Shakhaoath Khan

Bio: Shakhaoath Khan is an academic researcher from University of Newcastle. The author has contributed to research in topics: Nanofluid & Mechanics. The author has an hindex of 4, co-authored 5 publications receiving 1102 citations. Previous affiliations of Shakhaoath Khan include Khulna University.

Finite difference solution of mhd radiative boundary layer flow of a nanofluid past a stretching sheet

Abstract: Unsteady heat and mass flow of a nanofluid past a stretching sheet with thermal radiation in the presence of magnetic field is studied. To obtain non-similar equation, continuity, momentum, energy and concentration equations have been non-dimensionalised by usual transformation. The non-similar solutions are presented here which depends on the Magnetic parameter M respectively . The obtained equations have been solved by explicit finite difference method. The temperature and concentration profiles are discussed for the different values of the above parameters with different time steps.

Unsteady MHD free convection boundary-layer flow of a nanofluid along a stretching sheet with thermal radiation and viscous dissipation effects

Abstract: In this work, we study the unsteady free convection boundary-layer flow of a nanofluid along a stretching sheet with thermal radiation in the presence of magnetic field. To obtain non-similar equations, continuity, momentum, energy, and concentration equations have been non-dimensionalized by usual transformation. The non-similar solutions are considered here which depend on the magnetic parameter M, radiation parameter R, Prandtl number Pr, Eckert number Ec, Lewis number Le, Brownian motion parameter Nb, thermophoresis parameter Nt, and Grashof number Gr. The obtained equations have been solved by an explicit finite difference method with stability and convergence analysis. The velocity, temperature, and concentration profiles are discussed for different time steps and for the different values of the parameters of physical and engineering interest.

MHD boundary layer radiative, heat generating and chemical reacting flow past a wedge moving in a nanofluid.

Abstract: The present study analyzed numerically magneto-hydrodynamics (MHD) laminar boundary layer flow past a wedge with the influence of thermal radiation, heat generation and chemical reaction. This model used for the momentum, temperature and concentration fields. The principal governing equations is based on the velocity u w (x) in a nanofluid and with a parallel free stream velocity u e (x) and surface temperature and concentration. Similarity transformations are used to transform the governing nonlinear boundary layer equations for momentum, thermal energy and concentration to a system of nonlinear ordinary coupled differential equations with fitting boundary conditions. The transmuted model is shown to be controlled by a number of thermo-physical parameters, viz. the magnetic parameter, thermal convective parameter, mass convective parameter, radiation-conduction parameter, heat generation parameter, Prandtl number, Lewis number, Brownian motion parameter, thermophoresis parameter, chemical reaction parameter and pressure gradient parameter. Numerical elucidations are obtained with the legendary Nactsheim-Swigert shooting technique together with Runge–Kutta six order iteration schemes. Comparisons with previously published work are accomplished and proven an excellent agreement.

Numerical simulation of a non-linear nanofluidic model to characterize the MHD chemically reactive flow past an inclined stretching surface

Abstract: A computational approach is delineated for mass and heat transport enhancement/reduction process to control the drift of nanofluid. The fluid is drifting on the inclined stretched surface. This numerical study demands the resolution of fundamental (conservation momentum, mass transfer, and energy) equations and for which computational proficiency is a challenge. The time-dependent concentration and temperature on the periphery, together with stretched velocity, are the basis of the transient mixed convective laminar nanofluid flow. A similar transformations technique is imposed to adopt a system of time dominated non-linear fundamental equations and transformed it into a differential equation of the ordinary system. It is solved computationally by utilising the scheme of Nactsheim–Swigert shooting along with the iteration process, namely Runge–Kutta of order six. The obtained model depends on diversified natural parameters and is narrated on several profiles. Moreover, an explicit scheme has also been imposed to illustrate the developed visualisation of the fluid flow with the aid of streamlines and isothermal lines. Here, the stretching parameter demonstrates a provoking character on the momentum boundary layer, and the Prandtl number depicts an insignificant minimal impact on the mass transfer flow. The accuracy of this model is found satisfactory by validating with experimental data and comparing it with the previous numerical tests. This investigation has applications in engineering industries in thermal nano-technological materials processing and manufactures.

MHD boundary layer flow and heat transfer characteristics of a nanofluid over a stretching sheet

Abstract: Abstract The study of radiative heat transfer in a nanofluid with the influence of magnetic field over a stretching surface is investigated numerically. Physical mechanisms responsible for magnetic parameter, radiation parameter between the nanoparticles and the base fluid, such as Brownian motion and thermophoresis, are accounted for in the model. The parameters for Prandtl number Pr, Eckert number Ec, Lewis number Le, stretching parameter b/a and constant parameter m are examined. The governing partial differential equations were converted into nonlinear ordinary differential equations by using a suitable similarity transformation, which are solved numerically using the Nactsheim-Swigert shooting technique together with Runge-Kutta six order iteration scheme. The accuracy of the numerical method is tested by performing various comparisons with previously published work and the results are found to be in excellent agreement. Numerical results for velocity, temperature and concentration distributions as well as skin-friction coefficient, Nusselt number and Sherwood number are discussed at the sheet for various values of physical parameters.