发表机构
The University of Osaka; Nagoya University（大阪大学; 名古屋大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过耗散粒子动力学模拟，提出以有效拉伸速率统一描述剪切与拉伸流动下蠕虫状胶束的流动诱导断裂，发现胶束取向是关键因素。
AI 中文摘要
我们利用耗散粒子动力学模拟，研究了表面活性剂溶液在剪切、单轴拉伸、平面拉伸和双轴拉伸流动中，不同流动运动学下蠕虫状胶束的流动诱导断裂。蠕虫状胶束的平均寿命被用来量化断裂程度。虽然当变形速率足够高时，所有流动类型中都会发生流动诱导断裂，但平均寿命对变形速率的依赖关系在不同流动类型间有所不同。为了提供统一描述，我们引入了一个由速度梯度张量和胶束取向决定的有效拉伸速率。当用该有效拉伸速率表示时，所有考虑的流动类型下获得的平均寿命都汇聚到一条曲线上。这些结果表明，流动诱导断裂的统一描述不仅需要施加流动的强度和运动学，还需要胶束相对于拉伸方向的取向。
英文摘要
We investigate flow-induced scission of wormlike micelles under different flow kinematics using dissipative particle dynamics simulations of surfactant solutions in shear, uniaxial extensional, planar extensional, and biaxial extensional flows. The average lifetime of wormlike micelles is used to quantify the degree of scission. While flow-induced scission occurs in all flow types when the deformation rate is sufficiently high, the dependence of the average lifetime on the deformation rate differs among flow types. To provide a unified description, we introduce an effective extension rate determined by the velocity gradient tensor and micellar orientation. When expressed in terms of this effective extension rate, the average lifetimes obtained under all flow types considered collapse onto a single curve. These results demonstrate that a unified description of flow-induced scission requires not only the strength and kinematics of the imposed flow, but also the micellar orientation relative to the extensional direction.
