Personality and learning styles towards the practical-based approach

An enduring question for educational research is the result of individual deviations in the efficacy of learning. The individual learning differences that have been much explored relate to differences in personality, learning styles, strategies and conceptions of learning. This article studies the personality and the learning style profile exhibited by students in a practical based approach of vocational courses. The relationship between personality and learning styles among students was assessed as the students got along through the curriculum. The analysis show that students are more oriented towards an active learning mode in a practical-based approach. Given a specific instruction, some people will learn more effectively than others due to their individual personality and learning styles. This study will help a vocational instructor and advisors to understand their students and to design instruction that can benefit students to accomplish a respectable performance in their learning process

MHD free convection-radiation interaction in a porous medium - part I : numerical investigation

A numerical investigation of two dimensional steady magnetohydrodynamics heat and mass transfer by laminar free convection from a radiative horizontal circular cylinder in a non-Darcy porous medium is presented by taking into account the Soret/Dufour effects. The boundary layer conservation equations, which are parabolic in nature, are normalized into non-similar form and then solved numerically with the well-tested, efficient, implicit, stable Keller–Box finite-difference scheme. We use simple central difference derivatives and averages at the mid points of net rectangles to get finite difference equations with a second order truncation error. We have conducted a grid sensitivity and time calculation of the solution execution. Numerical results are obtained for the velocity, temperature and concentration distributions, as well as the local skin friction, Nusselt number and Sherwood number for several values of the parameters. The dependency of the thermophysical properties has been discussed on the parameters and shown graphically. The Darcy number accelerates the flow due to a corresponding rise in permeability of the regime and concomitant decrease in Darcian impedance. A comparative study between the previously published and present results in a limiting sense is found in an excellent agreement

Unsteady natural convective power-law fluid flow past a vertical plate embedded in a non-Darcian porous medium in the presence of a homogeneous chemical reaction

A numerical solution is presented for unsteady coupled heat and mass transfer by natural convection from a non-Newtonian power-law fluid flow past a vertical plate embedded in a non-Darcian porous medium in the presence of viscous dissipation and chemical reaction effects. The governing equations are formulated and a numerical solution is obtained by using an explicit finite-difference scheme. The solutions at each time step have been found to reach the steady state solution properly. The numerical results are presented in tabular and graphical form to show the effects of material parameters of the problem on the solution

NATURAL CONVECTIVE HEAT TRANSFER ANALYSIS NEAR A MOVING INFINITE VERTICAL POROUS PLATE WITH NEWTONIAN HEATING

The natural convective flow due to heat and mass transfer along an impulsively started vertical porous plate has numerous applications in engineering and technology. For example, water filtration in agriculture engineering, distillation, oil cracking, in nuclear reactors, ionization of liquids, etc. In this thesis, the free convection heat and mass transfer flow past an impulsively started infinite vertical porous plate with Newtonian heating is studied

Effect of Non-Linear Density Variation on Non-Darcy Convective Heat and Mass Transfer with Newtonian Cooling

We investigate the effect of Non-linear density temperature relation on convective heat and mass transfer flow past stretching sheet with Soret and Dufour effects. The Non-linear coupled governing equations have been solved by fourth –order Runge-Kutta method. The velocity, temperature and concentration, skin friction and rate of heat and mass transfer have been discussed for different parametric variations.  We observed that an increase in the density ration γ reduces the velocity, temperature and concentration. Keywords: Heat and Mass transfer, Non-linear temperature relation, Chemical Reaction, Soret and Dufour Effects, Heat sources

Numerical Analysis on the Two-Dimensional Unsteady Magnetohydrodynamic Compressible Flow through a Porous Medium

In the present study, the unsteady magnetrohydrodynamic (MHD) flow of compressible fluid with variable thermal properties has been numerically investigated. The electrically conducting fluid flows through a porous media channel. The uniform magnetic field is applied perpendicular to the direction of the flow. The wall is assumed to be non-conducting and maintained at two different temperatures. The thermal conductivity and viscosity of the fluid change with temperature. Sixth - Order Accurate Compact Finite Difference scheme together with the Third-order Runge-Kutta method is used to solve a set of non-linear equations. The results of the calculation are expressed in the form of the velocity and temperature at different values of the magnetic field and porosity. The proposed mathematical model and numerical methods have been validated by comparing with the results of previously published studies that the compared results reveal the same trends. The difference is due to the compressibility and property variation effects. The results showed that the magnetic field and variable properties considerably influences the flows that is compressible thereby affecting the heat transfer as well as the wall shear stress

