Experimental observations of bubbling regimes at in-line multi-orifice bubblers
Experimental observations of bubbling regimes at in-line multi-orifice bubblers
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DOI：
10.1016/j.ijmultiphaseflow.2019.02.008
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发表时间：
2019-05-01
影响因子：
3.8
通讯作者：
Llewellin, Edward W.
中科院分区：
文献类型：
--
作者：
Capponi, Antonio;Llewellin, Edward W.
气泡的形成和起泡制度的特点是单孔起泡器和工业穿孔板的情况下。然而，从起泡器与多个在线孔的起泡制度仍然很差的描述。在这里，我们调查的动力学的气泡形成在单孔和多孔起泡器，一个，三个，五个和九个在线孔在一个80厘米长的起泡器。我们使用高速摄像和图像处理，以确定起泡器体积的影响，和数量，间距和孔径，起泡制度，气泡周期，和气泡形成时间。我们确定了五个主要的鼓泡区的基础上同步孔，并讨论了影响鼓泡动力学的参数。减小鼓泡器体积可减小气泡体积和气泡周期，并增强同步性。增加孔口直径导致气泡体积增加并增强同步性。喷孔间距对鼓泡状态的影响不大。基于实验观察，我们开发了新的气泡制度的地图构建使用无量纲电容数和韦伯数。(C)2019年，任作家。爱思唯尔有限公司出版
Bubble formation and bubbling regimes are well-characterized for the cases of single-orifice bubblers and industrial perforated plates. However, bubbling regimes from bubblers with multiple in-line orifices remain poorly described. Here, we investigate the dynamics of bubble formation at both single-orifice and multi-orifice bubblers, with one, three, five and nine in-line orifices in an 80-cm-long bubbler. We use high-speed videography and image processing to identify the effects of bubbler volume, and the number, spacing, and diameter of orifices, on bubbling regimes, bubble period, and bubble formation time. We identify five main bubbling regimes based on synchronization among orifices, and discuss the parameters affecting the bubbling dynamics. Decreasing bubbler volume leads to a decrease in bubble volume and bubble period, and enhances synchronization. Increasing orifice diameter leads to an increase in bubble volume and enhances synchronization. Spacing between orifices doesn't play an important role in determining the bubbling regime. Based on the experimental observations, we develop new bubbling regime maps constructed using the dimensionless Capacitance number and Weber number. (C) 2019 The Authors. Published by Elsevier Ltd.