论文标题
三维降落液膜的数值研究
A Numerical Investigation of Three-dimensional Falling Liquid Films
论文作者
论文摘要
倾斜或垂直表面上的薄液膜的流动非常重要之一，由于质量和热传递的增加，由于膜表面上存在波带来的质量和热传递增加，因此应用涵盖了许多类型的工艺行业。尽管在这一领域进行了广泛的研究，但由于问题的复杂性，许多出色的问题仍然存在 - 这是由于纵横比极高和三维性质的结果。在这项研究中，使用混合前轨道/级别的混合方法对这些薄液膜上的自然形成和强制波的演化过程进行了数值研究，该方法具有明显，准确地捕获界面拓扑的优势，而不会受到质量保护，数值扩散或屈曲的界面profiles的问题。模拟是通过在膜出口处施加周期性边界条件在无限域规范上进行的。获得的结果表明，自然波从二维状态到三维无序结构的生长，逐步发展和最终过渡。最后，对人为强制波进行了三维模拟，而这些波的不同参数/特征与文献中现有的二维基准案例进行了比较，并发现了出色的一致性。 关键字：落下电影，薄膜，孤独的波浪，三维，强迫，界面跟踪
The flow of thin liquid films on inclined or vertical surfaces is one of immense importance, with applications spanning many types of process industries, due to the increased mass and heat transfer brought about by the presence of waves on film surfaces. While extensive research has been carried out in this area, many outstanding questions remain due to the complexity of the problem - a result of the extremely large aspect ratio and the three-dimensional nature. In this study, the evolution process of both naturally forming and forced waves on these thin liquid films is numerically studied using a hybrid front-tracking/level-set hybrid method which has the advantage of a distinct and accurate capture of the interface topology without being affected by the issues of mass conservation, numerical diffusion or spurious interface profiles. The simulation is conducted on an infinite domain specification through the imposition of periodic boundary conditions at the film outlet. The obtained results show the growth, step-wise progression, and eventual transition of natural waves from the two-dimensional state to three-dimensional disordered structures. Finally, three-dimensional simulations of artificially forced waves are carried out while different parameters/features of these waves are compared with the existing two-dimensional benchmark cases in the literature with excellent agreement found. Keywords: falling films, thin films, solitary waves, three-dimension, forcing, interface tracking
