Study of the Hydrodynamic Characteristics of Non-Newtonian Polymer Solution Fluid in Concentric Annulus Using Computational Fluid Dynamics Methods,Macromolecular Reaction Engineering

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Study of the Hydrodynamic Characteristics of Non-Newtonian Polymer Solution Fluid in Concentric Annulus Using Computational Fluid Dynamics Methods
Macromolecular Reaction Engineering ( IF 1.8 ) Pub Date : 2021-10-04 , DOI: 10.1002/mren.202100037
Yu He ₁ , Guangwen He ₂ , Bin Yu ₂ , Shaowei Yan ₂ , Le Xie ₁

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Non-Newtonian fluids flowing in a concentric annulus have been widely observed in industrial chemical processes. In this study, the hydrodynamic characteristics of a non-Newtonian fluid (polymer solution) in concentric annulus are investigated using computational fluid dynamics (CFD) modeling and numerical simulation methods. First, a simple grid independence analysis is carried out to select appropriate grid parameters. Then the rationality of the proposed CFD model is confirmed by the near-wall velocity profiles. Based on the validated model, the effects of the fluid properties and radius ratio on the flow structure characteristics are studied at various inlet velocities. According to the simulated flow fields (i.e., velocity, pressure, strain rate, and wall shear stress), the flow pattern, flow resistance, and residence time distribution characteristics are analyzed in the laminar and turbulent regimes. The presented results show that non-Newtonian fluids have unique flow behaviors in concentric annulus when compared with Newtonian fluids.

中文翻译：

使用计算流体动力学方法研究同心环中非牛顿聚合物溶液流体的流体动力学特性

在工业化学过程中已广泛观察到在同心环中流动的非牛顿流体。在这项研究中，使用计算流体动力学 (CFD) 建模和数值模拟方法研究了同心环中非牛顿流体（聚合物溶液）的流体动力学特性。首先，进行简单的网格独立性分析以选择合适的网格参数。然后，近壁速度剖面证实了所提出的 CFD 模型的合理性。在验证模型的基础上，研究了不同入口速度下流体性质和半径比对流动结构特征的影响。根据模拟的流场（即速度、压力、应变率和壁面剪应力），流型、流阻、分析了层流和湍流状态下的停留时间分布特征。所呈现的结果表明，与牛顿流体相比，非牛顿流体在同心环空中具有独特的流动行为。

更新日期：2021-10-04

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