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Capturing the flow field of bubbly flows using BTV in high viscosity liquid
Chemical Engineering Science ( IF 4.7 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.ces.2020.115943
Deyang Gao , Xue Li , Baolin Hou , Mao Ye , Aiqin Wang , Xiaodong Wang , Tao Zhang

Abstract Bubbles, as the micro-scale structure in bubble column reactors, are critical for determining the performance of gas-liquid transport phenomena. Quantificational characterization of the dynamic information of bubbles and of the flow field around bubbles is important for understanding gas-liquid heat/mass transfer. Bubble Tracking Velocimetry (BTV) had been well known by using naturally generated micro bubbles as tracing particles in low viscous system due to the simplicity and reliability. However, for applying BTV in high viscous system, the lesser amount of naturally generated micro bubbles and their heterogeneous distribution need to be addressed. This paper presents the development of a two-stage image-processing method of applying BTV for studying viscous nitrogen-glycerin systems and obtaining the dynamics information of macro bubbles and the detailed liquid flow field around bubbles. The criteria for bubbles collision are evaluated, and some typical cases involving interactions among bubbles are explored.

中文翻译:

在高粘度液体中使用 BTV 捕获气泡流的流场

摘要 气泡作为泡罩塔反应器中的微尺度结构,是决定气液传递现象性能的关键。气泡动态信息和气泡周围流场的定量表征对于理解气液传热/传质非常重要。气泡跟踪测速 (BTV) 因其简单性和可靠性而广为人知,它使用自然产生的微气泡作为低粘度系统中的跟踪粒子。然而,对于在高粘度系统中应用 BTV,需要解决较少量的自然产生的微气泡及其不均匀分布。本文介绍了一种应用 BTV 的两阶段图像处理方法的发展,用于研究粘性氮-甘油系统,并获得宏观气泡的动力学信息和气泡周围的详细液体流场。评估了气泡碰撞的标准,并探讨了一些涉及气泡之间相互作用的典型案例。
更新日期:2020-12-01
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