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Machilipatnam, India

Acharya Nagarjuna University is a university in the region of Namburu, Guntur, Andhra Pradesh, India. It is one of the major universities in the country covering many colleges and institutes of districts in the region. It is located in Nagarjuna Nagar, Namburu on the Northern part of Guntur City, a major centre for learning in the state of Andhra Pradesh.The university is an outgrowth of a post-graduate centre of Andhra University, which was established in 1967 at Nallapadu area of Guntur and then relocated to Nambur/Kaza area on the east of the city. The centre gained affiliating university status in 1976 and opened with ten post-graduate courses. The university is named after Acharya Nagarjuna, the pro-founder of the Madhyamaka path of Mahayana Buddhism. Wikipedia.

Gnaneswara Reddy M.,Acharya Nagarjuna University
Journal of Engineering Physics and Thermophysics | Year: 2015

The unsteady two-dimensional flow of a non-Newtonian fluid over a stretching surface with the effects of thermal radiation and variable thermal conductivity is investigated. The Casson fluid model is used to characterize the non- Newtonian fluid behavior. First, using a similarity transformation, the governing time-dependent partial differential equations are transformed into coupled nonlinear ordinary differential equations with variable coefficients. Then the transformed equations are solved numerically under appropriate boundary conditions by the shooting method. An exact solution corresponding to the momentum equation for a steady case is found. The obtained numerical results are analyzed as to the effect of the pertinent parameters on the flow and heat transfer characteristics. ©2015 Springer Science+Business Media New York. Source

Reddy M.G.,Acharya Nagarjuna University
International Journal of Heat and Technology | Year: 2014

In this analysis, the boundary layer flow and heat and mass transfer over a vertical plate due to a nanofluid with the effects of thermal radiation and uniform heat flux have been investigated. The transport equations used in the analysis took into account the effect of Brownian motion and thermophoresis parameters. Similarity transformation is used to convert the governing non-linear boundary-layer equations into coupled higher order non-linear ordinary differential equations. These equations are numerically solved using fourth order Runge-Kutta method along with shooting technique. An analysis has been carried out to elucidate the effects of governing parameters corresponding to various physical conditions. The dimensionless skin friction increases as the Prandtl number, but decreases as the buoyancy ratio parameter and radiation parameter increases. The reduced Nusselt number increases as the Prandtl number and radiation parameter increase. Comparison with published results is presented. Source

Machireddy G.R.,Acharya Nagarjuna University
Ain Shams Engineering Journal | Year: 2013

The numerical solution of transient natural convection flow of radiation effects on MHD heat and mass transfer past a moving vertical cylinder with chemical reaction is presented. The governing boundary layer equations for the above flow problem of first-order homogeneous chemical reaction are setup and non-dimensionalized. An implicit finite difference method is used to solve the unsteady, non-linear, and coupled governing equations. Numerical results are presented for various parameters. The unsteady velocity, temperature, concentration profiles, local and average skin-friction, Nusselt number, and Sherwood number are shown graphically and are discussed for both generative and destructive reaction. © 2013 Ain Shams University. Production and hosting by Elsevier B.V. All rights reserved. Source

Santhi Kumar R.,Aditya Institute of Technology | Pradeep Kumar T.V.,Acharya Nagarjuna University
International Journal of Theoretical Physics | Year: 2013

A dark energy model with EoS parameter is investigated in f(R,T) gravity in Bianchi type-III space-time in the presence of perfect fluid source. To obtain a determinate solution special law of variation for Hubble's parameter proposed by Berman (Nuovo Cimento B 74:183, 1983) is used. We have also assumed that the scalar expansion is proportional to shear and the EoS parameter is proportional to skewness parameter. It is observed that the EoS parameter, skewness parameters in the model turn out to be functions of cosmic time. Some physical and kinematical properties of the model are also discussed. © 2012 Springer Science+Business Media, LLC. Source

An analytical study for the problem of mixed convection with thermal radiation and first-order chemical reaction on magnetohydrodynamics boundary layer flow of viscous, electrically conducting fluid past a vertical permeable surface embedded in a porous medium has been presented. Slip boundary condition is applied at the porous interface. The heat equation includes the terms involving the viscous dissipation, radiative heat flux, Ohmic dissipation, the internal absorption and absorption of radiation, whereas the mass transfer equation includes the effects of chemically reactive species of first order. The dimensionless governing equations for this investigation are formulated and the non-linear coupled differential equations are solved analytically using the perturbation technique. Comparisons with previously published work on special cases of the problem are performed and results are found to be in excellent agreement. The results obtained show that the velocity, temperature and concentration fields are appreciably influenced by the presence of magnetic field, thermal radiation, chemical reaction and Ohmic dissipation. It is observed that the effect of magnetic field, heat source and thermal radiation is to decrease the velocity, temperature profiles in the boundary layer. The effect of increasing the values of rarefaction parameter is to increase the velocity in the momentum boundary layer. Further, it is found that increasing the value of the chemical reaction decreases the concentration of species in the boundary layer. Also, the effects of the various parameters on the skin-friction coefficient, local Nusselt number and local Sherwood number at the surface are discussed. © Società Italiana di Fisica/Springer-Verlag 2014. Source

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