水平管道中气体和剪切稀化流体的段塞流

IF 3.6 2区 工程技术 Q1 MECHANICS
R. Baungartner , G.F.N. Gonçalves , J.B.R. Loureiro , A.P. Silva Freire
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引用次数: 1

摘要

在44.2 mm内径水平管内,以空气和3种羧甲基纤维素(CMC)溶液(0.05、0.1和0.2% w/w)进行段塞流实验。通过高速数码相机获得了大气泡的长度、速度和通过频率。同时还估算了液体段塞的气体含量和长度。用差压传感器测量沿管道的压力变化。采用粒子图像测速法获得了连续液场在膜区和段塞区的平均速度。在48种不同的实验条件下,将测试的气液表面速度和不同的流体流变性相结合。流动行为被发现强烈地依赖于连续相的流变特性。特别是液体段塞内气体体积分数(α=1−Rs)、大气泡通过频率(νt)和压力变化均有所增加。提出了新的α和ν的表达式来解释液相的流变性。通过两种修正的力学模型得到的流动参数预测结果与实验数据进行了比较。Anbarlooei等人提出的摩擦系数表达式。Rev. E, 92(6), 5 - 9,2015)也进行了测试。评估了所提出的修正对段塞流计算性质的影响;参数预测的典型均方根误差小于15%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Slug flows of gas and shear-thinning fluids in horizontal pipes

Experiments on slug flow are carried out with air and three solutions of carboxymethylcellulose (CMC)(0.05, 0.1 and 0.2% w/w) in a 44.2 mm ID horizontal pipe. The lengths, velocities and frequency of passage of the large bubbles are obtained through a high-speed digital camera. The gas fraction and length of liquid slugs are also estimated. Pressure changes along the pipe are measured with a differential pressure transducer. Particle Image Velocimetry is used to obtain the mean velocity of the continuous liquid field in the film and slug regions. The combination of tested gas and liquid superficial velocities and of distinct fluid rheology results in 48 different experimental conditions. The flow behavior is found to be strongly dependent on the rheological properties of the continuous phase. In particular, the gas volume fraction within the liquid slug (α=1Rs), the passage frequency of the large bubbles (νt) and the pressure changes are increased. New expressions are proposed for α and νt to account for the rheology of the liquid phase. Predictions of the flow parameters obtained through two modified mechanistic models are compared with the experimental data. The friction coefficient expression proposed by Anbarlooei et al. (Phys. Rev. E, 92(6), 5–9, 2015) is also tested. The impact of the proposed modifications on the calculated properties of slug flow is assessed; typical RMS-errors of less than 15% are obtained for parameter predictions.

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来源期刊
CiteScore
7.30
自引率
10.50%
发文量
244
审稿时长
4 months
期刊介绍: The International Journal of Multiphase Flow publishes analytical, numerical and experimental articles of lasting interest. The scope of the journal includes all aspects of mass, momentum and energy exchange phenomena among different phases such as occur in disperse flows, gas–liquid and liquid–liquid flows, flows in porous media, boiling, granular flows and others. The journal publishes full papers, brief communications and conference announcements.
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