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Rao Y, Hu Y, Wang S, Zhao S, Zhou S. Numerical Simulation Study on the Flow Field and Separation Efficiency by Built-In Twisted Tape in the Hydrocyclone. ACS Omega 2023; 8:26301-26316. [PMID: 37521627 PMCID: PMC10373205 DOI: 10.1021/acsomega.3c02549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Accepted: 06/29/2023] [Indexed: 08/01/2023]
Abstract
Aiming at the separation of mud and sand in natural gas hydrate, for the designed built-in twisted tape hydrocyclone, the numerical simulation method was used to study the effects of different types of built-in twisted tape and operating conditions on the internal flow field of the hydrocyclone, separation efficiency, and influence of hydrate particle size distribution. The research results show that the built-in twisted tape has the same swirling direction as the hydrocyclone, which is beneficial to improving the swirling intensity, and the ability to carry and separate solid particles is obviously enhanced. The built-in twisted tape hydrocyclone with a length of 300 mm has better separation efficiency and internal flow field stability. By changing the conditions of the inlet velocity and the initial concentration of hydrate particles, the comparison shows that when the inlet velocity is 8 m/s, the volume of mud and sand is 25%, the initial concentration of hydrate particles is 15%, and the built-in tape is 300 mm long. The tape hydrocyclone has the best separation efficiency. Compared with the basic hydrocyclone, the built-in twisted tape hydrocyclone with a length of 300 mm increases the separation efficiency of mud and sand by 7.49%, while the pressure drop only increases by 2.67%, showing the superiority of the built-in twisted tape structure.
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Affiliation(s)
- Yongchao Rao
- Jiangsu
Key Laboratory of Oil−Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China
- School
of Petroleum and Gas Engineering, School of Energy, Changzhou University, Changzhou, Jiangsu 213164, China
| | - Yong Hu
- Jiangsu
Key Laboratory of Oil−Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China
- School
of Petroleum and Gas Engineering, School of Energy, Changzhou University, Changzhou, Jiangsu 213164, China
| | - Shuli Wang
- School
of Energy, Quanzhou Vocational and Technical
University, Quanzhou, Fujian 362268, China
| | - Shuhua Zhao
- Jiangsu
Key Laboratory of Oil−Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China
- School
of Petroleum and Gas Engineering, School of Energy, Changzhou University, Changzhou, Jiangsu 213164, China
| | - Shidong Zhou
- Jiangsu
Key Laboratory of Oil−Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China
- School
of Petroleum and Gas Engineering, School of Energy, Changzhou University, Changzhou, Jiangsu 213164, China
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Liu W, Lv X, Jiang S, Li H, Zhou H, Dou X. Two-phase flow pattern identification in horizontal gas–liquid swirling pipe flow by machine learning method. ANN NUCL ENERGY 2023. [DOI: 10.1016/j.anucene.2022.109644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Adeyemi I, Kharoua N, Khezzar L, Meribout M, Alhammadi K. Review of confined swirling flows and bluff body impacts on flow and heat transfer characteristics. Chem Eng Res Des 2022; 187:359-86. [DOI: 10.1016/j.cherd.2022.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Liu W, Lv X, Jiang S, Li H, Zhou H, Dou X. Gas–liquid two-phase flow patterns and pressure drop of decaying swirling flow inside a horizontal pipe. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.118281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Rao Y, Wang S, Li L. Numerical Simulation of the Flow Pattern of Spiral Annular Flow with a Guide Strip by Spiral On-Way. ACS Omega 2022; 7:31961-31973. [PMID: 36120054 PMCID: PMC9475622 DOI: 10.1021/acsomega.2c02924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 08/12/2022] [Indexed: 06/15/2023]
Abstract
To study the gas-liquid two-phase spiral annular flow pattern and its conversion law in a horizontal tube with twist tape by spiral on-way, a numerical simulation is carried out using the RNG k-ε model, and the DPM model is adopted as the particle motion model. The research results show that three main flow patterns are obtained, which are spiraling churn flow, spiraling annular flow, and spiraling annular twine flow. The ratio of the liquid-phase to gas-phase velocity V L/V G is the main factor that affects the existence of the gas phase. When V L/V G > 1/2, the flow pattern is a spiral cluster flow; when 1/5 < V L/V G< 1/2, the flow pattern is a spiral annular flow; and when V L/V G < 1/5, the flow pattern is a spiral annular flow. Compared with the flow pattern of the local spiral flow pattern of the short twisted band, it was found that the occurrence conditions of annular flow were postponed and a new flow pattern appeared. The research results of this paper have guiding significance for the pipeline risk management of natural gas hydrates and the engineering application of the full rotation of guide strips.
