Unsteady axisymmetric flow and heat transfer over time-dependent radially stretching sheet

AbstractThis article address the boundary layer flow and heat transfer of unsteady and incompressible viscous fluid over an unsteady stretching permeable surface. First of all modeled nonlinear partial differential equations are transformed to a system of ordinary differential equations by using similarity transformations. Analytic solution of the reduced problem is constructed by using homotopy analysis method (HAM). To validate the constructed series solution a numerical counterpart is developed using shooting algorithm based on Runge-Kutta method. Both schemes are in an excellent agreement. The effects of the pertinent parameters on the velocity and energy profile are shown graphically and examined in detail

Heat and mass transfer in unsteady rotating fluid flow with binary chemical reaction and activation energy

In this study, the Spectral Relaxation Method (SRM) is used to solve the coupled highly nonlinear system of partial differential equations due to an unsteady flow over a stretching surface in an incompressible rotating viscous fluid in presence of binary chemical reaction and Arrhenius activation energy. The velocity, temperature and concentration distributions as well as the skin-friction, heat and mass transfer coefficients have been obtained and discussed for various physical parametric values. The numerical results obtained by (SRM) are then presented graphically and discussed to highlight the physical implications of the simulations

Viscous dissipation and Joule heating effects on an unsteady magnetohydrodynamic flow over a linearly stretching permeable surface with uniform wall temperature

An analysis has been presented to describe the effects of viscous dissipation and Joule heating on an unsteady laminar two-dimensional flow of a viscous incompressible electrically conducting fluid over a stretching permeable surface in the presence of a uniform transverse magnetic field. Similarity solutions for the problem have been formulated and reduced nonlinear ordinary differential equations have been solved numerically using fourth order Runge-Kutta method with shooting technique. Influences of various parameters, namely, mass transfer parameter, unsteadiness parameter, magnetic parameter, Prandtl numberand Eckert number on velocity and temperature distributions have been plotted graphically while skin-friction coefficient and Nusselt number have been shown numerically. A comparison of the obtained numerical results has been made with previously published results for non-magnetic case

Heat and Hall Effect of an Oscillating Plate in a Porous Medium

An exact solution of the flow of heat and viscous fluid on a porous plate by using perturbation is obtained for the conjugate problem of an electrically conducting fluid in the presence of strong magnetic field by introducing the Hall currents. The fluid half-space is considered to be porous. Large time solution and effects of porous medium are discussed. It was shown that Hall Effect setup an opposing force which reduces the velocity. Temperature and velocity distributions have been obtained and the effect of various values of nondimensional physical parameters on streamline patterns and skin friction coefficient and Nusselt number are presented and discusse

Physical aspects of computing the flow of a viscous fluid

One of the main themes in fluid dynamics at present and in the future is going to be computational fluid dynamics with the primary focus on the determination of drag, flow separation, vortex flows, and unsteady flows. A computation of the flow of a viscous fluid requires an understanding and consideration of the physical aspects of the flow. This is done by identifying the flow regimes and the scales of fluid motion, and the sources of vorticity. Discussions of flow regimes deal with conditions of incompressibility, transitional and turbulent flows, Navier-Stokes and non-Navier-Stokes regimes, shock waves, and strain fields. Discussions of the scales of fluid motion consider transitional and turbulent flows, thin- and slender-shear layers, triple- and four-deck regions, viscous-inviscid interactions, shock waves, strain rates, and temporal scales. In addition, the significance and generation of vorticity are discussed. These physical aspects mainly guide computations of the flow of a viscous fluid

Effectiveness of glass as a substitute for cement and fine aggregate in concrete mix

Construction field is a field that is wider than the other fields. The construction is becoming increasingly rapidly to meet the growing population. In the field of construction, concrete is an essential element to construct a building. Production of concrete leads to a reduction in natural resources as materials used in producing a concrete. For example of fine aggregate and cement. Furthermore, this problem gets attention from some parties in finding an alternative to reduce waste and maintained the natural resources to produce concrete using waste materials. Therefore, waste materials will be used in the concrete mix to reduce landfill and can reduce residual waste. Glass has high potential to be replaced as a cement-pozzolan [1]. Glass can be used in concrete as three kinds of elements include coarse aggregate, fine aggregate, and powder. Thus, the aim of this project is to replace glass as the replacement of cement and fine aggregate in concrete. In significant of this study, the issues regarding environmental can be reduced. Moreover, recycling waste will help to conserve the earth's natural resources, reduce landfill space and save energy and money [2]. Thus, this study will give an advantage to the various parties, particularly in the field of construction