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From successive deposition to clogging of poly(styrene) particles in the cross-flow through a T-shaped microchannel
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2023-06-03 , DOI: 10.1016/j.seppur.2023.124263
Dae Yeon Kim, Seon Yeop Jung, Young Jin Lee, Howon Jin, Kyung Hyun Ahn

Predicting and mitigating pore clogging are complex and challenging problems in fluid transport and filtration systems. This paper investigates the mechanism of particle deposition and pore clogging in a T-shaped microchannel under cross-flow conditions, using polystyrene particles dispersed in the glycerol solution. In this study, the flow rate and glycerol concentration are systematically controlled to analyze the effect of hydrodynamic stress on the clogging mechanism. Through flow visualization and image processing, the study identifies the step-by-step process of particle deposition and accumulation including the phenomena like “edge deposition”, “growth of deposition”, “rolling”, and “agglomerate breakup”. This study suggests that there is a critical stress that inhibits particle deposition and prevents pore clogging, and this stress is determined by the balance between the hydrodynamic force and the colloidal interaction force. The study also quantifies the clogging with the “blockage ratio” and “deposition ratio”, and shows that the stress correlates with the number of particles required for clogging. The methodology and findings of this study can aid in designing flow operating conditions to control particle deposition and clogging in various filtration systems and can serve as a critical first step toward understanding the behavior of particles in complex fluids with viscoelastic properties.



中文翻译:

从连续沉积到通过 T 形微通道的交叉流中聚(苯乙烯)颗粒的堵塞

预测和减轻孔隙堵塞是流体输送和过滤系统中复杂且具有挑战性的问题。本文使用分散在甘油溶液中的聚苯乙烯颗粒,研究了错流条件下 T 形微通道中颗粒沉积和孔隙堵塞的机理。在本研究中,系统地控制流速和甘油浓度,以分析流体动力应力对堵塞机制的影响。通过流动可视化和图像处理,该研究确定了颗粒沉积和积累的逐步过程,包括“边缘沉积”、“沉积增长”、“滚动”和“团块破碎”等现象。这项研究表明,存在抑制颗粒沉积并防止孔隙堵塞的临界应力,而这种应力是由流体动力和胶体相互作用力之间的平衡决定的。该研究还用“堵塞率”和“沉积率”量化堵塞,并表明应力与堵塞所需的颗粒数量相关。本研究的方法和结果有助于设计流动操作条件以控制各种过滤系统中的颗粒沉积和堵塞,并且可以作为理解具有粘弹性的复杂流体中颗粒行为的关键的第一步。

更新日期:2023-06-08
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