論文

査読有り
2021年6月15日

Torsional fracture of viscoelastic liquid bridges

Proceedings of the National Academy of Sciences
  • San To Chan
  • ,
  • Frank P. A. van Berlo
  • ,
  • Hammad A. Faizi
  • ,
  • Atsushi Matsumoto
  • ,
  • Simon J. Haward
  • ,
  • Patrick D. Anderson
  • ,
  • Amy Q. Shen

118
24
開始ページ
e2104790118
終了ページ
e2104790118
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1073/pnas.2104790118
出版者・発行元
Proceedings of the National Academy of Sciences

Short liquid bridges are stable under the action of surface tension. In applications like electronic packaging, food engineering, and additive manufacturing, this poses challenges to the clean and fast dispensing of viscoelastic fluids. Here, we investigate how viscoelastic liquid bridges can be destabilized by torsion. By combining high-speed imaging and numerical simulation, we show that concave surfaces of liquid bridges can localize shear, in turn localizing normal stresses and making the surface more concave. Such positive feedback creates an indent, which propagates toward the center and leads to breakup of the liquid bridge. The indent formation mechanism closely resembles edge fracture, an often undesired viscoelastic flow instability characterized by the sudden indentation of the fluid’s free surface when the fluid is subjected to shear. By applying torsion, even short, capillary stable liquid bridges can be broken in the order of 1 s. This may lead to the development of dispensing protocols that reduce substrate contamination by the satellite droplets and long capillary tails formed by capillary retraction, which is the current mainstream industrial method for destabilizing viscoelastic liquid bridges.

リンク情報
DOI
https://doi.org/10.1073/pnas.2104790118
URL
http://www.pnas.org/syndication/doi/10.1073/pnas.2104790118
URL
https://syndication.highwire.org/content/doi/10.1073/pnas.2104790118
ID情報
  • DOI : 10.1073/pnas.2104790118
  • ISSN : 0027-8424
  • eISSN : 1091-6490

エクスポート
BibTeX RIS