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首页> 外文期刊>Journal of King Saud University >Mathematical modelling and numerical simulation of two-phase gas-liquid flows in stirred-tank reactors
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Mathematical modelling and numerical simulation of two-phase gas-liquid flows in stirred-tank reactors

机译：搅拌釜反应器内气液两相流动的数学模型和数值模拟

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This paper presents the mathematical modelling and numerical simulation of the turbulent, two-phase flow of liquid and gas in a gas-induced agitated stirred-tank reactor, using Computational Fluid Dynamics (CFD) techniques. The reactor used as an application demonstration of the developed model is the ozone-induced one, first designed and modeled by Yang et al. (1999). A three-dimensional (3D), transient, Euler-Euler two-phase flow model is developed and used to investigate the turbulent flow and mixing of liquid and bubbles in the stirred-tank reactor, applying the sliding mesh approach. Turbulence is simulated by means of several available models, the Renormalization Group (RNG) k-ε model being the one finally recommended as the most appropriate of the ones studied, for the present application. Two-way coupling between the two phases is modeled by means of appropriate inter-phase interaction relations. The study focused on bubbles of one size group (mean aerodynamic diameter of 2.5E-03m), but it is easily extended to any number of sizes. It is concluded that the predicted overall flow field pattern and the mixing of both phases around the two blades of the simulated baffled stirred vessel, as well as inside and outside of the main tube of the reactor, are physically plausible, appear reasonably accurate, and are, therefore, satisfying.
机译：本文利用计算流体动力学（CFD）技术，对气体诱导的搅拌釜反应器中液体和气体的湍流两相流进行数学建模和数值模拟。用作开发模型的应用演示的反应堆是由臭氧引起的反应堆，首先由Yang等人设计和建模。 （1999）。建立了三维（3D）瞬态Euler-Euler两相流模型，并使用滑动网格方法研究了搅拌釜反应器中的湍流以及液体和气泡的混合。湍流是通过几种可用的模型进行模拟的，对于本应用，最后归一化组（RNG）k-ε模型是最后被推荐为最合适的模型之一。两相之间的双向耦合是通过适当的相间相互作用关系建模的。该研究集中于一种尺寸的气泡（平均空气动力学直径为2.5E-03m），但它很容易扩展到任意数量的尺寸。结论是，预测的总流场模式和模拟折流板搅拌容器的两个叶片周围以及反应器主管内部和外部的两相混合在物理上是合理的，看起来相当准确，并且因此，令人满意。

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