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Atmosphere
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CFD Modeling in Multiphase Flow Transport/Separation Equipment
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CFD Modeling in Multiphase Flow Transport/Separation Equipment

A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Atmospheric Techniques, Instruments, and Modeling".

Deadline for manuscript submissions: closed (26 July 2024) | Viewed by 4150

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
Dr. Maosen Xu

E-Mail Website
Guest Editor
College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 314423, China
Interests: multiphase flow; jet; fluid–structure interactions

Special Issue Information

Dear Colleagues,

Multiphase flow transport/separation equipment are devices employed for transporting multiphase mixtures or separating one phase from another. They are widely applied in air pollution prevention, petroleum, the chemical industry, natural gas, nuclear power, shipbuilding, seawater desalination, and other industries. Based on the various mechanisms and application fields of multiphase flow transport/separation, gas–liquid separators, cyclone separators, vane separators, demisters, gas/liquid cylindrical cyclones (GLCCs), liquid–gas jet pumps, gas–liquid pumps, gas–liquid vortex pumps, liquid–solid jet pumps, air lift pumps, gas–solid ejectors, and other technologies have been formed with various structures.

In the actual operation of multiphase flow transport/separation equipment in various industries, due to the complex interaction between gas, liquid, bubbles, droplets, particles,  and liquid film, 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, scholars are increasingly employing CFD technology in order to carry out performance prediction, structure optimization, and flow and separation mechanism research. Due to the complexity of multiphase flow, CFD calculation still presents many challenges in the modeling, simulation, and analysis of these equipment.

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

Dr. Xuelong Yang
Prof. Dr. Wensheng Zhao
Dr. Maosen Xu
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

  • multiphase flow transport
  • multiphase flow separation
  • gas–liquid separator
  • gas–solid separator
  • liquid–gas separator
  • liquid–solid separator
  • cyclone separator
  • vane separator
  • demister
  • dryer
  • GLCC
  • liquid–gas jet pump
  • liquid–solid jet pump
  • gas–liquid mixer
  • gas–liquid ejector
  • gas–solid ejector
  • gas–liquid pump
  • gas–liquid vortex pump
  • air lift pump

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Published Papers (3 papers)

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Research

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19 pages, 8844 KiB  
Article
Applicability Study of Euler–Lagrange Integration Scheme in Constructing Small-Scale Atmospheric Dynamics Models
by Xiangqian Wei, Yi Liu, Jun Guo, Xinyu Chang and Haochuan Li
Atmosphere 2024, 15(6), 644; https://doi.org/10.3390/atmos15060644 - 27 May 2024
Cited by 1 | Viewed by 1316
Abstract
The atmospheric flow field and weather processes exhibit complex and variable characteristics at small scales, involving interactions between terrain features and atmospheric physics. To investigate the mechanisms of these process further, this study employs a Lagrangian particle motion model combined with a Euler [...] Read more.
The atmospheric flow field and weather processes exhibit complex and variable characteristics at small scales, involving interactions between terrain features and atmospheric physics. To investigate the mechanisms of these process further, this study employs a Lagrangian particle motion model combined with a Euler background field approach to construct a small-scale atmospheric flow field model. The model streamlines the modeling process by combining the benefits of the Lagrangian dynamics model and the Eulerian integration scheme. To verify the effectiveness of the Euler–Lagrange hybrid model, experiments using the Fluent wind field model were conducted for comparison. The results show that both models have their advantages in handling terrain-induced wind fields. The Fluent model excels in simulating the general characteristics of wind fields under specific terrain, while the Euler–Lagrange hybrid model is better at capturing the upstream and downstream disturbances of the terrain on the atmospheric flow field. These findings provide powerful tools for in-depth diagnostic analysis of atmospheric flow simulation and convective precipitation processes. Notably, the Euler–Lagrange hybrid model demonstrates excellent computational efficiency, with an average computation time of approximately 2 s per time step in a Python environment, enabling rapid simulation of 40 time steps within approximately 90 s. Full article
(This article belongs to the Special Issue CFD Modeling in Multiphase Flow Transport/Separation Equipment)
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18 pages, 19357 KiB  
Article
Flow Channel Optimization to Improve the Performance of a Liquid–Gas Ejector for an Intelligent Toilet Spray Bar
by Qiwei Zhou, Chenbing Zhu, Xuelong Yang, Jianchong Chen and Jiegang Mou
Atmosphere 2024, 15(1), 58; https://doi.org/10.3390/atmos15010058 - 31 Dec 2023
Cited by 1 | Viewed by 1258
Abstract
Intelligent toilets can effectively remove odors and harmful substances from exhaust gases and wastewater, maintaining a fresh and clean indoor atmosphere, which is beneficial to the indoor environment and human health. Currently, research on intelligent toilets conducted by sanitary ware manufacturers is still [...] Read more.
Intelligent toilets can effectively remove odors and harmful substances from exhaust gases and wastewater, maintaining a fresh and clean indoor atmosphere, which is beneficial to the indoor environment and human health. Currently, research on intelligent toilets conducted by sanitary ware manufacturers is still in its early stages. Many of the intelligent toilets available on the market exhibit issues such as an excessive oscillation amplitude of the cleaning spray bar, premature breakdown of the water column, and inadequate air intake. The present study involves the analysis and redesign of a cleaning spray bar model for intelligent toilets. Additionally, several optimization schemes concerning the flow channel of the cleaning spray bar are proposed in order to enhance the performance of the liquid–air ejector. The computational fluid dynamics (CFD) technique is utilized to analyze the water flow characteristics within the cleaning spray bar of the intelligent toilet and to compare and evaluate the proposed schemes. The calculation results indicate that, for the same inlet flow rate, the optimal structure the block with a length of L = 1.5 mm and the block positioned (4). The swirl numbers of these two optimized models are 14.8% and 8.3% of the protype, respectively, while their air intake is 133% and 131% of the protype, respectively. The optimized solutions exhibited significant performance improvements when compared to the prototype. The computational results offer valuable insights for optimizing the flow characteristics of the enhanced product. Full article
(This article belongs to the Special Issue CFD Modeling in Multiphase Flow Transport/Separation Equipment)
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Review

