论文标题

粘弹性丝的滴动力学

Drop Dynamics of Viscoelastic Filament

论文作者

Pingulkar, Hrishikesh, Peixinho, Jorge, Crumeyrolle, Olivier

论文摘要

接近分解的粘弹性聚合物溶液的拉伸可以在细丝上产生附着的滴,其特性和动态几乎不懂。可以使用直径空间时间图来量化毛细管桥的拉伸和连续的细丝,直到其分解为止,这些图显示了层次结构,以及卫星的不对称性在大中央下降周围掉落。所有滴落都会经历迁移,振荡和合并。另外,确定最小直径在细丝上的位置,以及滴的数量,其位置,滴的直径和细丝破裂时间。可以使用Deborah编号预测细丝上的最大滴数。这些图还量化了捏之前的细丝中的较大的hencky菌株。获得的最小直径用于测量延伸粘度,这表明聚合物浓度和细丝稀疏方向的影响。

The stretching of viscoelastic polymer solutions close to break-up 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.

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