论文标题
巨型肥皂膜的厚度曲线
Thickness profiles of giant soap films
论文作者
论文摘要
泡沫膜的生产,排水和稳定性,即与拟象活动接触的电影是令人着迷的问题,但仍未解决。在本文中,我们建议探索大速度和大型薄膜大小的政权。在文献中经典进行的实验中,这是无法访问的,并且使我们能够研究较大的扩展和较大扩展率的制度。借助我们的设置,我们通过从肥皂溶液中驱动的水平钓鱼线来制作高达两米高的肥皂膜,其速度为20〜cm/s至250〜cm/s。我们表征了电影中心部分的厚度,其表现像张力下的橡皮筋。我们表明,其厚度曲线由静态模型很好地描述,在该模型中,均匀的弹性膜通过自身的重量扩展。这导致了指数厚度的轮廓,其特征长度由重力和表面弹性之间的竞争给出。预制器是由薄膜的形状和面积固定的,受钓鱼线运动的控制,也由从外侧半月板中连续提取泡沫膜,比中央部分厚,并从其外侧边界逐渐侵入膜。我们提出的模型捕获了重力,膜弹性和膜提取之间的微妙相互作用,并导致预测与我们的实验数据一致。
Production, drainage and stability of foams films, i.e. films in contact with their menisci, are fascinating problems that remain still unsolved. In this article, we propose to explore the regime of large velocities and large film sizes. This one is not accessible in experiments classically conducted in the literature, and allows us to study the regime of large extension and large extension rates. With our setup, we make soap films up to two meters high by pulling a horizontal fishing line driven by belts out of a soapy solution at velocities ranging from 20~cm/s to 250~cm/s. We characterize the thickness profile of the central part of the film that behaves like a rubber band under tension. We show that its thickness profile is well described by a static model in which a homogeneous elastic film is stretched by its own weight. This leads to an exponential thickness profile with a characteristic length given by a competition between gravity and surface elasticity. The prefactor is fixed by the shape and area of the film, governed by the fishing line motion but also by a continuous extraction of foam film from the lateral menisci, thicker than the central part, and that progressively invades the film from its lateral boundaries. The model we propose captures the subtle interplay between gravity, film elasticity and film extraction and leads to predictions in good agreement with our experimental data.