论文标题
表面地形对低雷诺数液滴/气泡流的影响通过狭窄的通道
Effects of surface topography on low Reynolds number droplet/bubble flow through constricted passage
论文作者
论文摘要
本文试图研究表面地形对低雷诺数流动状态下液滴（或气泡）流动的影响。多相流从狭窄的段落中流动，在化学和生物学中发现了许多有趣的应用。确定流量和压降等流量的主要参数，并控制了平直通道流动中的复杂多相现象，例如降液合并，分解和扣子，是粘度比，液滴大小以及粘性力与表面张力力的比率（按毛细管数表示）。但是，除了上述参数外，流过狭窄段落的流程，其他各种几何参数，例如收缩比，狭窄的长度和形状，相位角度的长度和形状以及收缩之间的间距也开始起重要作用。大多数关于通过狭窄段落的滴流问题进行的研究旨在了解物理参数的作用，其中一些研究扩展了他们的分析以了解一个或两个几何参数的变化。但是找不到明确评估表面形貌作用的研究。已经尝试通过了解所涉及的物理学和机制来统一当前文献并分析几何参数的效果。然后使用缩放分析确定控制此问题的非二维数。
This paper is an attempt to study the effects of surface topography on the flow of a droplet (or a bubble) in a low Reynolds number flow regime. Multiphase flows through a constricted passage find many interesting applications in chemistry and biology. The main parameters which determine the flow properties such as flow rate and pressure drop, and govern the complex multiphase phenomena such as drop coalescence, break-up and snap-off in a straight channel flow are the viscosity ratio, droplet size and ratio of the viscous forces to the surface tension forces (denoted by Capillary number). But in flow through a constricted passage, in addition to the above-mentioned parameters, various other geometric parameters such as constriction ratio, length and shape of the constriction, phase angle, and spacing between the constrictions also start playing an important role. Most of the studies done on the problem of drop flow through a constricted passage have aimed to understand the role of physical parameters, with some studies extending their analysis to understand the variation of one or two geometric parameters. But no study could be found which explicitly evaluates the role of surface topography. An attempt has been made to unify the current literature as well as analyze the effect of the geometric parameters by understanding the physics and mechanisms involved. The non-dimensional numbers which govern this problem are then identified using the scaling analysis.