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Affiliation(s)
- Yongchao Rao
- Jiangsu
Key Laboratory of Oil-Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China
- School
of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
| | - Shuli Wang
- School
of Energy, Quanzhou Vocational and Technical
University, Quanzhou, Fujian 362268, China
| | - Lijun Li
- China
Petroleum & Chemical Corporation North China Oil & Gas Company, Zhengzhou, Henan 450006, China
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Liu W, Lv X, Zhou H, Dou X. The effect of decay on churn flow transition in a vertical gas–liquid swirling flow. Chem Eng Sci 2022; 259:117843. [DOI: 10.1016/j.ces.2022.117843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Rao Y, Liu Z, Wang S, Li L. Numerical Simulation on the Flow Pattern of a Gas-Liquid Two-Phase Swirl Flow. ACS Omega 2022; 7:2679-2689. [PMID: 35097266 PMCID: PMC8793073 DOI: 10.1021/acsomega.1c05144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 01/05/2022] [Indexed: 06/14/2023]
Abstract
The gas-liquid contact area can be increased by the gas-liquid swirl flow, and the heat and mass transfer efficiency between gas and liquid can be enhanced by the gas-liquid swirl flow. The gas hydrate formation can be promoted by the swirl flow. The swirl flow can ensure the safety of the natural gas hydrate slurry. The flow pattern and conversion law of gas-liquid swirl with a twist tape should be investigated, and numerical simulation has been carried out by using the Reynolds stress model and the level set model. As a result, four different flow patterns are obtained, namely, swirl-stratified flow, swirl bubble flow, swirl slug flow, and swirl annular flow. The influence of gas-liquid-phase velocity on the flow pattern is investigated. The drag force generated by the two-phase slip velocity can change the gas form. At the same time, the flow pattern at different positions of the pipe will also change because of the attenuation of the swirl flow. Finally, the flow pattern map of the gas-liquid swirl flow is accomplished, and it is compared with the Mandhane flow pattern map. The flow boundary of the swirl bubble flow and the swirl annular flow is predicted.
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Affiliation(s)
- Yongchao Rao
- Jiangsu
Key Laboratory of Oil-Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China
- School
of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
| | - Zehui Liu
- Jiangsu
Key Laboratory of Oil-Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China
- School
of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
| | - Shuli Wang
- School
of Energy, Quanzhou Vocational and Technical
University, Quanzhou, Fujian 362268, China
| | - Lijun Li
- Jiangsu
Key Laboratory of Oil-Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China
- School
of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
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Abstract
In deep ocean transportation pipeline, the swirling internal flow has a significant impact on the marine minerals transportation efficiency and safety. Therefore, the present work investigates various swirl flow motions for the slurry transport characteristics of the multi-sized particulate flow in a horizontal pipeline. Since the internal flow is a liquid-solid-solid mixture, a steady-state three-dimensional Eulerian-Eulerian multiphase approach in conjunction with the k-ω SST turbulence model is implemented for numerical simulation in the commercial CFD software ANSYS FLUENT 17.0. Numerical predictions of the mixture solid concentration distributions are generally in good conformance with experimental measurements. It is clearly revealed the transition of flow regime from heterogeneous to pseudo-homogeneous with the increasing level of swirl intensity at inlet. Compared to non-swirling flow, the swirling flow is of benefit to the multi-sized solid suspension capacity and the transportation efficiency. Moreover, the intense swirling vortex results in a strong influence on the characteristics of the lubrication layer formed by fine solid particles near the bottom of the pipe. These results provide valuable insights regarding the influence of swirl flow on the transport process for deep ocean mining.
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