science Autonomous
Ain Shams Engineering Journal | Year: 2014

The problem of unsteady, two-dimensional, laminar, boundary-layer flow of a viscous, incompressible, electrically conducting and heat-absorbing Rivlin-Ericksen flow fluid along a semi-infinite vertical permeable moving plate in the presence of a uniform transverse magnetic field and thermal buoyancy effect is considered. The plate is assumed to move with a constant velocity in the direction of fluid flow while the free stream velocity is assumed to follow the exponentially increasing small perturbation law. Time-dependent wall suction is assumed to occur at the permeable surface. The dimensionless governing equations for this investigation are solved analytically using two-term harmonic and non-harmonic functions. The obtained analytical results reduced to previously published results on a special case of the problem. Numerical evaluation of the analytical results is performed and some graphical results for the velocity and temperature profiles within the boundary layer are presented. Skin-friction coefficient, Nusselt numbers are also discussed with the help of the graphs. © 2014 Production and hosting by Elsevier B.V. on behalf of Ain Shams University.


Chandra Reddy P.,Annamacharya Institute of Technology and science Autonomous | Raju M.C.,Annamacharya Institute of Technology and science Autonomous | Raju G.S.S.,P.A. College | Varma S.V.K.,A.P.S. University
Frontiers in Heat and Mass Transfer | Year: 2016

The present analysis is focused on free convective heat and mass transfer characteristics of magneto-nanofluid flow through a moving vertical plate in the presence of thermal radiation and thermal diffusion. The water-based nanofluid containing copper is taken into consideration. A uniform magnetic field is applied perpendicular to the plate. The governing equations are solved by applying finite difference method. Numerical results of the fluid velocity, temperature, concentration, shear stress, rate of heat transfer and rate of mass transfer are presented graphically for different values of the physical parameters encountered in the problem. It is noticed that the fluid velocity increases with increasing values of radiation parameter and Soret number. An increase in radiation parameter and solid volume fraction leads to enhance the fluid temperature. Rising values of Soret number serves to improve the species concentration. Increasing values of Schmidt number enhanced the shear stress at the plate but a reverse trend is found in the case of Soret number. The current study is well supported by the verification of a previous result. © 2016, Global Digital Central. All rights reserved.


Nuka M.R.,Annamacharya Institute of Technology and science Autonomous | Naidu M.M.,Andhra University
International Journal of Mobile Network Design and Innovation | Year: 2013

The throughput of a global system for mobile (GSM) communications network is to be maximised for meeting effectively and efficiently the service requirements of ever increasing mobile subscriber's base. The period of temporary storage of subscribers' profiles in visitor location register (VLR) at a mobile switching centre (MSC) affects the throughput of GSM network. This research study proposes a sliding window method for determining the storage period of profiles in VLR that maximises the throughput of GSM network. The proposed method proves to be better than the existing set intersection method. © 2013 Inderscience Enterprises Ltd.


Nuka M.R.,Annamacharya Institute of Technology and science Autonomous | Naidu M.M.,Gudlavalleru Engineering College
International Journal of Wireless and Mobile Computing | Year: 2014

The throughput of a Global System for Mobile Communications (GSM) network is to be maximised for effectively and efficiently meeting the service requirements of the everincreasing mobile subscriber base. The period of temporary storage of subscribers' profiles in the Visitor Location Register (VLR) at a Mobile Switching Centre (MSC) affects the throughput of a GSM network. This research study proposes a sliding window method for determining the storage period of profiles in the VLR, and the principle of optimisation for such a policy is to maximise the throughput and minimise the call set-up time in a GSM network. Copyright © 2014 Inderscience Enterprises Ltd.


Umamaheswar M.,Annamacharya Institute of Technology and science Autonomous | Raju M.C.,Annamacharya Institute of Technology and science Autonomous | Varma S.V.K.,S V University
International Journal of Engineering Research in Africa | Year: 2016

In this manuscript, we have investigated the influence of radiation absorption on an unsteady MHD convective heat and mass transfer flow of a Newtonian fluid past a vertical porous plate in the presence of thermal radiation and chemical reaction. The non dimensional governing equations have been solved by using a multiple perturbation method, subject to the corresponding boundary conditions. The effects of various physical parameters such as velocity, temperature and concentration are studied through graphs. The expressions for local skin friction, Nusselt number and Sherwood number are derived and discussed with the help of a table. It is noticed that velocity increases when an increase in modified Grashof number Gm, radiation absorption parameter χ, Sorret number S0, time t whereas it decreases when an increase in Schmidt number Sc, chemical reaction parameter Kr and radiation parameter F. Temperature increases with an increase in radiation parameter χ and Sorret number S0 whereas it decreases with an increase in chemical reaction parameter Kr, F and ø. Concentration is observed to be decreased when chemical reaction parameter Kr and Schmidt number Sc increase whereas it increases with an increase in Sorret number S0. Skin friction increases with an increase modified Grashof number Gm, radiation parameter χ and Sorret number S0 whereas it has reverse effect in the case of Schmidt number Sc, chemical reaction parameter Kr. Nusselt number increases with an increase in Sc, S0, χ whereas it has reverse effect in the case of Kr. Sherwood number gets decreased when Sc, χ and Kr both are increased whereas it has shown revere effect in the case of S0. © (2016) Trans Tech Publications.


Harinath Reddy S.,Annamacharya Institute of Technology and science Autonomous | Raju M.C.,Annamacharya Institute of Technology and science Autonomous | Keshava Reddy E.,Jawaharlal Nehru Technological University Anantapur
International Journal of Engineering Research in Africa | Year: 2015

Unsteady magneto hydrodynamic (MHD) free convection flow of a viscous, incompressible and electrically conducting, well known non-Newtonian fluid named as Kuvshinski fluid past an infinite vertical porous plate in the presence of homogeneous chemical reaction, radiation absorption and heat source/sink is studied analytically. The plate is assumed to move with a constant velocity in the direction of fluid flow. A magnetic field of uniform strength is applied perpendicular to the plate, which absorbs the fluid with a suction that varies with time. The dimensionless governing equations are solved analytically using two terms harmonic and non-harmonic functions. The expressions for the fields of velocity, temperature and concentration are obtained. With the aid of these the expressions for skin friction, Nusselt number and Sherwood number are derived. The effects of various physical parameters on the flow quantities are studied through graphs and tables. For the validity, we have checked our results with previously published work and found in good agreement. Velocity decreases for an increase in visco elastic parameter α2, heat absorption coefficient φ, the chemical reaction parameter γ, the magnetic field parameter M, the Prandtl number Pr, the Schmidt number Sc, and increases for increase in Grashof number Gm, the radiation absorption parameter Q1. © (2015) Trans Tech Publications.

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