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We investigated the flow profile of a polymer solution in a thinningcapillary bridge. Fluorescent tracer particles with a diameter of 3$\mu$m wereused to visualize the flow. The cylindrical shape of the filament introducedstrong optical abberations that could be corrected for, and we were able tocharacterize the flow in filaments with a thickness ranging from 150 to 30$\mu$m. In the first regime when the filament was still sufficiently large, weused a PIV algorithm to deduce the flow field. At later stages when the numberof particles in the observation plane decreased a PTV algorithm was used. Themain two results of our measurements are as follows. First, the flow profile atthe formation of the cylindrical filament is highly inhomogeneous and there isonly flow in the outer parts of the filament. Second, we find that in mostparts of the regime, where the temporal radius of the thinning filament can befitted with an exponential law the flow indeed is purely extensional.

Visualization of the flow profile inside a thinning filament during  capillary breakup of a polymer solution via particle image velocimetry (PIV)  and particle tracking velocimetry (PTV)