D. Srinivasacharya
National Institute of Technology, Warangal
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Featured researches published by D. Srinivasacharya.
International Journal of Engineering Science | 2001
D. Srinivasacharya; J. V. Ramana Murthy; D. Venugopalam
In this paper, we consider the unsteady flow of incompressible micropolar fluid between two parallel porous plates when there is a periodic suction at the lower plate and injection at the upper plate. Stream function for the flow is obtained and the effects of microrotation parameter and frequency parameter on skin friction at the lower and upper plates are numerically studied.
Applied Nanoscience | 2015
D. Srinivasacharya; O. Surender
The effect of thermal and mass stratification on mixed convection boundary layer flow over a vertical flat plate embedded in a porous medium saturated by a nanofluid has been investigated. The vertical plate is maintained at uniform and constant heat, mass and nanoparticle fluxes, and the behavior of the porous medium is described by the Darcy model. The model considered for nanofluids incorporates the effects of Brownian motion and thermophoresis. In addition, the thermal energy equations include regular diffusion and cross-diffusion terms. A suitable coordinate transformation is introduced, and the obtained system of non-similar, coupled and non-linear partial differential equations is solved numerically. The influence of pertinent parameters on the non-dimensional velocity, temperature, concentration and nanoparticle volume fraction are discussed. In addition, the variation of heat, mass and nanoparticle transfer rates at the plate are exhibited graphically for different values of physical parameters.
Applied Mathematics and Computation | 2004
D. Srinivasacharya; I. Rajyalakshmi
The creeping flow of incompressible micropolar fluid past a porous sphere with permeability k is studied assuming uniform flow far away from the body. The stream function is determined by matching the solutions of Stokes equations for the flow outside the sphere with that of the Brinkman equations inside the porous sphere. The drag force experienced by the sphere is determined. The variation of drag and the streamline pattern for different values of the permeability parameter (@h), the coupling number (N) and the micropolar parameter (m) is studied numerically. It is observed that the drag on the porous sphere, when the fluid is micropolar is more than that of the Newtonian fluid case. The flow pattern depends on the permeability k as in the case of Newtonian fluid and on the coupling number (N) but not on the micropolar parameter (m).
International Journal of Engineering | 2014
D. Srinivasacharya; O. Surender
This paper presents the nonsimilarity solutions for mixed convection heat and mass transfer along a semi-infinite vertical plate embedded in a doubly stratified fluid saturated porous medium in the presence of Soret and Dufour effects. The flow in the porous medium is described by employing the Darcy-Forchheimer based model. The nonlinear governing equations and their associated boundary conditions are initially cast into dimensionless forms and then solved numerically. The influence of pertinent parameters on dimensionless velocity, temperature, concentration, heat, and mass transfer in terms of the local Nusselt and Sherwood numbers is discussed and presented graphically.
International Journal of Biomathematics | 2012
D. Srinivasacharya; D. Srikanth
In this paper, the flow of blood through catheterized artery with mild constriction at the outer wall is considered. The closed form solutions are obtained for velocity and microrotation components. The impedance (resistance to the flow) and wall shear stress are calculated. The effects of catheterization, coupling number, micropolar parameter, and height of the stenosis on impedance and wall shear stresses are discussed.
Journal of Heat Transfer-transactions of The Asme | 2011
D. Srinivasacharya; Ch. RamReddy
This paper analyzes the flow and heat and mass transfer characteristics of the free convection on a vertical plate with uniform and constant heat and mass fluxes in a doubly stratified micropolar fluid. The nonlinear governing equations and their associated boundary conditions are initially cast into dimensionless forms by pseudosimilarity variables. The resulting system of equations is then solved numerically using the Keller-box method. The numerical results are compared and found to be in good agreement with previously published results on special cases of the problem. The obtained results are displayed graphically to illustrate the effect of the micropolar and stratification parameters on the dimensionless velocity, microrotation, wall temperature, and wall concentration. The numerical values of the skin friction, wall couple stress, and heat and mass transfer rates for different values of governing parameters are also tabulated.
Advances in High Energy Physics | 2015
Ch. RamReddy; T. Pradeepa; D. Srinivasacharya
The free convective flow of an incompressible micropolar fluid along permeable vertical plate under the convective boundary condition is investigated. The Lie scaling group of transformations is applied to get the similarity representation for the system of partial differential equations and then the resulting systems of equations are solved using spectral quasi-linearisation method. A quantitative comparison of the numerical results is made with previously published results for special cases and the results are found to be in good agreement. The results of the physical parameters on the developments of flow, temperature, concentration, skinfriction, wall couple stress, heat transfer, and mass transfer characteristics along vertical plate are given and the salient features are discussed.
International Journal for Computational Methods in Engineering Science and Mechanics | 2012
D. Srinivasacharya; J. Pranitha; Ch. RamReddy
In this paper, effects of magnetic field and double dispersion on free convection heat and mass transfer along a vertical plate embedded in a doubly stratified non-Darcy porous medium saturated with power-law fluid is considered. The governing partial differential equations are transformed into ordinary differential equations using similarity transformations and then solved numerically. The numerical results are compared and found to be in good agreement with previously published results as special cases of the present investigation. The effects of magnetic parameter, dispersion parameters, and power-law index on the velocity, temperature, and concentration are illustrated graphically.
Journal of The Brazilian Society of Mechanical Sciences and Engineering | 2012
D. Srinivasacharya; G. Swamy Reddy
The effects of double diffusive natural convection heat and mass transfer along a vertical plate embedded in a power-law fluid saturated Darcy porous medium in the presence of Soret and Dufour effects are studied. The governing partial differential equations are transformed into ordinary differential equations using similarity transformations and then solved numerically. A parametric study of the physical parameters involved in the problem is conducted and a representative set of numerical results is illustrated graphically.
Journal of The Brazilian Society of Mechanical Sciences and Engineering | 2011
D. Srinivasacharya; J. Pranitha; Ch. RamReddy
Natural convection heat and mass transfer along a vertical plate embedded in a doubly stratified power-law fluid saturated non-Darcy porous medium with uniform heat and mass flux is presented. The governing partial differential equations are transformed into ordinary differential equations using similarity transformations and then solved numerically. The effects of magnetic parameter, stratification parameter and power-law index on the velocity, temperature and concentration are illustrated graphically.