Power Consumption Characterization of Energy-Efficient Aerated Coaxial Mixers Containing Yield-Stress Biopolymer Solutions,Industrial & Engineering Chemistry Research

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Power Consumption Characterization of Energy-Efficient Aerated Coaxial Mixers Containing Yield-Stress Biopolymer Solutions
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-08-19 , DOI: 10.1021/acs.iecr.2c02008
Paloma L. Barros ₁ , Farhad Ein-Mozaffari ₁ , Ali Lohi ₁

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The operations of mixing systems utilized in a variety of industrial applications for dispersing gas in non-Newtonian fluids are complex. The main challenge is to maintain a homogeneous medium throughout the vessel. In fact, coaxial mixers have demonstrated an energy-efficient performance for systems containing rheologically complex fluids. However, the accurate characterization of the power demand for gas dispersion in yield-stress fluids using coaxial mixers remains unclear. Hence, the objective of the present work was to investigate the power characteristics of a coaxial mixing system comprising the xanthan gum solution, which is a shear-thinning fluid possessing yield stress. The power consumption of an Anchor-PBT mixing configuration was measured experimentally at different central and anchor impeller speeds, rotation modes, and aeration rates. The main effects of the operating variables and their interactions were quantified using a central composite design of experiments. Significant effects of the central impeller speed and the interaction between the anchor speed and the aeration rate were identified. Also, a generalized power curve for this mixing system was proposed based on a predefined equivalent impeller speed and impeller diameter expressions to develop the novel power number and Reynolds number. The findings of this work provide an asset in designing and scaling up of energy-efficient aerated coaxial mixers by rapidly estimating the power demand.

中文翻译：

包含屈服应力生物聚合物溶液的节能充气同轴混合器的功耗特性

用于在非牛顿流体中分散气体的各种工业应用中使用的混合系统的操作是复杂的。主要挑战是在整个容器中保持均匀的介质。事实上，同轴混合器已经展示了用于包含流变复杂流体的系统的节能性能。然而，使用同轴混合器准确描述屈服应力流体中气体分散的功率需求仍不清楚。因此，本工作的目的是研究包含黄原胶溶液的同轴混合系统的功率特性，黄原胶溶液是一种具有屈服应力的剪切稀化流体。Anchor-PBT 混合配置的功耗在不同的中心和锚叶轮速度、旋转模式、和曝气率。使用中心复合实验设计对操作变量及其相互作用的主要影响进行量化。确定了中心叶轮速度以及锚速与曝气率之间的相互作用的显着影响。此外，基于预定义的等效叶轮速度和叶轮直径表达式，提出了该混合系统的广义功率曲线，以开发新的功率数和雷诺数。这项工作的结果通过快速估计功率需求为设计和扩大节能充气同轴混合器提供了一种资产。确定了中心叶轮速度以及锚速与曝气率之间的相互作用的显着影响。此外，基于预定义的等效叶轮速度和叶轮直径表达式，提出了该混合系统的广义功率曲线，以开发新的功率数和雷诺数。这项工作的结果通过快速估计功率需求为设计和扩大节能充气同轴混合器提供了一种资产。确定了中心叶轮速度以及锚速与曝气率之间的相互作用的显着影响。此外，基于预定义的等效叶轮速度和叶轮直径表达式，提出了该混合系统的广义功率曲线，以开发新的功率数和雷诺数。这项工作的结果通过快速估计功率需求为设计和扩大节能充气同轴混合器提供了一种资产。

更新日期：2022-08-19

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