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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Empirical correlations and CFD simulations of vertical two-phase gas-liquid (Newtonian and non-Newtonian) slug flow compared against experimental data of void fraction
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Empirical correlations and CFD simulations of vertical two-phase gas-liquid (Newtonian and non-Newtonian) slug flow compared against experimental data of void fraction

机译：垂直两相气液（牛顿和非牛顿）段塞流与空隙率实验数据的经验相关性和CFD模拟

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摘要

Gas-Newtonian liquid two-phase flows (TPFs) are presented in several industrial processes (e.g. oil-gas industry). In spite of the common occurrence of these TPFs, the understanding of them is limited compared to single-phase flows. Various studies on TPF focus on developing empirical correlations based on large sets of experimental data for void fraction, which have proven accurate for specific conditions for which they were developed limiting their applicability. On the other hand, few studies focus on gas-non-Newtonian liquids TPFs, which are very common in chemical processes. The main reason is due to the characterization of the viscosity, which determines the hydraulic regime and flow behaviours of the system. The focus of this study is the analysis of the TPF (slug flow) for Newtonian and non-Newtonian liquids in a vertical pipe in terms of void fraction using computational fluid dynamics (CFD) and comparing this directly with experimental measurements and empirical relationships found in literature. A vertical tube of 3.4 m with an internal diameter of 0.1905 m was used. The two-phase CFD model was implemented in Star CCM+ using the volume of fluid (VOF) model. A relatively good agreement was found between the experimental measurements, the CFD results and the empirical relationships. In terms of void fraction for Newtonian and non-Newtonian liquids, the empirical correlations perform much worse than the CFD simulations, errors of 48 and 25%, respectively, against the experimental data. This shows that CFD can be used to predict void fraction relatively well for comparison against empirical correlations and they can be used for design and scale-up processes.
机译：气牛顿液体两相流（TPF）在几种工业过程（例如石油天然气工业）中都有介绍。尽管这些TPF常见，但与单相流相比，对它们的了解仍然有限。对TPF的各种研究都集中在基于大量空隙率实验数据的基础上发展经验相关性，事实证明，这些相关性在特定条件下是准确的，因此开发这些条件限制了它们的适用性。另一方面，很少有研究集中于非牛顿液体TPF，这在化学过程中非常普遍。主要原因是由于粘度的特性决定了系统的水力状态和流动特性。这项研究的重点是使用计算流体力学（CFD）分析垂直管中牛顿和非牛顿液体在空隙率方面的TPF（团流），并将其与实验测量结果和经验关系进行直接比较。文学。使用内径为0.1905 m的3.4 m垂直管。使用流体体积（VOF）模型在Star CCM +中实现了两阶段CFD模型。在实验测量，CFD结果和经验关系之间找到了相对较好的一致性。就牛顿液体和非牛顿液体的空隙率而言，经验相关性比CFD模拟差得多，相对于实验数据的误差分别为48％和25％。这表明，CFD可用于相对较好地预测空隙率，以便与经验相关性进行比较，并且它们可用于设计和放大过程。

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