An Experimental Study of Two-Phase Slug Flow in Hilly Terrain Pipelines

1995 ◽  
Vol 10 (04) ◽  
pp. 233-240 ◽  
Author(s):  
Guohua H. Zheng ◽  
J.P. Brill ◽  
Ovadia Shoham
Keyword(s):  
Experimental Study ◽  
Slug Flow ◽  
Hilly Terrain ◽  
Two Phase

An Investigation of Slug Flow in Hilly Terrain Pipelines

2001 ◽  
Author(s):  
Suat Bagci ◽  
Adel Al-Shareef
Keyword(s):  
Liquid Film ◽  
Slug Flow ◽  
Flow Characteristics ◽  
Source Model ◽  
Pipe Diameter ◽  
Liquid Holdup ◽  
Hilly Terrain ◽  
Two Phase ◽  
Flow Interactions ◽  
Inclined Pipes

Abstract Two-phase flow in hilly terrain pipelines can cause significant practical operating problems. When slugs flow in a hilly terrain pipeline that contains sections of different inclinations they undergo a change of length and slug flow characteristics as the slug move from section to section. In addition, slugs can be generated at low elbows, dissipate at top elbows and shrink or grow in length as they travel along the pipe. A mathematical model and a computer program was developed to simulate these phenomena. The model was based on the sink/source concept at the pipeline connections. A connection between two pipeline sections of different slopes was conveniently called elbow. An elbow accumulates liquid as a sink, and releases liquid as a source. The sink/source has a characteristic capacity of its own. This capacity is positive if the liquid can indeed be accumulated at the elbow or negative if the liquid is actually drained away from the elbow. This type of treatment effectively isolates the flow upstream from an elbow from that downstream, while still allowing flow interactions between two detailed pipeline sections. The hydrodynamic flow model was also used to calculate the film liquid holdup in horizontal and inclined pipelines. The model can successfully predict the liquid film holdup if the liquid film height is assumed to be uniform through the gas pocket. Many other models were used to calculate all the needed parameters to perform the sink/source model. The overall effect of a hill or terrain on slug flow depends on the operating flow rates and pipeline configurations. For special case of near constant slug frequency corresponding to moderately high superficial liquid and gas velocities, this effect was found to be small. The changes in the film characteristics between two adjacent pipeline sections were found to be mostly responsible for the pseudo-slug generation, slug growth and dissipation in the downstream pipeline sections. The film liquid holdup decreased with increasing pipe diameter. The unit slug length increased at the upstream inclined pipes and decreased at the downstream inclined pipes with increasing pipe diameter. The possibility of pseudo-slug generation was increased at large pipe diameters even at high sink capacities. At low sink capacities, no pseudo-slugs were generated at high superficial velocities. The slug flow characteristics was more effected by low superficial gas and liquid velocities, large pipe diameters and shallow pipeline inclinations.

Transient Two-Phase Flow Model for High Viscous Liquids Over Hilly Terrain

2014 ◽  
Author(s):  
Abraham Parra ◽  
Miguel Asuaje
Keyword(s):  
Slug Flow ◽  
Mechanical Design ◽  
Fluid Model ◽  
Process Equipment ◽  
Maximum Deviation ◽  
Multiphase Model ◽  
Viscous Effects ◽  
Hilly Terrain ◽  
Two Phase ◽  
Wide Range

This paper presents the detailed development of a multiphase model to predict the behavior of terrain-induced slugging, influenced by the viscous effects and hilly terrain. Currently, high viscosity heavy crude oil represents most of the available fossil resources. This crude flows inside long and expensive pipelines, usually over hilly terrain, causing the formation of slug flow. A very common flow pattern produces critical effects on pipelines in terms of modelling, mechanical stress, induced oscillations, fatigue, production losses, and other negative effects for the system. An accurate characterization of this pattern may give critical data for the mechanical design of piping systems and provide valuable information for the downstream process equipment selection. At present, most of the existing models to predict the behavior of slug flow neglect relevant parameters such as the effect of liquid viscosity and the effect of topographic terrain profile. The objective of this study is to present a mechanistic fluid model to determine the behavior of slug flow affected by the hilly terrain using viscous fluids. The model predicts the four stages of slug flow proposed by Schmidt et al. [1], and extends these stages to hilly terrain systems. The model is valid for a wide range of fluid viscosities and considers a range of pipe inclinations between 0° and 90°. Model validation with available literature and experimental data, shows a maximum deviation of 6%.

