Experiment Study of Pigging Characteristics in Horizontal Gas-Liquid Flow Pipeline With Different Pig Sizes

2012 ◽  
Author(s):  
Ruixi Duan ◽  
Da Yu ◽  
Haihao Wu ◽  
Jing Gong ◽  
Shanwei Hu ◽  
...  
Keyword(s):  
Water Flow ◽  
Liquid Flow ◽  
Pipe Wall ◽  
Flow Conditions ◽  
Experiment Study ◽  
Liquid Holdup ◽  
Long Distance ◽  
Inner Diameter ◽  
Gas Liquid Flow ◽  
The Relationship

During pigging process of long-distance pipeline, pig seals wear due to abrasion on pipe wall, the diameter of seal decreases and even to be smaller than pipe inner diameter as a result. This study has researched the characteristics of pigging processes using pigs different in diameter in horizontal experimental pipe. In the study, mandrel pig with two seals was chosen for experiment. Five pigs different in size were used, and pigging experiments under various flow conditions were carried out in a horizontal air-water flow experimental loop. During experiment, the features of pigging process from pig launcher to trap were observed, the liquid holdup and pressure were detected and collected, pig velocities in different sections of pipe were measured, the velocity of pigging slug front and length of the slug were also measured. The relationship between pig movement and flow conditions was analyzed, the methods to calculate velocity of pigging slug front and length of the slug were obtained and the results calculated were similar to the results measured. Based on the results of experiment, some suggestions were proposed for pigging operation in real pipeline.

scholarly journals Study of Gas-Water Flow Inside of a Horizontal Passive Cyclonic Gas-Liquid Phase Separator System Using Displacement-Current Phase Tomography

2020 ◽  
Vol 6 (2) ◽  
pp. 28-43
Author(s):  
Joshua N. Sines ◽  
Benjamin J. Straiton ◽  
Christopher E. Zuccarelli ◽  
Qussai M. Marashdeh ◽  
Fernando L. Teixeira ◽  
...  
Keyword(s):  
Angular Velocity ◽  
Water Flow ◽  
Flow Rate ◽  
Liquid Flow ◽  
Current Phase ◽  
Displacement Current ◽  
Air Flow Rate ◽  
Liquid Holdup ◽  
Flow Rates ◽  
Gas Liquid Flow

AbstractPassive cyclonic gas-liquid separators (PCGLSs) are commonly used in microgravity conditions where gravity settling separation is difficult or impossible. In this study, displacement-current phase tomography (DCPT) is used to measure various features of the gas-liquid flow inside of a PCGLS. The liquid holdup, liquid angular velocity, and gas core size are investigated. The liquid holdup is also measured in a gas-liquid flow that simulates the injection flow for a PCGLS. It is found that the gas core contracts and expands in a periodic motion as air is injected with water. This motion becomes more noticeable as the air flow rate is increased. It is also found that the liquid layer angular velocity has a positive linear trend with the air flow rate under constant water flow rates. A basic linear relation is derived to relate the liquid angular velocity to the air and water flow rates. All DCPT and electrical capacitance phase tomography (ECVT) results closely match the visual confirmation methods used for each flow feature.

Hydrodynamics of gas-liquid flow in micropacked beds: Pressure drop, liquid holdup, and two-phase model

AIChE Journal ◽  
2017 ◽  
Vol 63 (10) ◽  
pp. 4694-4704 ◽  
Author(s):  
Jisong Zhang ◽  
Andrew R. Teixeira ◽  
Lars Thilo Kögl ◽  
Lu Yang ◽  
Klavs F. Jensen
Keyword(s):  
Pressure Drop ◽  
Liquid Flow ◽  
Phase Model ◽  
Liquid Holdup ◽  
Two Phase ◽  
Gas Liquid Flow

Comparison of Liquid-Holdup and Friction-Factor Correlations for Gas-Liquid Flow

1975 ◽  
Vol 27 (05) ◽  
pp. 564-568 ◽  
Author(s):  
I.R. Vohra ◽  
F. Hernandez ◽  
N. Marcano ◽  
J.P. Brill
Keyword(s):  
Friction Factor ◽  
Liquid Flow ◽  
Liquid Holdup ◽  
Gas Liquid Flow

Continuous Wavelet Transforms of Instantaneous Wall Pressure in Slug and Churn Upward Gas-Liquid Flow

2002 ◽  
Vol 124 (3) ◽  
pp. 625-633 ◽  
Author(s):  
Heather L. McClusky ◽  
Mary V. Holloway ◽  
Donald E. Beasley ◽  
Jay M. Ochterbeck
Keyword(s):  
Liquid Flow ◽  
Wavelet Transforms ◽  
Slug Flow ◽  
Time Dependent ◽  
Continuous Wavelet ◽  
Frequency Content ◽  
Flow Conditions ◽  
Continuous Wavelet Transforms ◽  
Gas Liquid Flow ◽  
Churn Flow

Continuous wavelet transforms are employed to determine the time-localized frequency content (scalogram) of instantaneous wall pressure signals in upward gas-liquid flow. The flow conditions correspond to well-defined slug flow, well-defined churn flow, and flows near the transition from slug-to-churn flow. Scalograms demonstrate that the frequency content of the pressure signals is time-dependent, and visual observations of the flow conditions suggest that the time-dependent frequencies are related to identifiable physical behaviors of the flow. In well-defined slug flow, the scalograms are characterized by the presence of a dominant frequency throughout the duration of the signal and by frequency shifting events. Scalograms representing well-defined churn flow contain intermittent frequencies, and the energy density in churn flow is spread over a wider range of frequencies than in slug flow. The present results provide evidence that flows near transition alternately display characteristics of both well-defined slug and well-defined churn flows.

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