The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The free convection boundary layer of water at 4° C from a vertical flat plate with step discontinuities in surface temperature is investigated here. Under a convenient transformation of variabIes, the problem is cast into a pair of partial differential equations, which are numerically solved using the well-known Keller-box method. Temperature and veloeity field developments are presented for various...
An analysis of a steady laminar mixed convection boundary layer flow along a vertical cone of constant wall heat flux for any Prandtl number is presented. A mixed convection parameter [...], as proposed by Lin and Chen (1988), is used to serve as a controlling parameter that determines the relative importance of the forced and the free convection flows. New coordinates and dependent variabIes are...
The present study is concerned with the reflection and transmission of thermoelastic pIane waves at an imperfect interface between two generalized thermoelastic solid half-spaces of different elastic and thermal properties. The generalized thermoelastic theory with one relaxation time developed by Lord and Shulman (1967) has been used to study the problem. The expressions for the reflection and transmission...
Similarity solutions for one-dimensional unsteady self-similar flow behind a strong shock driven out by a cylindricaI (or spherical) piston in a medium which is assumed to be a non-ideaI gas obeying a simplified van der Waals equation of state are obtained. Both the cases, when the flow between the shock and the piston is isothermal or adiabatic, are considered. It is observed that the assumption...
A dynamical two-dimensional problem of thermoelasticity has been considered to investigate the disturbance due to mechanical (horizontal or vertical) force and thermal source in a homogeneous, thermally conducting orthorhombic material. The Fourier transforms are applied to basic equations to fonn a vector matrix differential equation, which is then solved by eigenvalue approach. The displacements,...
This paper studies the disturbance due to time harmonic normal and thermal point loads acting on the boundary of a homogeneous isotropic thermoviscoelastic solid halfspace. The Kelvin-Voigt model is used to investigate the instant problem in the context of generalized theories of thermoelasticity. The Hankel transform technique has been employed to solve the boundary value problem in the transformed...
A steady laminar flow of an incompressible Newtonian fluid with variable viscosity and thermal conductivity is considered, in a narrow space between two surfaces of revolution, rotating with generally different angular velocities about a common axis of symmetry. The problem statement for two classes of throughflow, with full and rotational inertia, is fonnulated. A procedure for perturbing a creeping...
The effect of a chemical reaction on the free convection flow of a viscous incompressible conductive micropolar fluid from a radiative vertical porous plate with a uniform surface temperature, uniform rate of suction or injection and uniform magnetic field is investigated. The Rosseland diffusion approximation is used to describe the radiative heat flux in the energy equation. As the micropolar parameter...
The disturbance due to a time harmonic mechanical or thermal source in a homogeneous, anisotropic, generalized thermoviscoelastic half-space is investigated by applying the Fourier transform. The integral transform has been inverted by using a numerical technique to the components of displacements, stresses, and temperature distribution in the physical domain for the Lord-Shulman (L-S) theory, Green-Lindsay...
Liquid-solid interface is considered for studying the reflection-refraction phenomenon where a liquid medium is assumed thermally conducting and a solid medium is assumed thermally conducting with circular cracks. The boundary conditions are satisfied to obtain reflection and refraction coefficients. A numerical example is considered to show the effects of circular cracks on the reflection-refraction...
In this paper, the influences of electron radiation on the appearance of microwave-dried fibers were studied. Previously dried fibers with different properties are radiated by the electron beam of an electron microscope. Variable magnifications, processing time and voltage are applied. Using electron microscopy photographs, fibers inflations or deflations are measured precisely. It is observed that...
The purpose of the present investigation is to study an unsteady magnetohydrodynamic flow of a viscous incompressible electrically conducting fluid occupying a semi-infinite region of space bounded by an infinite vertical moving plate. The flow is considered to be gray in the presence of free convection, mass transfer and radiation. An exact solution of the goveming equations is obtained by applying...
In this paper, we study generalized chaos synchronization of two Lorenz dynamical systems via linear transformation. This synchronization method is based on the stability criterion of linear systems. This method does not require calculation of the Lyapunov exponents. We obtain the functional relationship between the states of the driving system and response system. Finally, we show the simulation...
The article presents a method of mathematical modelling and simulation as a method of solution to some problems of electrostatic technologies (with emphasis on flocking technology).
Drying is a complex operation involving transient transfer of heat and mass along with several rate processes, such as physical or chemical transformations, which in turn, may cause changes in product quality. This article surveys the impacts of convective, infrared and microwave drying on the strength of dried wood. The effects of drying methods on mechanical properties have been studied for many...
The analytic expressions for the displacements, microrotation, stresses and temperature distribution on the free surface of a micropolar thermoelastic medium possessing cubic symmetry as a result of time harmonic inclined load have been obtained. The inclined load is assumed to be a linear combination of a normal load and a tangential load. The Fourierer transform has been employed to solve the problem...
The propagation of waves in a homogeneous isotropic micropolar thermoelastic plate subjected to stress free and rigidly fixed boundary conditions is investigated. The theory of micropolar thermoelasticity without energy dissipation has been taken to study the problem The secular equations for homogeneous isotropic micropolar thermoelastic plate without energy dissipation in closed form for symmetric...
The present analysis is made to investigate the effects of Hall current on the free convection flow of an incompressible, viscous fluid through a porous medium in a rotating system past an infinite vertical porous plate in the presence of a heat sink and a transversely applied uniform magnetic field. Solutions of velocity and temperature fields are obtained using the perturbation technique. Expressions...
The stability of the piane interface separating two Rivlin-Ericksen elastico-viscous superposed fluids has been studied. The density, viscosity and viscoelasticity are assumed to be exponentially varying. For stable stratifications, the system is found to be stable or unstable under certain conditions. The system is found to be unstable for unstable stratifications. Also the growth rates are found...
The effects of thermal radiation on the flow of a viscous incompressible fluid occupying a semi-infinite region of space bounded by an infinite horizontal moving hot plate in the presence of indirect natural convection by way of an induced pressure gradient, is considered. The fluid is a gray, absorbing-emitting radiation but a nonseattering medium. An exact solution is obtained for the flow by applying...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.