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Abstract <p>In this work, the deformation dynamics of viscoelastic droplets of polyacrylonitrile (PAN) solutions in dimethyl sulfoxide flowing in silicone oil through a channel with an abrupt contraction is investigated experimentally and by numerical simulation. The main attention is focused on the influence of PAN concentration and capillary number on the deformation behavior and stability of such droplets. It is shown that increasing PAN concentration leads to a substantial increase in droplet elongation. The mode of droplet instability development also depends on the polymer concentration: at low PAN contents, the primary droplet is disintegrated into secondary droplets of comparable sizes, whereas, at higher polymer concentrations, the formation of a “swallow-tail” structure is followed by its disintegration into small satellite droplets. The observed trends are systemized as droplet stability diagrams plotted in the capillary number–PAN concentration coordinates. The obtained results are of interest for the development of technologies for producing microfibers based on viscoelastic polymer solutions using flow focusing in microfluidic chips.</p>

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Deformation and Stability of Viscoelastic Polymer Droplet Flowing through a Channel with an Abrupt Contraction

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • S. A. Patlazhan,
  • D. E. Roshchin,
  • I. V. Kravchenko,
  • A. F. Vashchenko,
  • I. Yu. Skvortsov

摘要

Abstract

In this work, the deformation dynamics of viscoelastic droplets of polyacrylonitrile (PAN) solutions in dimethyl sulfoxide flowing in silicone oil through a channel with an abrupt contraction is investigated experimentally and by numerical simulation. The main attention is focused on the influence of PAN concentration and capillary number on the deformation behavior and stability of such droplets. It is shown that increasing PAN concentration leads to a substantial increase in droplet elongation. The mode of droplet instability development also depends on the polymer concentration: at low PAN contents, the primary droplet is disintegrated into secondary droplets of comparable sizes, whereas, at higher polymer concentrations, the formation of a “swallow-tail” structure is followed by its disintegration into small satellite droplets. The observed trends are systemized as droplet stability diagrams plotted in the capillary number–PAN concentration coordinates. The obtained results are of interest for the development of technologies for producing microfibers based on viscoelastic polymer solutions using flow focusing in microfluidic chips.