Thermal Diffusion and Chemical Reaction Effects on Unsteady MHD Dusty Viscous Flow

we analysed the soret, radiation and chemical reaction effects on laminar convective flow of a dusty viscous fluid of non conducting walls in presence of transverse magnetic field. The governing equations of the flow are solved by Perturbation Technique. Further, the effects of all physical parameters on the velocities of fluid phase and dust phase, temperature and concentration are analysed and discussed through graphs. Keywords: Dusty Fluid, Laminar flow, MHD, Chemical Reaction, Soret

Hall Current Effects on Free Convection Casson Fluid Flow in a Rotating System with Convective Boundary Conditions and Constant Heat Source

In this paper we investigated an unsteady free convection flow of casson fluid bounded by a moving vertical flat plate in a rotating system with convective boundary conditions. The governing equations are solved analytically by using perturbation technique. Finally the effects of various dimensionless parameters like inclined angle, Casson parameter, Heat source and Suction parameter on velocity, temperature, friction factor and local Nusselt number are discussed with the help of graphs and tables. Through this study, it is found that increasing values of casson parameter reduces the velocity and increase in inclined magnetic field or hall current parameter enhances the velocity profiles. Keywords: Casson fluid, Rotation, inclined magnetic field, MHD, Heat source

A Simple Sol Gel Protocol Towards Synthesis Of Semiconducting Oxide Nanomaterial

Nanostructured Tin oxide (SnO2), powders was synthesized by employing a novel Sol-gel protocol at RT. A wide variety of techniques such as energy – dispersive spectroscopy(EDX), N2 sorption, X-ray diffraction (XRD), have been used to study the formation process and characterization of the nanoparticles obtained. Transmission electron microscopy (TEM) has been applied to find out about the shape and size distribution of the particles. The nanoparticles thus synthesized were monodispersed, with an average particle size of ~ 10 nm and spherical in shape. The EDX analysis revealed the presence of Sn, O signal in the synthesized nanoparticles confirming the purity of the synthesized samples. This protocol appears promising for application in large-scale synthesis of nanoparticles. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/933

Thermophoresis and Brownian motion effects on unsteady MHD nanofluid flow over a slendering stretching surface with slip effects

In the current exploration, a similarity solution is bestowed for hydromagnetic motion of a nanofluid over a slendering stretching sheet with the existence of thermophoresis and Brownian moment. We first altered the time dependent governing mathematical equations into coupled dimensionless differential equations by making use of apposite transmutations. Numerical solution for these equations is procured deploying R.K.-Fehlberg numerical methodology. Further, the impacts of sundry non-dimensional parameters on the flow field along with shear stress, reduced heat and mass transfer have been tackled with the succor of plots and tabular forms. It is worth to divulge that an upturn in the magnitude of thermophoretic and Brownian motion parameters amplifies the fluid temperature, whereas the concentration profiles get depreciated with a hike in thermophoretic parameter. Keywords: MHD, Thermophoresis, Brownian motion, Slendering stretching sheet, Slip effect

Unsteady polar fluid model of blood flow through tapered ω-shape stenosed artery: Effects of catheter and velocity slip

In this paper, we considered the pulsatile flow of blood through catheterized tapered artery in the presence of an ω-shaped stenosis. Blood flow is modelled as homogeneous incompressible couple stress fluid. Further the effects of velocity slip at the arterial wall are also examined. The analysis is carried out analytically and closed form solutions are obtained with the assumption of mild stenosis. In the present study, we analyze the effects of various fluid and geometric parameters on the physiological parameters such as resistance to flow and shear stress at the wall. The variation in the resistance to the flow and wall shear stress with respect to stenosis size (∊,ψ), radius of the catheter (Rc), couple stress fluid parameters (β,ω), Reynolds number (Re) and pulsatile parameter (σ) has been studied. In particular shear stress at the wall is reckoned at both the locations corresponding to the maximum height of the stenosis. It has been observed that this physiological parameter is independent of the location of the maximum height in case of nontapered artery while these locations significantly impact the shear stress at the wall in case of tapered artery. The locations of the critical and maximum heights with corresponding annular radii are summarized in the form of Table 1. We also focussed our attention on the analysis of the wall shear stress over the entire stenosis region for various values of the geometric and fluid parameters. It is observed that the impedance and wall shear stress are increasing with increase in the radius of catheter and stenosis size while they are decreasing as the tapered parameter and the couple stress fluid parameters are increasing. It is observed that slip velocity and diverging tapered artery facilitate the fluid flow

Aligned Magnetic Field, Radiation and Chemical Reaction Effects on Unsteady Dusty Viscous Flow with Heat Generation/Absorption

We analysed the laminar convective flow of a dusty viscous fluid of non conducting walls in presence of aligned magnetic field with volume fraction, radiation, heat absorption along with chemical reaction. The governing equations of the flow are solved by Perturbation Technique. Further, the effects of all physical parameters on the velocities of fluid phase and dust phase, temperature and concentration are analysed and discussed through graphs. Key Words: Dusty Fluid, Laminar flow, MHD, Chemical Reaction, Viscous flow

Combined influence of viscous dissipation and non-uniform heat source/sink on MHD non-Newtonian fluid flow with Cattaneo-Christov heat flux

This paper is perpetrated to inspect the MHD flow and heat transfer of two distinct non-Newtonian fluids across a stretching sheet with the new heat flux theory namely Cattaneo-Christov. Using this model, one can discern the impact of thermal relaxation time. Casson and viscoelastic fluids are supposed for the present perusal. The impacts of frictional heat and irregular heat are accounted. According to the heat variations in the nature or in any other system, the radiation effect on the flows may be linear or nonlinear. So the current investigation is aimed at nonlinear radiation. The flow governing equations have been altered as ODE via appropriate transmutations and then resolved by adopting R-K and Newton calculations. Graphs are displayed to discern the influence of physical parameters entered into the problem. The shear stress and heat transfer coefficients are also tabulated. It is inferred that Casson fluid obtains better velocity compared with viscoelastic fluid. Also, it is essential to disclose that thermal relaxation time exhibits dual behaviour on Casson fluid temperature. Also there is intensification in thermal boundary layer thickness with the enlargement of temperature ratio or frictional heat. Keywords: Non-Newtonian fluid, MHD, Non-uniform heat source/sink, Viscous dissipation, Cattaneo-Christov heat flux model, Nonlinear radiatio

Magnetohydrodynamic Cattaneo-Christov flow past a cone and a wedge with variable heat source/sink

In the present article, the problem of boundary layer flow of MHD electrically conducting fluid past a cone and a wedge with non-uniform heat source/sink along with Cattaneo-Christov heat flux is investigated numerically. At first, the flow equations are converted into ODE via appropriate self similarity transforms and the resulting equations are solved with the assistance of R.-K. and Newton’s methods. The influence of several dimensionless parameters on velocity and temperature fields in addition to the friction factor and reduced heat transfer coefficient has been examined with the support of graphs and numerical values. The heat transfer phenomenon in the flow caused by the cone is excessive when compared to the wedge flow. Also, the thermal and momentum boundary layers are not the same for the flow over a cone and wedge. Keywords: MHD, Non-uniform heat source/sink, Cattaneo-Christov heat flux, Cone and wedg