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Phase volume fraction measurement of slug flow with surfactant based on an image-quick closing valve method
Flow Measurement and Instrumentation ( IF 2.2 ) Pub Date : 2021-01-12 , DOI: 10.1016/j.flowmeasinst.2020.101881
Pengbo Yin , Xuewen Cao , Pan Zhang , Jiang Bian , Xiang Li , Qianrong Zhang

The characteristics of gas–liquid two-phase flow with surfactant have been extensively investigated, and phase volume fraction measurements are commonly performed using the electrical conductivity and quick closing valve (QCV) methods. However, these methods have obvious deficiencies caused by the effects of foam formation. In this study, a phase volume fraction measuring scheme was proposed for slug flow with surfactant based on the image-QCV method. First, a QCV system and a high-speed camera system were triggered synchronously; the fluids were measured, and images were captured. Then, the level set method without re-initialization was employed for the image segmentation of the fluid characteristic structures. The volumes of the characteristic structures were evaluated via contour extraction, proportion calculation, and image correction. Eventually, the phase volume fraction was acquired using fluid distribution characteristics. The measuring results show that the liquid volume fraction of the liquid slug with surfactant decreases significantly compared to that for the air–liquid slug flow. With an increase in the superficial gas velocity and surfactant concentration, the gas volume fraction increases whereas the liquid volume fraction and foam quality decrease in the liquid slug with surfactant.



中文翻译:

基于图像快速关闭阀方法的表面活性剂对团状流相体积分数的测量

广泛研究了含表面活性剂的气液两相流的特性,通常使用电导率和快速关闭阀(QCV)方法进行相体积分数的测量。但是,这些方法由于泡沫形成的影响而具有明显的缺陷。在这项研究中,提出了一种基于图像-QCV方法的表面活性剂相塞流相体积分数测量方案。首先,QCV系统和高速摄像系统被同步触发。测量液体,并捕获图像。然后,将没有重新初始化的水平设定方法用于流体特征结构的图像分割。通过轮廓提取,比例计算和图像校正来评估特征结构的体积。最终,利用流体分布特征获得了相体积分数。测量结果表明,与空气-液体团流相比,含表面活性剂的液体团的液体体积分数显着降低。随着表观气体速度和表面活性剂浓度的增加,带有表面活性剂的液体段塞中的气体体积分数增加,而液体体积分数和泡沫质量降低。

更新日期:2021-01-21
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