The stretching of viscoelastic polymer solutions close to breakup can create attached drops on a filament, whose properties and dynamics are little understood. The stretching of capillary bridges and the consecutive filament, until its breakup, can be quantified using diameter-space-time diagrams, which demonstrate hierarchy, as well as asymmetry of satellite drops around a big central drop. All drops experience migration, oscillation, and merging. In addition, the position of the minimum diameter on the filament is determined, along with the number of drops, their positions, the diameters of drops and the filament breakup time. The maximum number of drops on the filament can be predicted using the Deborah number. The diagrams also quantify the large Hencky strains in the filaments before pinch-off. The obtained minimum diameter is used to measure the extensional viscosity, which indicates the effect of polymer concentration and direction of filament thinning.

中文翻译：

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粘弹性长丝的下落动力学

粘弹性聚合物溶液的拉伸接近破裂可能会在长丝上产生附着的液滴，其特性和动力学尚不清楚。可以使用直径-时空图量化毛细管桥和连续细丝的拉伸，直到其破裂为止，该图显示了层次结构以及围绕大中心液滴的卫星液滴的不对称性。所有液滴均会发生迁移，振荡和合并。此外，确定最小直径在细丝上的位置，以及液滴的数量，其位置，液滴直径和细丝断裂时间。可以使用Deborah数预测灯丝上的最大液滴数。该图还量化了夹断前细丝中的大Hencky应变。