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Ch Ramana V Murthy - One of the best experts on this subject based on the ideXlab platform.

  • radiation dissipation and dufour effects on mhd free convection flow through a vertical oscillatory Porous Plate with ion slip current
    International Journal of Heat and Technology, 2018
    Co-Authors: K V B Rajakumar, Ch Ramana V Murthy, K S Balamurugan, N Ranganath
    Abstract:

    In this paper, the Dufour, radiation absorption, chemical reaction, and viscous dissipation effects on unsteady magneto hydrodynamic free convective flow through a semi-infinite vertical oscillatory Porous Plate of time-dependent permeability with Hall and ion slip current in a rotating system were investigated. The governing equations of the problem are solved by using Multiple Regular Perturbation law. The possessions of various parameters on velocity, temperature, and concentration are shown graphically.

  • unsteady mhd free convective mass transfer flow past an infinite vertical Porous Plate with variable suction and soret effect
    Asian Journal of Current Engineering and Maths, 2012
    Co-Authors: Ch Ramana V Murthy, Bhaskar N Reddy, G Ramana V Reddy
    Abstract:

    The MHD effects on the unsteady heat convective mass transfer flow past an infinite vertical Porous Plate with variable suction, where the Plate temperature oscillates with the same frequency as that of variable suction velocity with the Soret effects. The governing equations of motion are solved to best possible classical solution by assuming at suitable trial solution. The flow phenomenon has been characterized with the help of flow parameters such as velocity, temperature and concentration profiles for different parameters such as Grashof number (Gr), modified Grashof number (Gm), Schmidt number (Sc), Prandtl number (Pr), Soret number (S0), Magnetic field (M) and variable suction parameter (A). The velocity, temperature and concentration profiles and ski-friction are shown graphically.

  • unsteady free mhd convection flow past a vertical Porous Plate in slip flow regime under oscillatory boundary conditions
    International Journal of Mathematical Archive, 2011
    Co-Authors: Madana Mohana A Rao, G Ramana V Reddy, Ch Ramana V Murthy
    Abstract:

    ABSTRACT The unsteady free convective viscous incompressible flow past an infinite vertical Porous flat Plate with fluctuating heat and mass transfer in slip-flow regime is discussed. Assuming variable suction at the Porous Plate, nearly approximate solutions are obtained for velocity, skin-friction, and temperature and species concentration. The effects of Gr, Gc, Sc, A and ω for Pr = 0.71 (air) have been presented graphically and discussed qualitatively. It is noticed that as Grashof number increases, the velocity of the fluid medium decreases. Also, as modified Grashof number increases, in general the velocity increases. Further, it is seen that as Schmidt number increases, the velocity increases initially within the boundary layer region and thereafter it decreases. It is seen that the magnetic intensity suppresses fluid velocity. Also, increase of the pore size of the fluid bed and Prandtl No causes the fluid velocity to decrease. It is seen that the suction parameter influences temperature significantly and as the suction parameter increases, the temperature field decreases. Further, the concentration of the fluid medium decreases as the suction parameter increases. For a fixed magnetic intensity, as Grashof number increases, the skin friction is found to be increasing. Further, when Grashof number is varied, it is seen that, the skin friction decreases as the magnetic intensity increases. The influence of the amplitude on the velocity profiles is studied. It is noticed that, as the amplitude increases, the fluid velocity decreases and also at times a backward flow is noticed. Due to the percolation of the fluid into the boundary such a backward flow is noticed. However, as we move far away from the bounding surface, the effect of such backward flow is found to be negligible and the influence of amplitude is not seen. Also, it is seen that as B increases while holding Gr constant, the skin friction increases. The relation between skin friction and B is found to be almost linear. Key words: Free Convection, Incompressible Fluid, Heat and Mass Transfer.

Abdus M Sattar - One of the best experts on this subject based on the ideXlab platform.

N Ranganath - One of the best experts on this subject based on the ideXlab platform.

