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Ramachandra Prasad V.,Madanapalle Institute of Technology and Science | Abdul Gaffar S.,Jawaharlal Nehru University | Keshava Reddy E.,Jawaharlal Nehru University | Anwar Beg O.,Gort Engovation Research Aerospace | Krishnaiah S.,Jawaharlal Nehru University
Heat Transfer - Asian Research | Year: 2015

In this article, we investigate the nonlinear steady-state boundary-layer flow, heat and mass transfer of an incompressible Jeffrey non-Newtonian fluid past a vertical porous plate. The transformed conservation equations are solved numerically subject to physically appropriate boundary conditions using a versatile, implicit finite-difference technique. The numerical code is validated with previous studies. The influence of a number of emerging non-dimensional parameters, namely, Deborah number (De), Prandtl number (Pr), ratio of relaxation to retardation times (λ), Schmidt number (Sc), and dimensionless tangential coordinate (ξ) on velocity, temperature, and concentration evolution in the boundary layer regime are examined in detail. Furthermore, the effects of these parameters on surface heat transfer rate, mass transfer rate, and local skin friction are also investigated. It is found that the velocity is reduced with increasing Deborah number whereas temperature and concentration are enhanced. Increasing λ enhances the velocity but reduces the temperature and concentration. The heat transfer rate and mass transfer rates are found to be depressed with increasing Deborah number, De, and enhanced with increasing λ. Local skin friction is found to be decreased with a rise in Deborah number whereas it is elevated with increasing λ. And an increasing Schmidt number decreases the velocity and concentration but increases temperature. © 2013 Wiley Periodicals, Inc. Source


Prasad V.R.,Madanapalle Institute of Technology and Science | Abdul Gaffar S.,Jawaharlal Nehru University | Keshava Reddy E.,Jawaharlal Nehru University | Beg O.A.,Gort Engovation Research Aerospace
Journal of the Brazilian Society of Mechanical Sciences and Engineering | Year: 2015

In this article, we investigate the non-linear steady free convection heat and mass transfer of an incompressible Jeffrey’s non-Newtonian fluid from a permeable horizontal isothermal cylinder in a non-Darcy porous medium. A non-Darcy drag force model is employed to simulate the effects of linear porous media drag and second-order Forchheimer drag. The transformed conservation equations are solved numerically subject to physically appropriate boundary conditions using a versatile, implicit, finite difference technique. The numerical code is validated with previous studies. The influence of a number of emerging non-dimensional parameters, namely Deborah number (De), surface suction parameter (fw), Prandtl number (Pr), ratio of relaxation to retardation times (λ), Darcy number (Da), Forchheimer inertial parameter (Λ) and dimensionless tangential coordinate (ξ) on velocity, temperature and concentration evolution in the boundary layer regime are examined in detail. Furthermore, the effects of these parameters on surface heat transfer rate, mass transfer rate and local skin friction are also investigated. It is observed that velocity decreases with increasing Deborah number and Forchheimer parameter, whereas temperature and concentration are enhanced. Increasing λ and Da enhances velocity but reduces temperature and concentration. The heat transfer rate and mass transfer rate are found to decrease with increasing Deborah number, De, and increase with increasing λ. Local skin friction is found to decrease with a rise in Deborah number whereas it is elevated with increasing values of relaxation to retardation time ratio (λ). Increasing suction decelerates the flow and also cools the boundary layer, i.e., reduces temperature and also concentration. With increasing tangential coordinate, the flow is decelerated; whereas, the temperature and concentration are enhanced. © 2014, The Brazilian Society of Mechanical Sciences and Engineering. Source


Prasad V.R.,Madanapalle Institute of Technology and Science | Gaffar S.A.,Jawaharlal Nehru University | Reddy E.K.,Jawaharlal Nehru University | Beg O.A.,Gort Engovation Research Aerospace
Journal of Porous Media | Year: 2014

