Hydrodynamics of Similar Gases in Vortex Mixers: Effect of Physical Properties on the Onset of Instability,Industrial & Engineering Chemistry Research

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Hydrodynamics of Similar Gases in Vortex Mixers: Effect of Physical Properties on the Onset of Instability
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-01-07 , DOI: 10.1021/acs.iecr.1c04387
Gozde Gecim ₁ , Ertugrul Erkoc _{1,

2}

Affiliation

The effect of physical properties of gases on the flow hydrodynamics and on the onset of instability was studied to acquire information on how to design fast mixers specific for relevant operations where complete and improved gas mixing is important. To assess the effect of physical properties on the gas flow dynamics in vortex mixers, three gases hydrogen, nitrogen, and argon were chosen because of the viscosity and density differences they provide. Using flow visualization and PIV flow-field characterization techniques, critical Reynolds numbers of flow regime changes were identified from segregated to engulfment flow regimes for three pairs of gases. It was shown that the first critical point of the flow, where the gases have a full rotation in the chamber, depends on the inertial force in terms of dynamic pressure. While hydrogen having the highest kinematic viscosity had a full rotation at Re = 40, nitrogen and argon gases had their full rotation at Re = 70. After these points, a steady rotational flow as a consequence of the balance between the centrifugal and centripetal forces was observed. Similarly, the onset of the engulfment regime was observed earlier for hydrogen, at Re = 150, while it was at Re = 200 for nitrogen and Re = 220 for argon. The present study shows that the gas properties are effective parameters not only on the critical points but also on the shape of the swirling flow pattern formed in the mixer.

中文翻译：

涡旋混合器中类似气体的流体动力学：物理性质对不稳定开始的影响

研究了气体的物理性质对流动流体动力学和不稳定开始的影响，以获取有关如何设计快速混合器的信息，这些混合器专门用于相关操作，其中完全和改进的气体混合很重要。为了评估物理特性对涡流混合器中气体流动动力学的影响，选择了氢气、氮气和氩气三种气体，因为它们提供的粘度和密度不同。使用流动可视化和 PIV 流场表征技术，确定了三对气体从分离流态到吞没流态的临界雷诺数变化。结果表明，气体在腔室中完全旋转的流动的第一个临界点取决于动态压力方面的惯性力。Re = 40，氮气和氩气在Re = 70 时完全旋转。在这些点之后，由于离心力和向心力之间的平衡，观察到稳定的旋转流动。类似地，对于氢气，在Re = 150 时，较早观察到吞噬状态的开始，而对于氮气，在Re = 200 时，对于氩气，在Re = 220 时。目前的研究表明，气体特性不仅是关键点的有效参数，而且是混合器中形成的旋流模式形状的有效参数。

更新日期：2022-01-19

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