THERMAL-INSTABILITY IN RIVLIN-ERICKSEN ELASTOVISCOUS FLUIDS IN HYDROMAGNETICS

The thermal instability of a layer of Rivlin-Ericksen elastico-viscous fluid acted on by a uniform vertical magnetic field is considered. Fo r stationary convection, a Rivlin-Ericksen elastico-viscous fluid beha ves like a Newtonian fluid. The magnetic field has a stabilizing effec t. It is found that the presence of a magnetic field introduces oscill atory modes which were non-existent in its absence. The sufficient con dition for the non-existence of overstability is also obtained.