An Experimental Study on Air-Water Two-Phase Flow Patterns in Pebble Beds

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Bai Bofeng ◽  
Liu Maolong ◽  
Su Wang ◽  
Zhang Xiaojie
Keyword(s):  
Experimental Study ◽  
Flow Pattern ◽  
Test Section ◽  
Slug Flow ◽  
Annular Flow ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Pattern Transition

An experimental study was conducted on the air-water two-phase flow patterns in the bed of rectangular cross sections containing spheres of regular distribution. Three kinds of glass spheres with different diameters (3 mm, 6 mm, and 8 mm) were used for the establishment of the test section. By means of visual observations of the two-phase flow through the test section, it was discovered that five different flow patterns occurred within the experimental parameter ranges, namely, bubbly flow, bubbly-slug flow, slug flow, slug-annular flow, and annular flow. A correlation for the bubble and slug diameter in the packed beds was proposed, which was an extended expression of the Tung/Dhir model, Jamialahmadi’s model, and Schmidt’s model. Three correlations were proposed to calculate the void friction of the flow pattern transition in bubble flow, slug flow, and annular flow based on the bubble model in the pore region. The experimental result showed that the modified Tung and Dhir model of the flow pattern transition was in better agreement with the experimental data compared with Tung and Dhir’s model.

EXPERIMENTAL STUDY OF TWO-PHASE GAS-LIQUID SLUG FLOW WITH A SLIGHT DIRECTION CHANGE

2015 ◽  
Author(s):  
Rafael Fabricio Alves ◽  
Andressa Carolinne Del Monego ◽  
Cristiane Cozin ◽  
Fausto Arinos de Almeida Barbuto ◽  
Fábio Alencar Schneider ◽  
...  
Keyword(s):  
Experimental Study ◽  
Slug Flow ◽  
Liquid Slug ◽  
Two Phase ◽  
Direction Change

Experimental study of the characteristics of an upward two-phase slug flow in a vertical pipe

2018 ◽  
Vol 108 ◽  
pp. 428-437 ◽  
Author(s):  
Faiza Saidj ◽  
Abbas Hasan ◽  
Hiba Bouyahiaoui ◽  
Ammar Zeghloul ◽  
Abdelwahid Azzi
Keyword(s):  
Experimental Study ◽  
Slug Flow ◽  
Vertical Pipe ◽  
Two Phase

Experimental study and CFD modelling of a two-phase slug flow for an airlift tubular membrane

2009 ◽  
Vol 64 (16) ◽  
pp. 3576-3584 ◽  
Author(s):  
N. Ratkovich ◽  
C.C.V. Chan ◽  
P.R. Berube ◽  
I. Nopens
Keyword(s):  
Experimental Study ◽  
Slug Flow ◽  
Cfd Modelling ◽  
Two Phase ◽  
Tubular Membrane

Experimental Study of Paraffin Deposition Under Two-Phase Gas/Oil Slug Flow in Horizontal Pipes

2017 ◽  
Vol 32 (01) ◽  
pp. 099-117 ◽  
Author(s):  
Ake Rittirong ◽  
Ekarit Panacharoensawad ◽  
Cem Sarica
Keyword(s):  
Experimental Study ◽  
Slug Flow ◽  
Gas Oil ◽  
Two Phase ◽  
Horizontal Pipes
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