Department of Chemical, Materials, and Manufacturing Engineering , University of Napoli Federico II , P.le Tecchio 80 , 80125 Napoli , Italy.
Institute of Applied Science and Intelligent Systems , National Research Council of Italy , Via Campi Flegrei 34 , 80078 Pozzuoli , Naples , Italy.
Langmuir. 2018 May 15;34(19):5646-5654. doi: 10.1021/acs.langmuir.8b00520. Epub 2018 Apr 30.
When a Newtonian bubble ruptures, the film retraction dynamics is controlled by the interplay of surface, inertial, and viscous forces. In case a viscoelastic liquid is considered, the scenario is enriched by the appearance of a new significant contribution, namely, the elastic force. In this paper, we investigate experimentally the retraction of viscoelastic bubbles inflated at different blowing rates, showing that the amount of elastic energy stored by the liquid film enclosing the bubble depends on the inflation history and in turn affects the velocity of film retraction when the bubble is punctured. Several viscoelastic liquids are considered. We also perform direct numerical simulations to support the experimental findings. Finally, we develop a simple heuristic model able to interpret the physical mechanism underlying the process.
当牛顿气泡破裂时，薄膜回缩动力学受表面、惯性和粘性力的相互作用控制。如果考虑粘弹性液体，就会出现一个新的重要贡献，即弹性力。在本文中，我们通过实验研究了不同吹制速率下膨胀的粘弹性气泡的回缩，结果表明，包围气泡的液体薄膜所储存的弹性能量取决于充气历史，进而影响气泡穿孔时薄膜回缩的速度。我们还考虑了几种粘弹性液体。我们还进行了直接数值模拟以支持实验结果。最后，我们开发了一个简单的启发式模型，能够解释该过程的物理机制。
