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Najma Saleem

Bio: Najma Saleem is an academic researcher from Prince Mohammad bin Fahd University. The author has contributed to research in topics: Heat transfer & Nanofluid. The author has an hindex of 10, co-authored 34 publications receiving 317 citations. Previous affiliations of Najma Saleem include College of Business Administration & Quaid-i-Azam University.

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TL;DR: In this paper, the magnetic peristaltic flow of a Carreau fluid in a channel with different wave forms was analyzed in the presence of an induced magnetic field, and mathematical expressions of stream function, magnetic force function and axial induced magnetic fields were constructed.
Abstract: Magnetohydrodynamic (MHD) peristaltic flow of a Carreau fluid in a channel with different wave forms are analyzed in this investigation. The flow analysis is conducted in the presence of an induced magnetic field. Long wavelength approach is adopted. Mathematical expressions of stream function, magnetic force function and an axial induced magnetic field are constructed. Pressure rise and pumping phenomena are described.

80 citations

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TL;DR: In this paper, the effect of an induced magnetic field on peristaltic flow of an incompressible Carreau fluid in an asymmetric channel is analyzed and perturbation solution to equations under long wavelength approximation is derived in terms of small Weissenberg number.
Abstract: The effect of an induced magnetic field on peristaltic flow of an incompressible Carreau fluid in an asymmetric channel is analyzed. Perturbation solution to equations under long wavelength approximation is derived in terms of small Weissenberg number. Expressions have been constructed for the stream function, the axial induced magnetic field, the magnetic force function, the current density distribution and the temperature. Trapping phenomenon is examined with respect to emerging parameters of interest.

36 citations

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TL;DR: In this paper, water-based hybrid nanofluid is used to investigate mixed convection in a squared enclosure heated with a circular center heater, where the cavity is placed inclined under the uniform inclined magnetic field.
Abstract: The hybrid nanofluids have efficient thermal networking due to the trade-off between the pros and cons of the more than one type of suspension. In the current study, water-based hybrid nanofluid is used to investigate mixed convection in a squared enclosure heated with a circular center heater. The cavity is placed inclined under the uniform inclined magnetic field. The squared cavity comprises of two adiabatic vertical walls and two cold horizontal walls. The governing equations are normalized using a suitable set of variables and are solved with the finite element method. A comparison is provided with previously reported results at limiting case. The grid independence is examined for the Nusselt number at the central heater. The analysis reveals the effective role of the concentration of hybrid nanofluid particles in enhancing the heat spread. The results indicate that adding 2% concentration of Ag-MgO hybrid nanoparticles causes an 18.3% uprise in the Nusselt number at the central heater. The heat transfer rate enhances for increasing Hartmann number between 0 and 10 but decreases over 10. For better heat transfer augmentation, a heater with a smaller radius is recommended for the free convection. In contrast, a heater with a larger radius serves the purpose in case of forced convection.

25 citations


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350 citations

Journal ArticleDOI
TL;DR: In this article, the effect of magnetic field on heat transfer of Al 2 O 3 -water nanofluid in a two-dimensional horizontal annulus was investigated using the lattice Boltzmann method.
Abstract: In this study the lattice Boltzmann method is applied to investigate the effect of magnetic field on natural convection heat transfer of Al 2 O 3 –water nanofluid in a two-dimensional horizontal annulus. In this model, the effect of Brownian motion on the effective thermal conductivity is also considered. The effective thermal conductivity and the effective viscosity of nanofluid are calculated by KKL (Koo–Kleinstreuer–Li) correlation. The effect of nanoparticle volume fraction for the enhancement of heat transfer was examined for several sets of values of Rayleigh and Hartmann numbers. Also, a correlation of the Nusselt number with physical parameters is presented. The obtained results indicate that the value of the maximum stream function decreases with increasing Hartmann number. Furthermore, we notice that the Nusselt number has a direct relationship with the Rayleigh number; but quite the opposite is true with the Hartmann number. The obtained results indicate that the Lattice Boltzmann method with double-population is a powerful approach for the simulation of natural convection heat transfer in nanofluids in regions with curved boundaries.

163 citations

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TL;DR: In this article, the peristaltic flow of a Jeffrey fluid in a vertical porous stratum with heat transfer is studied under long wavelength and low Reynolds number assumptions, and the nonlinear governing equations are solved using perturbation technique.
Abstract: The peristaltic flow of a Jeffrey fluid in a vertical porous stratum with heat transfer is studied under long wavelength and low Reynolds number assumptions. The nonlinear governing equations are solved using perturbation technique. The expressions for velocity, temperature and the pressure rise per one wave length are determined. The effects of different parameters on the velocity, the temperature and the pumping characteristics are discussed. It is observed that the effects of the Jeffrey number λ 1 , the Grashof number Gr, the perturbation parameter N = EcPr, and the peristaltic wall deformation parameter ϕ are the strongest on the trapping bolus phenomenon. The results obtained for the flow and heat transfer characteristics reveal many interesting behaviors that warrant further study on the non-Newtonian fluid phenomena, especially the shear-thinning phenomena. Shear-thinning reduces the wall shear stress.

143 citations

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TL;DR: In this paper, the authors investigated the magnetic force and nonlinear thermal radiation on hybrid bio-nanofluid flow in a peristaltic channel under the influence of an applied magnetic field with high and low Reynolds number.
Abstract: This work investigates the magnetic force and nonlinear thermal radiation on hybrid bio-nanofluid flow in a peristaltic channel under the influence of an applied magnetic field with high and low Reynolds number. Gold and copper nanoparticles are taken into account. Momentum, Maxwell, and heat with nonlinear thermal radiation and heat source think equations are considered in the dimensionless form without any approximation as a system of nonlinear partial differential equations. The expressions of velocity, induced magnetic field components, magnetic pressure, stream function, magnetic force, joule heating, shear stress, and Nusselt number have been obtained using the Adomian decomposition method. Influences of miscellaneous physical and biomedical parameters including moderate Reynolds, magnetic Reynolds, hybrid nanofluid volume fraction, Hartmann, dimensionless wavenumber, electric field stress, nonlinear thermal radiation, and internal heat generation absorption parameters on velocity, induced magnetic field components, magnetic pressure, normal component of the pressure gradient, heat distribution shear stress on the walls and Nusselt number are plotted and examined. During the investigation, it is found that the gold nanofluid has the highest velocity compared with hybrid, copper, and base fluid, while the hybrid nanofluid has a high magnetic force. The nonlinear thermal radiation is rising the heat distribution for hybrid nanofluid

114 citations

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TL;DR: In this paper, the effects of nonlinear thermal radiation and non-uniform heat source/sink in unsteady three-dimensional flow of Carreau and Casson fluids past a stretching surface in the presence of homogeneous-heterogeneous reactions are investigated.
Abstract: In this study, we investigated the effects of nonlinear thermal radiation and non-uniform heat source/sink in unsteady three-dimensional flow of Carreau and Casson fluids past a stretching surface in the presence of homogeneous–heterogeneous reactions. The transformed governing equations are solved numerically using Runge–Kutta based shooting technique. We obtained good accuracy of the present results by comparing with the already published literature. The influence of dimensionless governing parameters on velocity, temperature and concentration profiles along with the friction factors, local Nusselt and Sherwood numbers is discussed and presented graphically. We presented dual solutions for flow, heat and mass transfer in Carreau and Casson fluids. It is found that the heat and mass transfer rate in Casson fluid is significantly high while compared with the Carreau fluid.

106 citations