Finite element computation of magnetohydrodynamic nanofluid convection from an oscillating inclined plate with radiative flux, heat source and variable temperature effects

The present work describes finite element computations for radiative magnetohydrodynamic convective Newtonian nanofluid flow from an oscillating inclined porous plate with variable temperature. Heat source/sink and buoyancy effects are included in the mathematical model. The problem is formulated by employing Tiwari-Das nanofluid model and two water - based nanofluids with spherical shaped metal nano particles as copper and alumina are considered. The Brinkman and Maxwell-Garnetts models are used for the dynamic viscosity and effective thermal conductivity of the nanofluids respectively. An algebraic flux model, the Rosseland diffusion approximation is adopted to simulate thermal radiative flux effects. The dimensionless, coupled governing partial differential equations are numerically solved via the finite element method with weak variational formulation by imposing initial and boundary conditions with a weighted residual scheme. A grid independence study is also conducted. The finite element solutions are reduced to known previous solutions in some limiting cases of the present investigation and are found to be in good agreement with published work. This investigation is relevant to electromagnetic nanomaterial manufacturing processes operating at high temperatures where radiation heat transfer is significant

Radiation and Chemical Reaction Effects on MHD Flow of Continuously Moving Vertical Surface with Heat and Mass Transfer through Porous Medium with Ohmic Heating

The aim of the present chapter is radiation and viscous dissipation effect to MHD flow with heat and mass transfer from a vertical surface in presence of Ohmic heating, chemical reaction and viscous dissipation has been presented. The governing equations of the momentum, thermal and concentration fields are solved by perturbation technique. The velocity, temperature, concentration and skin friction have been evaluated for variation in the different governing parameters by graphically

Unsteady Hydromagnetic Free Convective Flow Past An Infinite Vertical Porous Plate In Porous Medium

The effect of heat transfer on unsteady hydromagnetic free convective flow of a viscous incompressible electrically conducting fluid flow past an infinite vertical porous plate in presence of constant injection and heat source has been investigated. The flow is subjected to transverse magnetic field. The partial differential equations governing the flow field has been derived and transformed to non-dimensional form. The equations and their respective initial and boundary conditions are then non-dimensionalized and solved numerically using finite difference method specifically, the Crank-Nicolson method. The effects of varying various flow parameters on the velocity, temperature and concentration profiles have been presented in form of graphs. This has been done when Grashof number for heat transfer, Grq>0 (cooling of the plate) and also when Grq<0 (heating of the plate). It has been observed that when the parameters are varied, there is an increase, decrease or no change in velocity, temperature, concentration, skin friction and rate of heat transfer on the surface of the plate. The variation of these parameters especially injection and heat source is very important especially in petroleum engineering where the engineer is able to make various decisions on how to extract fluids as they move through porous medium. Key words: Hydromagnetic, Injection, Porous Medium, Heat Source, Heat transfe

Numerical computation of nonlinear oscillatory two-immiscible magnetohydrodynamic flow in dual porous media system : FTCS and FEM study

The transient Hartmann magnetohydrodynamic (MHD) flow of two immiscible fluids flowing through a horizontal channel containing two porous media with oscillating lateral wall mass flux is studied. A two-dimensional spatial model is developed for the two fluids, one of which is electrically-conducting and the other electrically-insulating (as is the wall in the second region). Both fluid regimes are driven by a common pressure gradient. A Darcy-Forchheimer drag force model is used to simulate the porous medium effects on the flow in both fluid regions. Special boundary conditions are imposed at the interface. The governing second order nonlinear partial differential equations are non-dimensionalized for each region using a set of transformations. The resulting transport equations are shown to be controlled by the Hartmann hydromagnetic parameter (Ha), viscosity ratio parameter (α), two Darcy numbers (Da1, Da2), two Forchheimer numbers (Fs1, Fs2), two Reynolds numbers (Re1, Re2), frequency parameter (εA) associated with the transpiration (lateral wall flux) velocity and a periodic frequency parameter (ω*t*). Numerical FTCS finite difference solutions are obtained for a wide range of the governing parameters. Benchmarking is performed with a Galerkin finite element method code (MAGNETO-FEM) and the results are found to be in excellent agreement. Applications of the model include magnetic cleanup operations in coastal/ocean seabed oil spills and electromagnetic purification of petroleum reservoir fluids