A note on unsteady hydromagnetic flow in a rotating channel permeated by an inclined magnetic field in the presence of an oscillator

Abstract

Ghosh [Czech. J. Phys.46 (1996) 85] has extended the problem of an unsteady hydromagnetic flow (MHD) in a rotating environment permeated by an inclination of a uniform magnetic field with the positive direction of the axis of rotation; a fluid-pulse oscillator is applied along the axis of rotation in order to explain the validity of a physical situation of a steady flow under the conditions and configurations as stated by Ghosh in the paper cited above. It is investigated that the unsteady MHD flow has an intrinsic stability subject to Ghosh inertial frequency in relation withG ²_MK =(16K ⁴ −M ⁴ sin⁴ θ)^1/2, where MHD flow stability parameter of the Earth’s liquid core is taken into account, which seems to have disappeared in the literature since 1942. It is important to say that the thermonuclear reaction indicates a maximum dissipation of energy into smallest eddies when the kinetic energy is transformed into heat.