R. A. Mohamed - One of the best experts on this subject based on the ideXlab platform.

  • Unsteady MHD natural convection from a heated vertical Porous Plate in a micropolar fluid with Joule heating, chemical reaction and radiation effects
    Meccanica, 2011
    Co-Authors: Ali J. Chamkha, R. A. Mohamed, Sameh E. Ahmed
    Abstract:

    The effects of Joule-heating, chemical reaction and thermal radiation on unsteady MHD natural convection from a heated vertical Porous Plate in a micropolar fluid are analyzed. The partial differential equations governing the flow and heat and mass transfer have been solved numerically using an implicit finite-difference scheme. The case corresponding to vanishing of the anti-symmetric part of the stress tensor that represents weak concentrations is considered. The numerical results are validated by favorable comparisons with previously published results. A parametric study of the governing parameters, namely the magnetic field parameter, suction/injection parameter, radiation parameter, chemical reaction parameter, vortex viscosity parameter and the Eckert number on the linear velocity, angular velocity, temperature and the concentration profiles as well as the skin friction coefficient, wall couple stress coefficient, Nusselt number and the Sherwood number is conducted. A selected set of numerical results is presented graphically and discussed.

  • influence of chemical reaction and thermal radiation on the heat and mass transfer in mhd micropolar flow over a vertical moving Porous Plate in a Porous medium with heat generation
    International Journal of Thermal Sciences, 2009
    Co-Authors: R. A. Mohamed, S M Abodahab
    Abstract:

    Abstract An analysis is presented for the effects of chemical reaction and thermal radiation on hydromagnetic free convection heat and mass transfer for a micropolar fluid via a Porous medium bounded by a semi-infinite vertical Porous Plate in the presence of heat generation. The Plate moves with a constant velocity in the longitudinal direction and the free stream velocity follows an exponentially small perturbation law. A uniform magnetic field acts perpendicularly to the Porous surface in which absorbs the micropolar fluid with a suction velocity varying with time. Analytical expressions are computed numerically. Numerical calculations are carried out the purpose of the discussion of the results which are shown on graphs and the effects of the various dimensionless parameters entering into the problem on the velocity, angular velocity, temperature, concentration. Also, the results of the skin-friction coefficient, the couple stress coefficient and the rates of the heat and mass transfers at the wall are prepared with various values of fluid properties and the flow conditions are studied.

  • double diffusive convection radiation interaction on unsteady mhd flow over a vertical moving Porous Plate with heat generation and soret effects
    2009
    Co-Authors: R. A. Mohamed
    Abstract:

    The present work analyzes the influence of a first-order homgeneous chemical reaction and thermal radiation on hydromagnetic free convection heat and mass transfer for a viscous fluid past a semi-infinite vertical moving Porous Plate embedded in a Porous medium in the presence of thermal diffusion and heat generation. The fluid is considered to be a gray, absorbing-emitting but non-scattering medium, and the Rosseland approximation is used to describe the radiative heat flux in the energy equation. The Plate moves with constant velocity in the direction of fluid flow while the free stream velocity is assumed to follow the exponentially increasing small perturbation law. A uniform magnetic field acts perpendicular to the Porous surface, which absorbs the fluid with a suction velocity varying with time. The dimensionless governing equations for this investigation are solved analytically using two-term harmonic and non-harmonic functions. The effects of various parameters on the velocity, temperature and concentration fields as well as the skin-friction coefficient, Nusselt number and the Sherwood number are presented graphically and in tabulated forms.

M C Raju - One of the best experts on this subject based on the ideXlab platform.

  • Unsteady MHD Thermal Diffusive and Radiative Fluid Flow Past a Vertical Porous Plate with Chemical Reaction in Slip Flow Regime
    International Journal of Applied Mechanics and Engineering, 2019
    Co-Authors: D. Ravi Kumar, K. Jayarami Reddy, M C Raju
    Abstract:

    Abstract An analytical solution of an MHD free convective thermal diffusive flow of a viscous, incompressible, electrically conducting and heat-absorbing fluid past a infinite vertical permeable Porous Plate in the presence of radiation and chemical reaction is presented. The flow is considered under the influence of a magnetic field applied normal to the flow. The Plate is assumed to move with a constant velocity in the direction of fluid flow in slip flow regime, while free stream velocity is assumed to follow the exponentially increasing small perturbation law. The velocity, temperature, concentration, skin friction, Nusselt number and Sherwood number distributions are derived and have shown through graphs and tables by using the simple perturbation technique.

