Can superfluid vortex lines excite normal fluid turbulence in He-4?

When helium II is made turbulent the superfluid component for ms a dense ta ngle of quantized vortex lines which can be easily detected experimentally using the second sound technique. On the contrary little is known about the normal fluid component: on the experimental side progress has been hindere d by the lack of simple pout visualization, and on the theoretical side att ention has been concentrated on the effect that a given normal flow has on the superfluid vortices, not vice-versa. Attempting to fill this gap: we di scuss results of recent calculations in which we find that normal fluid vor ticity structures can be generated by superfluid vortices. In particular we address the issue of whether the superfluid vortices can make the normal f luid turbulent.