MHD Peristaltic Flow of a Couple Stress Fluids with Heat and Mass Transfer through a Porous Medium

In the present article, we have studied the effects of heat and mass transfer on the MHD flow of an incompressible, electrically conducting couple stress fluid through a porous medium in an asymmetric flexible channel over which a traveling wave of contraction and expansion is produced, resulting in a peristaltic motion. The flow is examined in a wave frame of reference moving with the velocity of the wave. Formulas of dimensionless velocity, temperature and concentration are obtained analytically under assumptions of long wavelength and low Reynolds number. The effects of various parameters of interest such as the couple stress fluid parameter, Darcy number, Hartmann number and Schmidt number on these formulas were discussed and illustrated graphically through a set of figures. Key words: peristalsis,  Couple stress fluid,  Porous medium,  MHD flow, Heat transfer,  Mass transfer

Magnetogravitodynamic Stability of Resistive Streaming Triple Superposed of Fluid Layers

Stability of Magnetohydrodynamic streaming resistive triple superposed fluid layers has been studied. The basic equations were obtained by combining ordinary hydrodynamic equations and Maxwells equations related to electromagnetic field theory. The appropriate boundary conditions have been established for this model, then we obtained the dispersion relationship. The behavior of the system in terms of whether stable or unstable has been discussed. The curves are drawn to illustrate the areas of stability and instability. The effect of different parameters on the stability and the instability of this system was studied. It is found in the magnetic field permeability coefficient and the intensity of the magnetic field values has a destabilizing influence. Also, the increase of the fluids density values has a stabilizing influence. The streaming velocity has a destabilizing influence

MHD Stability of a Streaming Resistive Hollow Jet Analytic and Numeric Analysis

The axisymmetric magneto hydrodynamic (MHD) stability of streaming resistive hollow jet under oblique varying magnetic fields has been discussed. The stability criterion is established in its general form, studied analytically and the results are confirmed numerically. The destabilizing effect of the capillary force is found in small domain in the axisymmetric perturbation

Magnetohydrodynamic Stability of Streaming Jet Pervaded Internally by Varying Transverse Magnetic Field

The Magnetohydrodynamic stability of a streaming cylindrical model penetrated by varying transverse magnetic field has been discussed. The problem is formulated, the basic equations are solved, upon appropriate boundary conditions the eigenvalue relation is derived and discussed analytically, and the results are verified numerically. The capillary force is destabilizing in a small axisymmetric domain 0<<1 and stabilizing otherwise. The streaming has a strong destabilizing effect in all kinds of perturbation. The toroidal varying magnetic field interior the fluid has no direct effect at all on the stability of the fluid column. The axial exterior field has strong stabilizing effect on the model. The effect of all acting forces altogether could be identified via the numerical analysis of the stability theory of the present model