Marginal regeneration is the process at the origin of the thinner patches produced at the bottom of vertical soap films and slowly rising to the top. It controls the film drainage, and thus its lifetime, and ultimately the life span of the whole foam sample. Despite its importance, the dynamical properties of this original hydrodynamical instability remains to be elucidated. Using a deformable frame, we identify a way to trigger the instability in a horizontal film; as the gravity-induced rising motion of the patches is suppressed in this case, we are able to study its long time dynamics for the first time, in a well-controlled situation. The predictions made by Mysels et al. [Soap Films: Study of Their Thinning and a Bibliography (Pergamon, New York, 1959)] are successfully tested on our data and are extended by an original coarsening model we develop. This model quantitatively reproduces the patch growth in the horizontal geometry and, when adapted to the vertical situation, is consistent with the known properties of the instability.

中文翻译：

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水平膜的边缘再生：非线性状态下的不稳定性增长定律

边缘再生是在垂直肥皂膜的底部产生较薄的补丁并逐渐上升到顶部的过程。它控制着薄膜的排水，从而控制了薄膜的使用寿命，并最终控制了整个泡沫样品的使用寿命。尽管它很重要，但这种原始流体动力学不稳定性的动力学特性仍有待阐明。使用可变形的镜框，我们确定了一种触发水平胶片不稳定的方法。由于在这种情况下抑制了由重力引起的斑块的上升运动，因此我们能够在良好控制的情况下首次研究其长时间动态。Mysels等人所做的预测。[肥皂膜：它们的稀化和书目研究（Pergamon，纽约，1959年）]已成功地根据我们的数据进行了测试，并通过我们开发的原始粗化模型进行了扩展。该模型定量地再现了水平几何形状中的斑块生长，并且当适应于垂直情况时，与不稳定性的已知特性是一致的。