  • magneto convective flow of a non newtonian fluid through non homogeneous Porous medium past a vertical Porous Plate with variable suction
    Journal of Applied Mathematics and Physics, 2016
    Co-Authors: Harinath S Reddy, M C Raju, Keshava E Reddy
    Abstract:

    Radiation absorption and chemical reaction effects on unsteady MHD free convective flow of a viscoelastic fluid past a vertical Porous Plate in the presence of variable suction and heat source is considered. A uniform magnetic field is assumed to be applied in the transverse direction of the flow. The set of non-linear partial differential equations is transformed into a set of ordinary differential equations by super imposing a solution with steady and unsteady part. The set of ordinary differential equations is solved by using regular perturbation scheme. The expressions for velocity, temperature and species concentration fields are obtained and the expressions for Skin friction, Nusselt number and Sherwood number are also derived. The effects of numerous physical parameters on the above flow quantities are studied with the help of graphs and tables.

  • thermal diffusion effect on mhd mixed convection unsteady flow of a micro polar fluid past a semi infinite vertical Porous Plate with radiation and mass transfer
    International Journal of Engineering Research in Africa, 2014
    Co-Authors: B Mamatha, M C Raju, S V K Varma
    Abstract:

    The present study investigates the thermal diffusion and radiation effects on magneto hydro dynamic mixed convection flow of a micro polar fluid past an infinite, steadily moving Porous Plate with variable suction and constant viscosity. The equations of continuity, linear momentum, angular momentum, energy and diffusion, which govern the flow field, are solved by using a regular perturbation method. The behavior of the velocity, micro rotation, temperature, concentration, skin-friction, Nusselt number, and Sherwood number has been discussed for variations in the physical parameters with the help of the graphs.

  • Radiation absorption effect on MHD, free convection, chemically reacting visco-elastic fluid past an oscillatory vertical Porous Plate in slip flow regime
    2014
    Co-Authors: M C Raju, B. Vidyasagar, S. Venkataramana
    Abstract:

    In this paper an analysis presented to investigate the influence of radiation absorption, chemical reaction and heat source effects on hydro magnetic free convection heat and mass transfer flow of visco-elastic fluid through Porous medium bounded by an oscillating Porous Plate in the slip flow regime with constant suction and temperature dependent heat source. A uniform magnetic field of strength B0 is applied at an angle α with the field flow direction. Analytical solutions for velocity, temperature and concentration are obtained. Skin friction, rate of heat and mass transfer coefficients are also derived. The results have been analyzed and presented graphically for various values of the flow parameters. It is observed that velocity increases with an increase in porosity parameter, radiation absorption, Grashof number, modified Grashof number and it decreases with an increase in magnetic parameter, Schmidt number, chemical reaction parameter, Prandtl number.

  • unsteady mhd free convective visco elastic fluid flow bounded by an infinite inclined Porous Plate in the presence of heat source viscous dissipation and ohmic heating
    International journal of advanced science and technology, 2013
    Co-Authors: M Umamaheswar, S V K Varma, M C Raju
    Abstract:

    The present study deals with an unsteady magneto hydrodynamic free convective, Viscoelastic, dissipative fluid flow embedded in Porous medium bounded by an infinite inclined Porous Plate in the presence of heat source, and Ohmic heating under the influence of transversely applied magnetic field of uniform strength. The equations governing the fluid flow are solved using a multiple parameter perturbation technique, subject to the relevant boundary conditions. Expressions for velocity and temperature distributions are obtained. Non dimensional skin friction coefficient and the rate of heat transfer in the form of Nusselt number are also derived and illustrated using graphs and tables. The effects of various physical parameters on the above flow quantities are discussed.

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