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Papers by Shamadhani Begum
A similar unsteady laminar boundary layer model is considered for free convection heat transfer f... more A similar unsteady laminar boundary layer model is considered for free convection heat transfer flow of a Newtonian incompressible past an inclined plate with pressure effect. The similar boundary layer equations are solved numerically by applying Nachtsheim-Swigert shooting iteration technique along with Runge-Kutta sixth order integration method. Two cases of the motion of the flow have been considered such as the plate is impulsive and the other is the uniformly accelerated motion. The plate temperature is assumed to be a function 3348 A. Begum, Md. Abdul Maleque, M. Ferdows, M. Ota of time. Solutions obtained in terms of dimensionless velocity temperature and pressure profiles as well as the local skin-friction and local Nusselt number for the values of governing parameters are presented for both cases .
Numerical heat transfer. Part A. Applications/Numerical heat transfer. Part A, Applications, Jul 1, 2024
International Journal of Heat and Mass Transfer, Oct 1, 2017
Abstract This study aims to investigate the mixed convection stimulated by a uniformly heated mov... more Abstract This study aims to investigate the mixed convection stimulated by a uniformly heated moving lid at the centre of the non-Darcian porous enclosure filled with nanofluid subjected to various wall speed ratios. A nonlinear heating resembling sinusoidal pattern is imposed on the vertical walls, while the horizontal walls are kept adiabatic. The transport equations for fluid and heat are solved using finite volume method with SIMPLE algorithm with a written code. Numerical simulations are carried out for a range of parameters: Richardson number (0.01 ≤ Ri ≤ 1), Darcy number (10 −3 ≤ Da ≤ 10 −5 ), speed ratios (0.5 ≤ λ ≤ 3) and solid volume fraction (0.0 ≤ φ ≤ 0.05). The obtained results showed that the mid-moving lid produces an excellent enhancement in heat transfer rate (92.5%) and thereby yields the highest among the conventional moving boundary lids. Further, the heat transfer performance becomes efficient with high Darcy number, maximum speed ratio and increasing nanoparticle volume fraction.
International Journal of Mechanical Sciences, Sep 1, 2017
Numerical simulation of MHD mixed convection in alumina-water nanofluid filled square porous cavi... more Numerical simulation of MHD mixed convection in alumina-water nanofluid filled square porous cavity using KKL model: Effects of non-linear thermal radiation and inclined magnetic field,
Journal of Porous Media, 2018
International Journal of Heat and Technology, Mar 30, 2015
International Journal of Numerical Methods for Heat & Fluid Flow, Nov 2, 2015
Theoretical approaches were applied to study the effect of magnetic field and heat transfer on th... more Theoretical approaches were applied to study the effect of magnetic field and heat transfer on the flow of blood plasma through an asymmetric arterial segment. The plasma was considered to be unsteady, laminar and an incompressible fluid through non-uniform arterial segment in a two-dimensional flow. Axial velocity, pressure gradient, stream function and pressure shift per wavelength were evaluated in blood plasma flow in arteries by use of coupled linear partial differential equations, solved with the help of Finite difference method. The corresponding initial and boundary conditions were obtained by discretizing the flow channel. The effect of magnetic field on blood plasma in arteries was determined by creating a magnetic field gradient through the application of a varying strength of magnetic field on the flow. Heat transfer characteristics due to applied magnetic field and viscosity of blood was obtained by use of linear partial differential equations to determine varying temperature conditions in heat transfer characteristics. Numerical results for velocity profiles, magnetic profiles and temperature profiles were obtained to characterize blood plasma viscosity by use of various non-dimensional parameters. The results were graphically presented using MATLAB software. The results obtained helped in analyzing theoretically the effects of magnetic field and heat transfer in arterial plasma flow.
