NONAXISYMMETRIC FORCE-FREE MAGNETIC-FIELD INSTABILITY OF STREAMING LIQUID JET

The nonaxisymmetric magnetodynamic instability of a streaming liquid j et endowed with surface tension and ambient with force-free magnetic f ield has been developed. The boundary value problem is formulated, sim plified and solved. Upon applying the pressure balance across the pert urbed interface, a general dispersion relation is derived and discusse d. Some stability criteria are obtained as limiting cases. The capilla ry force is destabilizing only in a small domain of axisymmetric distu rbance while it is stabilizing otherwise. The streaming has a strong d estabilizing effect in all modes of perturbation and that influence is independent of the perturbed wavelength. The uniform magnetic held in terior the liquid jet is stabilizing in all modes of perturbation. Eac h of the longitudinal and azimuthal Lundquist force-free fields separa tely is stabilizing but their combined effect is extensively destabili zing. The principle of the exchange of stability is allowed for the pr esent model due to the non-uniform molity behaviour of the force-free fields. In spite of all that the electro-magnetic force stresses are a ble to endow the fluid with a sort of rigidity that improves the stabi lity states.