Characterization of two-phase slug flow sub-regimes using flow visualization
TL;DR: In this paper, the internal structure of different sub-regimes of slug flow is analyzed and five distinct slug flow subregimes are identified based on the visual observations, which correspond to slug at formation stage (onset of slug); less aerated slug; highly aerated slugs; slug and plug; and slug and wavy.
About: This article is published in Journal of Petroleum Science and Engineering.The article was published on 2015-11-01. It has received 52 citations till now. The article focuses on the topics: Slug flow & Flow visualization.
Citations
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TL;DR: In this article, a gas-liquid slug two-phase flow in a horizontal pipe was carried out to investigate the initiation and flow development mechanisms, and the slug initiation mechanisms were explained by visual observation and pressure fluctuations.
68 citations
TL;DR: In this paper, the authors developed a regime map showing possible erosion and corrosion phenomena due to intermittent flows in pipe, which is represented in terms of non-dimensional superficial Reynolds numbers of both the phases to account for pipe diameter, flow rate and fluid viscosity.
51 citations
TL;DR: In this article, a two-phase flow regime identification in a horizontal pipe was realized based on the liquid phase velocity information and the machine learning method using statistical features extracted from the velocity time series data, such as mean, root mean square and power spectral density.
Abstract: Two-phase flow regime identification in a horizontal pipe was realized based on the liquid phase velocity information and the machine learning method. Ultrasound Doppler velocimetry was employed to measure the liquid velocity. Statistical features extracted from the velocity time series data, such as mean, root mean square, and power spectral density, were used to realize real-time flow regime identification. In addition, two novel parameters—maximum velocity ratio and maximum velocity difference ratio—were proposed to identify plug and decaying slug flow. Different classification algorithms were employed to achieve a high identification accuracy. Moreover, transient flow regime identification with a fast response was realized based on two classification algorithms—long–short term memory and convolutional neural network. The results show that the accuracy of real-time flow regime identification based on a flow regime map can reach up to 93.1% using support vector machine, the maximum velocity ratio and maximum velocity difference ratio are effective in identifying plug and decaying slug flow, and transient flow regime identification under slug flow condition can be realized with an accuracy of 94% based on a convolutional neural network (CNN). Decaying slugs with long lengths confuse the CNN and are responsible for the error in identification. The results presented herein are expected to expand the available knowledge on two-phase flow regime identification.
49 citations
TL;DR: In this article, the hydrodynamic characteristics of the near- transition to slug flow of air-water two-phase flow in horizontal pipes were investigated experimentally for inner pipe diameters of 16,mm, 26,mm and 50 mm.
35 citations
TL;DR: In this paper, the authors analyzed the mechanism responsible for plug to slug transition and associated dynamics of bubble detachment from the elongated bubble using flow visualization and local velocity measurements using FASTCAM Photron camera and a 3D automated traverse system.
32 citations
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TL;DR: In this article, a generalized flow regime map based on this theory is presented, which is used for determining flow regime transitions in two-phase gas-liquid flow, and the mechanisms for transition are based on physical concepts and are fully predictive.
Abstract: Models are presented for determining flow regime transitions in two-phase gas-liquid flow. The mechanisms for transition are based on physical concepts and are fully predictive in that no flow regime transitions are used in their development. A generalized flow regime map based on this theory is presented.
2,420 citations
TL;DR: Govier and Aziz as mentioned in this paper used flow pattern maps for two-phase gas-liquid flow in horizontal pipes and compared them with the 5935 flow pattern observations currently contained in the UC Multiphase Pipe Flow Data Bank.
1,065 citations
TL;DR: In this paper, a simple criterion for the transition from stratified flow to the slug or plug flow regime in horizontal rectangular ducts is presented and a theoretical model is developed and shown to be consistent with data obtained by blowing air over stationary water in channels with a wide range of geometrical parameters.
240 citations
TL;DR: In this paper, the authors explored the application of linear stability theory to explain the onset of slugging and showed that the inviscid Kelvin-Helmholtz theory correctly predicts stability of a stratified flow only for very large liquid viscosities.
237 citations
215 citations