Grassia P
Department of Chemical and Process Engineering, University of Strathclyde, James Weir Building, 75 Montrose Street, Glasgow G1 1XJ, UK.
Proc Math Phys Eng Sci. 2022 Jun;478(2262):20220133. doi: 10.1098/rspa.2022.0133. Epub 2022 Jun 29.
A model developed by Bussonnière & Cantat [1] is considered for film-to-film surfactant transport around a meniscus within a foam, with the transport rate dependent upon film-to-film tension difference. The model is applied to the case of a five-film device, in which motors are used to compress two peripheral films on one side of a central film and to stretch another two peripheral films on the central film's other side. Moreover, it is considered that large amounts of compression or stretch are imposed on peripheral films, and also that compression or stretch might be imposed at high velocities (relative to a characteristic velocity associated with physico-chemical properties of the foam films themselves). The actual strain that results on elements within each film might differ from the imposed strain, with the instantaneous film length coupled to the actual strain determining the amount of surfactant currently on each film (and hence also the amount of surfactant that has transferred either from or onto films). Quite distinct surfactant transport behaviour is predicted for the stretched film compared with the compressed one. In particular, when a film is stretched sufficiently at high enough velocity, surfactant flux onto it is predicted to become extremely 'plastic', increasing significantly.
布索尼埃和康塔特[1]开发的一个模型被用于研究泡沫中弯月面周围薄膜间表面活性剂的传输，传输速率取决于薄膜间的张力差。该模型应用于一个五膜装置的情况，其中电机用于压缩中央薄膜一侧的两个外围薄膜，并拉伸中央薄膜另一侧的另外两个外围薄膜。此外，考虑到对外围薄膜施加了大量的压缩或拉伸，并且压缩或拉伸可能以高速进行（相对于与泡沫薄膜自身物理化学性质相关的特征速度）。每个薄膜内元件上产生的实际应变可能与施加的应变不同，瞬时薄膜长度与实际应变相关联，决定了每个薄膜上当前表面活性剂的量（从而也决定了从薄膜转移到薄膜上或从薄膜转移出的表面活性剂的量）。与压缩薄膜相比，拉伸薄膜预测会有截然不同的表面活性剂传输行为。特别是，当薄膜以足够高的速度充分拉伸时，预计表面活性剂向其上的通量会变得极其“可塑性”，显著增加。
