> disc, flowing oil

Actually you don't need that. Simply immerse the disc such that it is
covered by the liquid by 1-10 mm. The pulverisation relies on breaking
cavitation bubbles near the surface. About half the liquid 'around' the
bubbles will become aerosol. Of course if the power is not enough a simple
resonator can be used to raise the local field strength as required (as in
Morgan's tube). In this case the assembly needs to be tuned mechanically
for resonance.

Peter