In this article, the nonlinear steady state boundary layer flow and heat transfer of an incompressible Eyring-Powell non-Newtonian fluid from a vertical porous plate in a non-Darcy porous medium is investigated. The transformed conservation equations are solved numerically subject to physically appropriate boundary conditions using a secondorder versatile, implicit finite-difference Keller box technique. The numerical code is validated with previous studies. The influence of a number of emerging nondimensional parameters, namely, Eyring-Powell rheological fluid parameters (ε), the local non-Newtonian parameter based on length scale (δ), Prandtl number (Pr), Darcy number (Da), Biot number (Bi), Forchheimer parameter (Λ), and dimensionless tangential coordinate (ζ) on velocity and temperature evolution in the boundary layer regime are examined in detail. Furthermore, the effects of these parameters on surface heat transfer rate and local skin friction are also investigated. Validation with earlier Newtonian studies is presented, and excellent correlation is achieved. It is found that the velocity is reduced with increasing fluid parameter (ε) and Forchheimer parameter (Λ). But temperature is enhanced with increasing fluid parameter and Forchheimer parameter. Increasing fluid parameter 5 is the local non-Newtonian parameter based on length scale x, and the Darcy parameter, Da, enhances the velocity but reduces the temperature. The increasing Biot number, Bi, is observed to enhance both velocity and temperature, and an increasing Prandtl number decreases the velocity and temperature. © 2014 by Begell House, Inc. Source


Prasad V.R.,Madanapalle Institute of Technology and Science | Gaffar S.A.,Jawaharlal Nehru University | Reddy E.K.,Jawaharlal Nehru University | Beg O.A.,Gort Engovation Research Aerospace
International Journal of Computational Methods in Engineering Science and Mechanics | Year: 2014

Polymeric enrobing flows are important in industrial manufacturing technology and process systems. Such flows are non-Newtonian. Motivated by such applications, in this article we investigate the nonlinear steady state boundary layer flow, heat, and mass transfer of an incompressible Jefferys non-Newtonian fluid past a vertical porous plate in a non-Darcy porous medium. The transformed conservation equations are solved numerically subject to physically appropriate boundary conditions using a versatile, implicit, Keller-box finite-difference technique. The numerical code is validated with previous studies. The influence of a number of emerging non-dimensional parameters, namely Deborah number (De), Darcy number (Da), Prandtl number (Pr), ratio of relaxation to retardation times (), Schmidt number (Sc), Forchheimer parameter (Λ), and dimensionless tangential coordinate () on velocity, temperature, and concentration evolution in the boundary layer regime are examined in detail. Furthermore, the effects of these parameters on surface heat transfer rate, mass transfer rate, and local skin friction are also investigated. It is found that the boundary layer flow is decelerated with increasing De and Forchheimer parameter, whereas temperature and concentration are elevated. Increasing and Da enhances the velocity but reduces the temperature and concentration. The heat transfer rate and mass transfer rates are found to be depressed with increasing De and enhanced with increasing . Local skin friction is found to be decreased with a rise in De, whereas it is elevated with increasing . An increasing Sc decreases the velocity and concentration but increases temperature. © 2014 Taylor & Francis Group, LLC. Source


Ramachandra Prasad V.,Madanapalle Institute of Technology and Science | Gaffar S.A.,Salalah College of Technology | Anwar Beg O.,Gort Engovation Research Aerospace
Journal of Applied Fluid Mechanics | Year: 2016

In this article, we investigate the nonlinear steady boundary layer flow and heat transfer of an incompressible Tangent Hyperbolicnon-Newtonian fluid from a vertical porous plate. The transformed conservation equations are solved numerically subject to physically appropriate boundary conditions using a second-order accurate implicit finite-difference Keller Box technique. The numerical code is validated with previous studies. The influence of a number of emerging non-dimensional parameters, namely the Weissenberg number (We), the power law index (n), Prandtl number (Pr), Biot number (γ), and dimensionless local suction parameter(ξ)on velocity and temperature evolution in the boundary layer regime are examined in detail. Furthermore the effects of these parameters on surface heat transfer rate and local skin friction are also investigated. Validation with earlier Newtonian studies is presented and excellent correlation achieved. It is found that velocity, Skin friction and Nusselt number (heat transfer rate) are reduced with increasing Weissenberg number (We), whereas, temperature is enhanced. Increasing power law index (n) enhances velocity and Nusselt number (heat transfer rate) but temperature and Skin friction decrease. An increase in the Biot number (γ) is observed to enhance velocity, temperature, local skin friction and Nusselt number. An increasing Prandtl number, Pr, is found to decrease both velocity, temperature and skin friction but elevates heat transfer rate (Nusselt number). The study is relevant to chemical materials processing applications. Source

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