Application of Annular Self-oscillating Jet Pump in Gas-liquid Mixture Mass Transfer
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摘要: 较传统环形射流泵而言，环形自激振荡射流泵，可以在无外界激励的作用下仅靠自身合理的尺寸设计在自激振荡腔室内形成循环的振荡效果，利用自激振荡腔室产生的强烈自激振荡涡旋来提高气液两相传质的效果。本文采用计算与实验相结合的方法，使用k-ε湍流模型对环形自激振荡射流泵进行CFD（Computational fluid dynamics）流场仿真，并针对脱氧后的水溶解氧的能力进行了研究。结果表明，环形自激振荡射流泵掺混能力较传统环形射流泵提升15%~20%，与传统曝气头相比，混合能力提升30%以上。混合过程中由于自激振荡产生的脉冲效果使气相和液相之间产生了剧烈的剪切场，在剪切力的作用下使混合液中的气泡数量增多，气泡粒径变小，从而增加了气相与液相接触的面积，进而达到提高气液两相掺混传质的目的。Abstract: Compared with the conventional annular jet pump, the annular self-excited oscillating jet pump can form a circular oscillation effect in the self-excited oscillating chamber only by its own reasonable size design without external excitation. The self-excited oscillation chamber generates a strong self-oscillating vortex to enhance the effect of gas-liquid two-phase mass transfer. In this paper, a three-dimensional computational fluid dynamics of a ring-shaped self-oscillating jet pump is performed using the k-ε turbulence model and combining computational and experimental methods. The ability of dissolved oxygen in water after deoxygenation is studied. The results show that the mixing capacity of the annular self-oscillating jet pump is 15%~20% higher than that of the traditional annular jet pump. Compared with the traditional aerator, the mixing capacity is increased by more than 30%. In the mixing process, the pulse effect due to self-oscillation causes a sharp shear field between the gas phase and the liquid phase. Under the action of the shear force, the number of bubbles in the mixed liquid increases, and the bubble particle size becomes smaller, thereby increasing the area in which the gas and liquid phases are in contact with each other increases the mass transfer of the gas-liquid two-phase mixture.
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Key words:
- self-oscillating /
- jet pump /
- turbulence model /
- computational fluid dynamics /
- two-phase mass transfer
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