Experimental investigation of air–oil slug flow using capacitance probes, hot-film anemometer, and image processing
TL;DR: In this paper, a hot-film anemometer was used to determine the time-averaged local void fraction and liquid velocity and turbulence intensity for air-oil slug flow.
About: This article is published in International Journal of Multiphase Flow.The article was published on 2011-10-01. It has received 27 citations till now. The article focuses on the topics: Slug flow & Two-phase flow.
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TL;DR: In this article, the authors present the NAC NAC-NAC-TESP, TESP-U, University of Stellenbosch/ University of Pretoria, SANERI/SANEDI, CSIR, EEDSM Hub and NAC.
53 citations
Cites background from "Experimental investigation of air–o..."
...Accurate void fraction measurements are challenging, and in most cases where void fractions were measured it was done using only one sensor for the entire test section (Ahmed, 2011; Da Silva et al., 2010; De Kerpel et al., 2013; Demori et al., 2010)....
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TL;DR: A three-dimensional universal chart of critical capillary number, which functions as static contact angle and viscosity ratio, is given to provide a guideline for oil slug simulation and a fitting formula is presented for ease of use.
Abstract: A large amount of residual oil, which exists as isolated oil slugs, remains trapped in reservoirs after water flooding. Numerous numerical studies are performed to investigate the fundamental flow mechanism of oil slugs to improve flooding efficiency. Dynamic contact angle models are usually introduced to simulate an accurate contact angle and meniscus displacement of oil slugs under a high capillary number. Nevertheless, in the oil slug flow simulation process, it is unnecessary to introduce the dynamic contact angle model because of a negligible change in the meniscus displacement after using the dynamic contact angle model when the capillary number is small. Therefore, a critical capillary number should be introduced to judge whether the dynamic contact model should be incorporated into simulations. In this study, a direct numerical simulation method is employed to simulate the oil slug flow in a capillary tube at the pore scale. The position of the interface between water and the oil slug is determine...
36 citations
TL;DR: In this paper, a one-way coupled fluid-structure framework was developed to explore the slug flow interaction with a horizontal pipe assembly under various superficial gas and liquid velocities.
30 citations
TL;DR: In this article, the mean slug translational velocity and slug liquid length were measured using Phantom 9.2 software and an image processing analysis technique using a combination of the approximate median method and blob analysis, along with an additional morphological process for detecting and segregating individual slugs.
28 citations
TL;DR: In this paper, the plug-slug transition in horizontal air-water two-phase flow in small (38.1mm) and large (101.6 mm) diameter pipes is investigated.
27 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: In this paper, the relative motion of single long air bubbles suspended in a constant liquid flow in inclined tubes has been studied experimentally, and a correlation of bubble and average liquid velocities, based on a least squares fit to the data is suggested.
444 citations
TL;DR: In this article, an experimental study has been made of the motion of long bubbles in closed vertical tubes and the influence of viscosity and surface tension on the bubble velocity is clarified.
Abstract: An experimental study has been made of the motion oflong bubbles in closed
tubes. The influence of viscosity and surface tension on the bubble velocity is
clarified. A correlation of bubble velocities in vertical tubes is suggested and is
shown to be useful for the whole range of parameters investigated. In addition,
the effect of tube inclination angle on bubble velocity is presented, and certain
features of the flow are described qualitatively.
351 citations
215 citations