Hall effects on unsteady hydromagnetic flow past an eccentrically rotating porous disk in a rotating fluid

Hall effects on unsteady hydromagnetic flow past a rotating disk are investigated when the fluid at infinity rotates about non-coincident axes. The rotation of the fluid at infinity changes impulsively. It is found that at large time the steady state is reached through inertial oscillations. The frequency of these oscillations first increases, reaches a maximum and then decreases with increase in Hall parameter.