ROTATION AND MAGNETIC EFFECT ON THE NON-AXISYMMETRICAL TEMPORAL INSTABILITY OF A CAPILLARY JET

The non-axisymmetric capillary instability of a cylindrical jet and it s break-up in another fluid are investigated in the case when the jet is subject to the combined effect of rotation, axial motion, and axial magnetic field. The criterion for maximum instability enables the det ermination of the intact jet length and size of the droplets produced in the course of the jet break-up process. Computational results for m odes m = 1, 2, 3 and 4 show that non-axisymmetry postpones the onset o f instability and for m = 3 and m = 4 the occurrence of instability is made possible only by substantially increasing both the angular veloc ity Omega(1), and by a limited permissible increase of \W-1 - W-2\, th e difference between axial velocities. These results also show that th e droplet radius and jet length are increasing due to the stabilizing effect of the axial magnetic field. Rotation will cause these two quan tities to diminish or enlarge according to the relative angular veloci ties of the jet and the surrounding medium.