Ramadan S. Tantawi

Rotation and modified Ohm's law influence on magneto-thermoelastic micropolar material with microtemperatures

The present article studies the effect of rotation on micropolar magneto-thermoelastic material with microtemperatures.The modified Ohms law was employed.The normal modes method used to get the solution of the physical quantities.The comparisons investigated numerically. The aim of the present article is studying the influence of the rotation on micropolar magneto-thermoelastic material with microtemperatures. The modified Ohms law insures the temperature gradient and the charge density effects on the governing equations of the studied system. The normal modes method is used to get the solution of the physical quantities of the problem. The comparisons investigated numerically and represented graphically in the presence and the absence of the rotation, the temperature gradient coefficient k0 and the micropolar effect.

Hall current and gravity effect on magnetomicropolar thermoelastic medium with microtemperatures

ABSTRACT This research is concerned with the effect of the gravity on micropolar thermoelastic medium possessing microtemperatures, using the modified Ohms law taking into consideration the Hall current. The expressions for the physical quantities are obtained using the normal-mode analysis method. The comparisons established numerically and represented graphically in the presence and absence of the gravity, the Hall current effect and the micropolar property.

Propagation of the photothermal waves in a semiconducting medium under L-S theory

ABSTRACT The model of the equations of generalized thermoelasticity based on the Lord–Shulman theory with one relaxation time is used to study the photothermal waves in a semiconducting medium. The exact expressions for the displacement components, temperature, carrier density, and stress components are obtained using normal mode analysis. Numerically simulated results are obtained and presented graphically for silicon to depict the effect of time parameter on the different physical quantities.

The Effect of Magnetic Field on an InfiniteConducting Thermoelastic Rotating Mediumunder G-N theory

The effect of magnetic field on the thermoelastic rotating medium is investigated under Green-Naghdi theory of types II, III. The medium is considered to be an infinite conducting homogeneous isotropic medium. The normal mode analysis is used to obtain the exact expressions for the considered variables. Numerical results for the considered variables are obtained and illustrated graphically. Comparisons are also made with the results predicted by Green-Naghdi theory of types II, III in the absence and presence of rotation and magnetic field.

Effect of the gravity on the photothermal waves in a semiconducting medium with an internal heat source and one relaxation time

Abstract The purpose of the present paper is to study the gravitational effect in a homogeneous isotropic semiconducting medium subjected to an internal heat source, based on Lord–Shulman theory. The problem is formulated in the dimensionless form and then solved analytically using the normal mode analysis method. The physical quantities are obtained and tested by a numerical study using the parameters of silicon as a target and presented graphically. The distribution of these quantities is represented graphically in the presence and absence of the internal heat source as well as gravity.