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Instability of eccentric compound threads

  • Hanyu Ye
  • , Jie Peng
  • , Lijun Yang*
  • *此作品的通讯作者
  • Beihang University
  • Tsinghua University

科研成果: 期刊稿件文章同行评审

摘要

This paper investigates the temporal instability of an eccentric compound liquid thread. Results of linear stability are obtained for a typical case in the context of compound threads in microencapsulation. It is found that the disturbance growth rate of an eccentric compound liquid thread is close to that of the corresponding concentric one, in terms of both the maximum growth rate and the dominant wavenumber. Furthermore, linear stability results over a wide parameter range are obtained and the conclusion is basically unchanged. Energy balance of the destabilization process is analyzed to explain the mechanism of instability, and it is found that although the disturbance growth rate of an eccentric compound thread is close to that of the corresponding concentric thread, their energy balances are distinctively different. The disturbance interface shape and disturbance velocity distributions are plotted. It is found that the behavior of the disturbance velocity in the cross section plane is different from that of the axial disturbance velocity. The disturbance velocity distributions in the cross section plane explain the trend in the disturbance interface shape. A fully nonlinear simulation of the destabilization process is performed by the Gerris flow solver and the results agree well with those obtained by linear stability analysis.

源语言英语
文章编号082110
期刊Physics of Fluids
29
8
DOI
出版状态已出版 - 1 8月 2017

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