  This paper reports the phenomenon of resonance weakening and streaming onset
in two phase acoustofluidics by performing numerical simulations of a capillary
droplet suspended in a microfluidic chamber. The simulations show that
depending on the relative acoustic properties of the two phases, it is possible
to observe (i)~the decrease in the total acoustic energy as the oscillation
amplitude at the wall increases, and (ii)~the onset of acoustic streaming. The
impact of these findings in terms of acoustic focusing inside droplets is also
discussed.