Computational Thermal Sciences, 2017
International Journal of Heat and Mass Transfer, 2017
Inclination angle effects on mixed convection heat transfer in a rectangular porous enclosure fil... more Inclination angle effects on mixed convection heat transfer in a rectangular porous enclosure filled by Cu-water nanofluid have been numerically analyzed in the present study. Boundary of the enclosure has sinusoidal heating vertical walls, adiabatic horizontal walls and the heated mid-horizontal moving wall. Control volume method is used to discretize the nonlinear governing differential equations. Richardson number (Ri) from 0.01 to 100, Darcy number (Da) from 10 À3 to 10 À5 , inclination angle (c) from 0°to 90°, solid volume fraction of nanoparticle (u) from 0.0 to 0.2 and porosity (e) of the porous medium from 0.4 to 0.8 are discussed and portrayed in the form of streamlines, isotherms, average Nusselt number and velocity graphs. It is observed that the governing flow parameters has significant impact on the fluid flow and temperature distributions. In particular, the features of enclosure inclination, presence of copper nanoparticles in the fluid-saturated porous media and inserting moving wall at the centre of the enclosure are found to enhance the heat transfer rate.
Nucleation and Atmospheric Aerosols, 2022
Journal of Porous Media, 2019
Heat Transfer - Japanese Research, Feb 26, 2021
In this article, the effects of angle of inclination on heat transfer by mixed convection have be... more In this article, the effects of angle of inclination on heat transfer by mixed convection have been analyzed numerically in a square cavity packed with a CuO nanofluid. Cavity boundaries are constructed by having sinusoidal varying temperature on sidewalls, inactive horizontal walls, and the hot passing plate at the center of the cavity. The transport equations for fluid and heat are solved using the finite‐volume method with SIMPLE algorithm. The Richardson number (Ri) varying from 0.01 to 100, inclination angle (γ) from 0° to 90°, wall speed ratios (λ) from 0 to 3 and volume fraction of nanoparticles (φ) from 0.0 to 0.1 are given and represented in the form of flow fields, temperature fields, and mean heat transfer graphs. It is detected that the principal flow constraints have a substantial impact on the flow lines and thermal lines. Specifically, the structures of cavity inclination, existence of copper nanoparticles, and the hot wall in motion at the midpoint of the cavity are established to enrich the overall rate of heat transfer. Correspondingly, in the present study, the Vajjha and Das model is taken into account for the effective thermal conductivity and viscosity of the nanofluid; application of this model is beneficial for the industries working in a high‐temperature environment.
Journal of Nanofluids
In presents of a magnetic field, an enclosure filled with ferro-particle suspended nanofluid is s... more In presents of a magnetic field, an enclosure filled with ferro-particle suspended nanofluid is subjected to a numerical analysis to investigate natural convective heat transfer. At the center of the enclosure is a heat conducting and generating solid body, and the enclosure is influenced by four different thermal boundary conditions. To solve the governing equation, a Fortran algorithm based on the finite volume approach was created. The numerical approach used in this study produces consistent results for a variety of non-dimensional parameters like Rayleigh number (104 ≤ Ra ≤ 106), Hartmann number (0 ≤ Ha ≤ 100), solid volume fraction (0 ≤ φ ≤ 0.2) and distributed wall temperature. Streamlines, isotherms, and the Nusselt number graph are used to describe the flow and heat transfer properties. Based on this study, It has been noted that improved heat transfer for lower Hartmann number with higher Rayleigh number particularly along sinusoidal wall. For the low Hartmann number, the ...
International Journal of Applied and Computational Mathematics, Jan 11, 2017
This paper is concerned with the study of magnetohydrodynamic mixed convection, axi-symmetric flo... more This paper is concerned with the study of magnetohydrodynamic mixed convection, axi-symmetric flow of Oldroyd-B nanofluid between two infinite isothermal stretching disks. The Brownian motion and thermophoresis diffusion effects are investigated. An exothermal surface reaction is modeled by Arrhenius kinetics, which supplied heat to the Oldroyd-B fluid. Firstly, the flow analysis is modeled and then computed analytically using HAM for the series solution of velocity, temperature and nanoparticle concentration profiles. Graphs are prepared for parametric study to observe the effects of Archimedes number, thermophoresis parameter, activation energy parameter and Brownian motion parameter. The values of Nusselt numbers and Sherwood number are analyzed through tabulated values for both lower and upper disks. It is observed that buoyancy parameter and Brownian motion parameter have significant impact on fluid temperature and nanoparticle concentration. Results also showed that the temperature and nanoparticle concentration are enhanced due to thermophoresis diffusion parameter.
