AI 中文总结
本研究针对泡沫刮擦过程中滑移-刮擦态动力学转变的控制机制不明问题，通过实验探究临界刮擦速度的影响因素，提出局部流固耦合模型，揭示间隙流与气泡变形的局部耦合是宏观转变的控制机制。
AI 中文摘要
泡沫刮擦过程存在动力学转变：滑移态下泡沫在平板下方运动，刮擦态下泡沫被从受限区域排出。尽管该转变已被证实与局部T1重排的传播相关，但控制其传播的物理参数仍不明确。本文研究了临界刮擦速度对液相分数、体黏度和表面活性剂体系的依赖关系。在所有测试条件下，临界毛细数均遵循$\mathrm{Ca}_c\proptoϕ^{-1}$，仅存在与溶液相关的前置因子差异。本文提出了一种局部流固耦合模型，该模型中通过普拉托边界网络传递的黏性功，与一次T1事件触发下一次事件所需的有效能量代价相互竞争。观测到的标度关系表明，有效能量代价由拉普拉斯压力主导，且与气泡变形的微小局部压缩分量一致。这些结果表明，间隙流与气泡变形之间的局部耦合是控制宏观滑移-刮擦转变的机制。
英文摘要
Foam scraping exhibits a dynamic transition between a slip state, in which the foam moves beneath a plate, and a scraping state, in which the foam is expelled from the confined region. Although this transition has been associated with the propagation of local T1 rearrangements, the physical parameter controlling their propagation remains unclear. Here, we investigate the dependence of the critical scraping velocity on the liquid fraction, bulk viscosity, and surfactant system. For all examined conditions, the critical capillary number follows $\mathrm{Ca}_c\proptoϕ^{-1}$, apart from a solution-dependent prefactor. We propose a local fluid--structure-coupling model in which viscous work transmitted through the Plateau-border network competes with the effective energetic cost required for one T1 event to trigger the next. The observed scaling implies an effective energetic cost governed by the Laplace pressure and is consistent with a small local compressive component of the bubble deformation. These results identify local coupling between interstitial flow and bubble deformation as a mechanism controlling the macroscopic slip--scraping transition.
Comments5 pages, 5 figures
