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Atmosphere
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CFD Modeling in Gas-Liquid Separators
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CFD Modeling in Gas-Liquid Separators

A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Air Pollution Control".

Deadline for manuscript submissions: closed (15 March 2023) | Viewed by 6024

Special Issue Editors

Dr. Xuelong Yang

E-Mail Website
Guest Editor
College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 314423, China
Interests: moisture separation; liquid–gas jet pump; ejector; multiphase flow
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Wensheng Zhao

E-Mail Website
Guest Editor
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
Interests: fluid–structure interactions; multiphase flow; gas–liquid mass transfer
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Gas–liquid separators are a device for separating liquid droplets (fog droplets) from gas. They are widely used in air pollution prevention, petroleum, chemical industry, natural gas, nuclear power, shipbuilding, seawater desalination, and other industries. Based on the different mechanisms of gas–liquid separation, gravity sedimentation separation, filtration separation, inertia separation, electrostatic separation, centrifugal separation, and other technologies have been formed, as well as separation devices with various structures.

In the actual operation of gas–liquid separators in different industries, due to the complex interaction between droplets, liquid film, and gas, the internal flow and separation processes are extremely complex. Limited by experimental technology, cost, and other factors, these complex phenomena are difficult to observe and test, while CFD technology can make up for this deficiency. Therefore, more and more scholars are using CFD technology to carry out performance prediction, structure optimization, and flow and separation mechanism research for gas–liquid separators. Due to the complexity of multiphase flow, CFD calculation still faces many challenges in the modeling, simulation, and analysis of gas–liquid separators.

The purpose of this Special Issue is to gather new research contributions on CFD calculation and analysis of gas–liquid separators (in the form of research articles, review articles, and brief communications). We welcome submissions from different research fields, from science to engineering, covering theory, simulation, and application. The topics of this Special Issue include but are not limited to the mechanism and process of oil–gas separation, steam (air)–water separation, separator design and optimization, and application expansion.

Dr. Xuelong Yang
Prof. Dr. Wensheng Zhao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Atmosphere is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • gravity separation
  • centrifugal separation
  • inertial separation
  • moisture separation
  • cyclone separator
  • vane separator
  • demister
  • dryer
  • GLCC

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Published Papers (3 papers)

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Research

15 pages, 4164 KiB  
Article
Study on Performance and Operation Mechanism of a Separation Equipment for a PWR Steam Generator
by Xuelong Yang, Chenbing Zhu, Qiwei Zhou, Jianchong Chen and Jiegang Mou
Atmosphere 2023, 14(3), 451; https://doi.org/10.3390/atmos14030451 - 23 Feb 2023
Cited by 2 | Viewed by 2278
Abstract
Computational fluid dynamics (CFD) is adopted to calculate and analyze the performance and separation mechanism of a steam-water separation equipment for a pressurized water reactor (PWR) steam generator. The steam-water two-phase flow is simulated by the Euler two-fluid model, and several representative water [...] Read more.
Computational fluid dynamics (CFD) is adopted to calculate and analyze the performance and separation mechanism of a steam-water separation equipment for a pressurized water reactor (PWR) steam generator. The steam-water two-phase flow is simulated by the Euler two-fluid model, and several representative water droplet diameters are selected among 50 to 400 μm. The influence mechanism of water droplet diameter on the performance is investigated by analyzing the flow parameters such as phase volume fraction, velocity, and turbulent kinetic energy. The results show that the integrated calculation and analysis of the separation equipment can more truly reflect the flow state between the separators, improving the reliability of the performance prediction and mechanism analysis. With the increase in water droplet diameter, the separation efficiency of the separation equipment and each separator gradually increases, the outlet wetness gradually decreases, and the pressure loss first decreases and then stabilizes. When 400 μm is taken as the characteristic value of the actual droplet diameter distribution at the inlet of the separation equipment, the performance prediction is more accurate, the pressure loss of each separator is relatively close, and the pressure loss of the primary separator is less affected by the droplet diameter and smaller than that of the swirl-vane primary separator, which is conducive to achieving a higher circulation ratio (CR). Re-entrainment occurs at the perforations of the primary separator and the outlet of the secondary separator, and the corresponding structure is suggested to be optimized to further improve separation efficiency of the separation equipment. Full article
(This article belongs to the Special Issue CFD Modeling in Gas-Liquid Separators)
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19 pages, 6342 KiB  
Article
Numerical Investigation on the Influence of Class Number and Wavelength on the Performance of Curved Vane Demisters
by Zhen Cai, Pengfei Wang, Xiangyu Luo, Jin Huang, Zhenqi Qin, Jinna Mei and Wensheng Zhao
Atmosphere 2022, 13(10), 1711; https://doi.org/10.3390/atmos13101711 - 18 Oct 2022
Cited by 2 | Viewed by 1565
Abstract
Curved vane demisters with high efficiency are widely used in power, chemical, and gas industries. To reveal the relationship between the separation performance and the basic geometric parameters used in the steam generator. In this paper, the influence of wavelength on droplet separation [...] Read more.
Curved vane demisters with high efficiency are widely used in power, chemical, and gas industries. To reveal the relationship between the separation performance and the basic geometric parameters used in the steam generator. In this paper, the influence of wavelength on droplet separation performance has been numerically studied. Additionally, the pressure drops, friction factor, and separation efficiency of the two-phase flow are numerically analyzed. Then, grade separation efficiency is numerically investigated, and the overall separation efficiency is obtained to evaluate the separation performance. It is found that a prolonged wavelength L can initially increase and thereafter decrease the separation efficiency. However, when the wavelength increases to a high level, continuously increasing the wavelength decreases the droplet re-entrainment mass source. Full article
(This article belongs to the Special Issue CFD Modeling in Gas-Liquid Separators)
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15 pages, 5644 KiB  
Article
Optimization Design of Velocity Distribution in the Airways of the Fluidized Bed Based on CFD and Taguchi Algorithm
by Hao Yan, Shisong Liu, Fei Wang, Wei Xu, Jian Li, Tengzhou Xie and Yishan Zeng
Atmosphere 2022, 13(9), 1513; https://doi.org/10.3390/atmos13091513 - 16 Sep 2022
Cited by 2 | Viewed by 1501
Abstract
A vital component that is frequently employed in the industrial powder conveying sector is the fluidized bed. In the light of powder unloading with a fluidized bed as the research object, an orthogonal experiment with two factors and four levels was established for [...] Read more.
A vital component that is frequently employed in the industrial powder conveying sector is the fluidized bed. In the light of powder unloading with a fluidized bed as the research object, an orthogonal experiment with two factors and four levels was established for the structural parameters of the fluidized bed. In the case of different noise factors, 16 schemes are designed and all schemes via computational fluid dynamics numerical simulation. The Taguchi method and regression analysis are used to analyze the response. Finally, the accuracy of the optimization results is tested. The results show that gas velocity decreases sharply at the airway’s entrance and, then, gas flows to the second half of the airway and velocity decreases steadily and uniformly. Airway arc length L exerts a greater effect on the signal-to-noise ratio (SNR) than airway height H. The parameter combination of 180 mm L and 17 mm H for obtaining the optimal velocity distribution uniformity is determined. The test results indicate that the overall fluidization effect of the fluidized bed with the optimal parameters is better. The linked research findings can be used as a guide when designing a fluidized bed system for transporting comparable powder. Full article
(This article belongs to the Special Issue CFD Modeling in Gas-Liquid Separators)
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