International Journal of Applied and Computational Mathematics
A similar unsteady laminar boundary layer model is considered for free convection heat transfer f... more A similar unsteady laminar boundary layer model is considered for free convection heat transfer flow of a Newtonian incompressible past an inclined plate with pressure effect. The similar boundary layer equations are solved numerically by applying Nachtsheim-Swigert shooting iteration technique along with Runge-Kutta sixth order integration method. Two cases of the motion of the flow have been considered such as the plate is impulsive and the other is the uniformly accelerated motion. The plate temperature is assumed to be a function 3348 A. Begum, Md. Abdul Maleque, M. Ferdows, M. Ota of time. Solutions obtained in terms of dimensionless velocity temperature and pressure profiles as well as the local skin-friction and local Nusselt number for the values of governing parameters are presented for both cases .
Numerical heat transfer. Part A. Applications/Numerical heat transfer. Part A, Applications, Jul 1, 2024
International Journal of Heat and Mass Transfer, Oct 1, 2017
Abstract This study aims to investigate the mixed convection stimulated by a uniformly heated mov... more Abstract This study aims to investigate the mixed convection stimulated by a uniformly heated moving lid at the centre of the non-Darcian porous enclosure filled with nanofluid subjected to various wall speed ratios. A nonlinear heating resembling sinusoidal pattern is imposed on the vertical walls, while the horizontal walls are kept adiabatic. The transport equations for fluid and heat are solved using finite volume method with SIMPLE algorithm with a written code. Numerical simulations are carried out for a range of parameters: Richardson number (0.01 ≤ Ri ≤ 1), Darcy number (10 −3 ≤ Da ≤ 10 −5 ), speed ratios (0.5 ≤ λ ≤ 3) and solid volume fraction (0.0 ≤ φ ≤ 0.05). The obtained results showed that the mid-moving lid produces an excellent enhancement in heat transfer rate (92.5%) and thereby yields the highest among the conventional moving boundary lids. Further, the heat transfer performance becomes efficient with high Darcy number, maximum speed ratio and increasing nanoparticle volume fraction.
International Journal of Mechanical Sciences, Sep 1, 2017
Numerical simulation of MHD mixed convection in alumina-water nanofluid filled square porous cavi... more Numerical simulation of MHD mixed convection in alumina-water nanofluid filled square porous cavity using KKL model: Effects of non-linear thermal radiation and inclined magnetic field,
Journal of Porous Media, 2018
International Journal of Heat and Technology, Mar 30, 2015
International Journal of Numerical Methods for Heat & Fluid Flow, Nov 2, 2015
Theoretical approaches were applied to study the effect of magnetic field and heat transfer on th... more Theoretical approaches were applied to study the effect of magnetic field and heat transfer on the flow of blood plasma through an asymmetric arterial segment. The plasma was considered to be unsteady, laminar and an incompressible fluid through non-uniform arterial segment in a two-dimensional flow. Axial velocity, pressure gradient, stream function and pressure shift per wavelength were evaluated in blood plasma flow in arteries by use of coupled linear partial differential equations, solved with the help of Finite difference method. The corresponding initial and boundary conditions were obtained by discretizing the flow channel. The effect of magnetic field on blood plasma in arteries was determined by creating a magnetic field gradient through the application of a varying strength of magnetic field on the flow. Heat transfer characteristics due to applied magnetic field and viscosity of blood was obtained by use of linear partial differential equations to determine varying temperature conditions in heat transfer characteristics. Numerical results for velocity profiles, magnetic profiles and temperature profiles were obtained to characterize blood plasma viscosity by use of various non-dimensional parameters. The results were graphically presented using MATLAB software. The results obtained helped in analyzing theoretically the effects of magnetic field and heat transfer in arterial plasma flow.
