Figure 5.

(a) Actuating the piezo-electric disc using an AC voltage (f = 54 Hz, V = 12.5 V) results in dextran solution being pushed out and pulled into the fluid reservoir underneath the disc, which introduces perturbations on the interface of the thread. (b) Perturbations initially dampen and subsequently grow as shown in the series of micrographs taken at different distances from the inlet. ($r_0(4\mathrm{mm})=12\mu \mathrm{m},U=5.8\mathrm{mm}=\mathrm{s}$.)