School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia.
School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia; School of Science, Loughborough University, Loughborough LE11 3TU, UK.
J Colloid Interface Sci. 2017 Dec 15;508:567-574. doi: 10.1016/j.jcis.2017.08.072. Epub 2017 Aug 24.
Immiscible fluid systems are ubiquitous in industry, medicine and nature. Understanding the phase morphologies and intraphase fluid motion is often desirable in many of these situations; for example, this will aid improved design of microfluidic platforms for the production of medicinal formulations. In this paper, we detail a Smoothed Particle Hydrodynamics (SPH) approach that facilitates this understanding. The approach includes surface tension and enforces incompressibility. The approach also allows the consideration of an arbitrary number of immiscible phases of differing viscosities and densities. The nature of the phase morphologies can be arbitrary and change in time, including break-up (which is illustrated) and coalescence. The use of different fluid constitutive models, including non-Newtonian models, is also possible. The validity of the model is demonstrated by applying it to a range of model problems with known solutions, including the Young-Laplace problem, confined droplet deformation under a linear shear field, and a droplet falling under gravity through another quiescent liquid. Results are also presented to illustrate how the SPH model can be used to elucidate the behaviour of immiscible liquid systems.
不混溶液体系统在工业、医学和自然界中无处不在。在许多情况下，了解相形态和相间流体运动是很有必要的；例如，这将有助于改进用于生产药物制剂的微流控平台的设计。在本文中，我们详细介绍了一种有助于实现这一目标的光滑粒子流体动力学 (SPH) 方法。该方法包括表面张力并强制不可压缩性。该方法还允许考虑具有不同粘度和密度的任意数量的不混溶相。相形态的性质可以是任意的并且随时间变化，包括破裂（如图所示）和聚结。也可以使用不同的流体本构模型，包括非牛顿模型。通过将模型应用于一系列具有已知解的模型问题来验证模型的有效性，包括杨氏拉普拉斯问题、线性剪切场下受限液滴变形和重力作用下通过另一种静止液体下落的液滴。还给出了结果，说明了 SPH 模型如何用于阐明不混溶液体系统的行为。
