Abstract: The effect of viscosity ratio (λ, defined as viscosity of surrounding medium/viscosity of fluid jet) on stability of axisymmetric (m=0) and asymmetric (m=1) modes of perturbation on a liquid-liquid jet in presence of radial electric field (E0 ), is studied using linear stability analysis. The viscosity ratio is shown to have a damping effect on both the modes of perturbation. However
the effect was found more pronounced for the m=1 mode as compared to m=1 mode. Investigating the effect of both E0 and λ
simultaneously, an operating diagram is generated, which clearly shows the regions of dominance of the two modes for a range of
electric field and viscosity ratio values.