The instability of streaming Walters' viscoelastic fluid B ' in porous medium

The instability of streaming Waiters' elastico-viscous fluid B' in porous m edium is considered. The case of two uniform streaming fluids separated by a horizontal boundary is considered. It is found that for the special case when perturbations in the direction of streaming are ignored, the system ca n be stable or unstable, depending upon kinematic viscoelasticity, medium p orosity and medium permeability, for both potential unstable and potentiall y stable configurations. In every other direction, a minimum value of wave- number has been found and the system is unstable for all wave-numbers great er than this minimum wave number.