Computational Thermal Sciences, 2017
International Journal of Heat and Mass Transfer, 2017
Inclination angle effects on mixed convection heat transfer in a rectangular porous enclosure fil... more Inclination angle effects on mixed convection heat transfer in a rectangular porous enclosure filled by Cu-water nanofluid have been numerically analyzed in the present study. Boundary of the enclosure has sinusoidal heating vertical walls, adiabatic horizontal walls and the heated mid-horizontal moving wall. Control volume method is used to discretize the nonlinear governing differential equations. Richardson number (Ri) from 0.01 to 100, Darcy number (Da) from 10 À3 to 10 À5 , inclination angle (c) from 0°to 90°, solid volume fraction of nanoparticle (u) from 0.0 to 0.2 and porosity (e) of the porous medium from 0.4 to 0.8 are discussed and portrayed in the form of streamlines, isotherms, average Nusselt number and velocity graphs. It is observed that the governing flow parameters has significant impact on the fluid flow and temperature distributions. In particular, the features of enclosure inclination, presence of copper nanoparticles in the fluid-saturated porous media and inserting moving wall at the centre of the enclosure are found to enhance the heat transfer rate.
Nucleation and Atmospheric Aerosols, 2022
Journal of Porous Media, 2019
Heat Transfer - Japanese Research, Feb 26, 2021
In this article, the effects of angle of inclination on heat transfer by mixed convection have be... more In this article, the effects of angle of inclination on heat transfer by mixed convection have been analyzed numerically in a square cavity packed with a CuO nanofluid. Cavity boundaries are constructed by having sinusoidal varying temperature on sidewalls, inactive horizontal walls, and the hot passing plate at the center of the cavity. The transport equations for fluid and heat are solved using the finite‐volume method with SIMPLE algorithm. The Richardson number (Ri) varying from 0.01 to 100, inclination angle (γ) from 0° to 90°, wall speed ratios (λ) from 0 to 3 and volume fraction of nanoparticles (φ) from 0.0 to 0.1 are given and represented in the form of flow fields, temperature fields, and mean heat transfer graphs. It is detected that the principal flow constraints have a substantial impact on the flow lines and thermal lines. Specifically, the structures of cavity inclination, existence of copper nanoparticles, and the hot wall in motion at the midpoint of the cavity are established to enrich the overall rate of heat transfer. Correspondingly, in the present study, the Vajjha and Das model is taken into account for the effective thermal conductivity and viscosity of the nanofluid; application of this model is beneficial for the industries working in a high‐temperature environment.
Journal of Nanofluids
In presents of a magnetic field, an enclosure filled with ferro-particle suspended nanofluid is s... more In presents of a magnetic field, an enclosure filled with ferro-particle suspended nanofluid is subjected to a numerical analysis to investigate natural convective heat transfer. At the center of the enclosure is a heat conducting and generating solid body, and the enclosure is influenced by four different thermal boundary conditions. To solve the governing equation, a Fortran algorithm based on the finite volume approach was created. The numerical approach used in this study produces consistent results for a variety of non-dimensional parameters like Rayleigh number (104 ≤ Ra ≤ 106), Hartmann number (0 ≤ Ha ≤ 100), solid volume fraction (0 ≤ φ ≤ 0.2) and distributed wall temperature. Streamlines, isotherms, and the Nusselt number graph are used to describe the flow and heat transfer properties. Based on this study, It has been noted that improved heat transfer for lower Hartmann number with higher Rayleigh number particularly along sinusoidal wall. For the low Hartmann number, the ...
International Journal of Applied and Computational Mathematics, Jan 11, 2017
This paper is concerned with the study of magnetohydrodynamic mixed convection, axi-symmetric flo... more This paper is concerned with the study of magnetohydrodynamic mixed convection, axi-symmetric flow of Oldroyd-B nanofluid between two infinite isothermal stretching disks. The Brownian motion and thermophoresis diffusion effects are investigated. An exothermal surface reaction is modeled by Arrhenius kinetics, which supplied heat to the Oldroyd-B fluid. Firstly, the flow analysis is modeled and then computed analytically using HAM for the series solution of velocity, temperature and nanoparticle concentration profiles. Graphs are prepared for parametric study to observe the effects of Archimedes number, thermophoresis parameter, activation energy parameter and Brownian motion parameter. The values of Nusselt numbers and Sherwood number are analyzed through tabulated values for both lower and upper disks. It is observed that buoyancy parameter and Brownian motion parameter have significant impact on fluid temperature and nanoparticle concentration. Results also showed that the temperature and nanoparticle concentration are enhanced due to thermophoresis diffusion parameter.
International Journal of Applied and Computational Mathematics