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18 pages, 8857 KiB  
Review
Progress on Numerical Simulation of Gas-Liquid Two-Phase Flow in Self-Priming Pump
by Heng Qian, Hongbo Zhao, Chun Xiang, Zhenhua Duan, Sanxia Zhang and Peijian Zhou
Atmosphere 2024, 15(8), 953; https://doi.org/10.3390/atmos15080953 - 10 Aug 2024
Viewed by 999
Abstract
The fundamentals of the design and operation of self-priming pumps, as indispensable equipment in industry, have been the focus of research in the field of fluid mechanics. This paper begins with a comprehensive background on self-priming pumps and gas-liquid two-phase flow, and it [...] Read more.
The fundamentals of the design and operation of self-priming pumps, as indispensable equipment in industry, have been the focus of research in the field of fluid mechanics. This paper begins with a comprehensive background on self-priming pumps and gas-liquid two-phase flow, and it outlines recent advances in the field. Self-priming pumps within the gas-liquid two-phase flow state and the spatial and temporal evolution of the transient characteristics of self-priming pumps determine the self-priming pump self-absorption performance. Through mastery of the self-absorption mechanism, high-performance self-absorption pump products can be formed to provide theoretical support for the development of products. In current research, numerical simulation has become an important tool for analyzing and predicting the behavior of gas-liquid two-phase flow in self-priming pumps. This paper reviews existing numerical models of gas-liquid two-phase flow and categorizes them. Reviewing these models not only provides us with a comprehensive understanding of the existing research but also offers possible directions for future research. The complexity of gas–liquid interactions and their impact on pump performance is analyzed. Through these detailed discussions, we are able to identify the challenges in the simulation process and summarize what has been achieved. In order to further improve the accuracy and reliability of simulations, this paper introduces the latest simulation techniques and research methodologies, which provide new perspectives for a deeper understanding of gas-liquid two-phase flow. In addition, this paper investigates a variety of factors which affect the operating efficiency of self-priming pumps, including the design parameters, fluid properties, and operating conditions. Comprehensive consideration of these factors is crucial for optimizing pump performance. Finally, this paper summarizes the current research results and identifies the main findings and deficiencies. Based on this, the need to improve the accuracy of numerical simulations and to study the design parameters in depth to improve pump performance is emphasized. Full article
(This article belongs to the Special Issue CFD Modeling in Multiphase Flow Transport/Separation Equipment)
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