Investigations of the Formation Mechanism and Pressure Pulsation Characteristics of Pipeline Gas-Liquid Slug Flows
Abstract
:1. Introduction
2. Mathematical Models
2.1. Pipe Segment Slug Flow Model
2.2. Turbulent Kinetic Energy Model of Pipeline Slug Flow
2.3. Interface Refactoring Methodology
3. Pipeline Slug Flow Dynamics Model
3.1. Geometrical and Numerical Modeling
3.2. Initial and Boundary Conditions
3.3. Grid Independence and Model Validation
4. Results and Discussion of Segmental Slug Flow
4.1. Slugging Characteristics of Horizontal Pipe Section Slug Flow
4.2. Formation and Evolutionary Characteristics of Riser Section Slug Flow
4.3. Pressure Pulsation Characteristics of Pipe Section Slug Flow
4.4. Gas Content Characteristics of Segmented Slug Flow
5. Conclusions
- (1)
- A two-phase severe slug flow dynamics model based on an improved VOF-PLIC coupling method is built up to investigate the formation mechanisms of gas-liquid slug flows. An artificial compression term is added to the transport equations to reduce the fuzzy boundary between the gas-liquid coupling interfaces. The slugging phenomenon occurs at the gas-liquid interface, and the slug frequency reaches its peak. The slug length changes irregularly during the development of the slug, reflecting the randomness of the slug merging and disappearing phenomena.
- (2)
- Gas velocity has an essential effect on the structure of long bubbles. Due to the loss of energy generated by the fluid, the head of the long bubble becomes wedge-shaped at high air speeds, the pressure at liquid film head rises, and the gas pushes of liquid film areas are pressurized.
- (3)
- Gas-liquid two-phase forms alternately at the riser outlet out of the slug flow eruption phenomenon, and the pi** system of a severe segment slug flow with transient flow characteristics has prominent cycle characteristics.
- (4)
- When the pipe flow rate is low, liquid forms a liquid slug at the lowest location of the horizontal pipe. When the air flow rate is gradually increased, the riser will not appear as a gas cut-off phenomenon; the liquid intermittently goes out of the mouth of the pipe and begins the formation of a severe section of the slug flow.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Fluid Medium | Density (kg/m3) | Dynamic Viscosity (mPa⋅s) | Apparent Velocity (m/s) |
---|---|---|---|
Water | 998.203 | 1.01 | 0.28–1.42 |
Air | 1.205 | 1.79 × 10−2 | 0.17–1.36 |
Maximum Unit Size/mm | Total Number of Units | Maximum Static Pressure/Pa | Relative Error/% |
---|---|---|---|
0.005 | 578,469 | 4842 | / |
0.003 | 806,580 | 4861 | 0.39 |
0.002 | 1,138,548 | 4876 | 0.31 |
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© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
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Zheng, G.; Xu, P.; Li, L.; Fan, X. Investigations of the Formation Mechanism and Pressure Pulsation Characteristics of Pipeline Gas-Liquid Slug Flows. J. Mar. Sci. Eng. 2024, 12, 590. https://doi.org/10.3390/jmse12040590
Zheng G, Xu P, Li L, Fan X. Investigations of the Formation Mechanism and Pressure Pulsation Characteristics of Pipeline Gas-Liquid Slug Flows. Journal of Marine Science and Engineering. 2024; 12(4):590. https://doi.org/10.3390/jmse12040590
Chicago/Turabian StyleZheng, Gaoan, Pu Xu, Lin Li, and **nghua Fan. 2024. "Investigations of the Formation Mechanism and Pressure Pulsation Characteristics of Pipeline Gas-Liquid Slug Flows" Journal of Marine Science and Engineering 12, no. 4: 590. https://doi.org/10.3390/jmse12040590