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Simulation of Polymer Reactors Using the Compartment Modeling Approach
Macromolecular Reaction Engineering ( IF 1.8 ) Pub Date : 2019-11-12 , DOI: 10.1002/mren.201900034 Esther Cremer‐Bujara 1 , Philip Biessey 1 , Marcus Grünewald 1
Macromolecular Reaction Engineering ( IF 1.8 ) Pub Date : 2019-11-12 , DOI: 10.1002/mren.201900034 Esther Cremer‐Bujara 1 , Philip Biessey 1 , Marcus Grünewald 1
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A compartment modeling approach based on computational fluid dynamics (CFD) simulations is applied to a simplified static mixer geometry. Compartments are derived from velocity fields obtained from cold CFD simulations. This methodology is based on the definition of periodic flow zones (PFZ) derived from the recurrent flow profile within the static mixer. In general, PFZ can be characterized by two different compartments: flow zones with hydrodynamic behavior of a tubular reactor and dead zones exhibiting a more continuous stirred tank reactor‐like characteristic. In CFD studies the influence of changing fluid properties, for example viscosity, on flow profile due to polymerization progress is considered. In the deterministic compartment model, the continuous flow profile within the static mixer is transformed to basic reactor models interconnected via an exchange stream. To reduce model complexity and the number of model parameters, constant volumes of compartments are assumed. Changes in hydrodynamics are considered by a variable exchange flow rate as a function of Re manipulating residence time in compartments. Simulation studies show the influence of decreasing exchange flow rates with polymerization progress, as Re decreases, resulting in a greater increase of viscosity in dead zones. The reactor performance is qualitatively represented by the simulation results.
中文翻译：
使用隔室建模方法模拟聚合物反应器
基于计算流体动力学（CFD）模拟的隔室建模方法已应用于简化的静态混合器几何形状。舱室是从冷CFD模拟获得的速度场中得出的。该方法基于对静态混合器内的循环流量分布的周期性流动区域（PFZ）的定义。通常，PFZ可以通过两个不同的隔室来表征：具有管式反应器流体动力学行为的流动区和表现出更连续搅拌釜式反应器特征的死区。在CFD研究中，考虑了由于聚合过程而导致的流体特性（例如粘度）变化对流动曲线的影响。在确定性隔室模型中，静态混合器中的连续流动曲线被转换为通过交换流相互连接的基本反应器模型。为了降低模型的复杂性和模型参数的数量，假定隔室的体积恒定。可变的交换流量将流体动力学的变化视为重新操纵隔间中的停留时间。模拟研究表明，随着Re的减少，交换流速的降低对聚合反应的影响，导致死区粘度的增加更大。仿真结果定性地表示了反应堆的性能。
更新日期：2019-11-12
中文翻译：
使用隔室建模方法模拟聚合物反应器
基于计算流体动力学（CFD）模拟的隔室建模方法已应用于简化的静态混合器几何形状。舱室是从冷CFD模拟获得的速度场中得出的。该方法基于对静态混合器内的循环流量分布的周期性流动区域（PFZ）的定义。通常，PFZ可以通过两个不同的隔室来表征：具有管式反应器流体动力学行为的流动区和表现出更连续搅拌釜式反应器特征的死区。在CFD研究中，考虑了由于聚合过程而导致的流体特性（例如粘度）变化对流动曲线的影响。在确定性隔室模型中，静态混合器中的连续流动曲线被转换为通过交换流相互连接的基本反应器模型。为了降低模型的复杂性和模型参数的数量，假定隔室的体积恒定。可变的交换流量将流体动力学的变化视为重新操纵隔间中的停留时间。模拟研究表明，随着Re的减少，交换流速的降低对聚合反应的影响，导致死区粘度的增加更大。仿真结果定性地表示了反应堆的性能。
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