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Processes
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Multiphase Flow Process and Separation Technology
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Multiphase Flow Process and Separation Technology

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Separation Processes".

Deadline for manuscript submissions: 25 July 2025 | Viewed by 2322

Special Issue Editors

Dr. Zhiyi Xiong

E-Mail Website
Guest Editor
College of Mechanical and Transportation Engineering, China University of Petroleum Beijing, No.18, Fuxue Road, Changping District, Beijing 102249, China
Interests: multiphase flow process; separation equipment; modeling and simulation; centrifugal compressor performance and reliability
Dr. Xinwei Wang

E-Mail Website
Guest Editor
College of New Energy, China University of Petroleum (East China), No. 66, West Changjiang Road, Qingdao 266580, China
Interests: characterization of thermal properties under extreme conditions; theory and technology of heavy oil thermal recovery; comprehensive energy utilization technology for oil fields

Special Issue Information

Dear Colleagues,

This Special Issue on “Multiphase Flow Process and Separation Technology” mainly concerns research papers on new technologies of multiphase flow and separation equipment, new methods of research, theories of design, etc. Researchers are welcome to submit their papers. It is expected that the research methodology, including the research design, experimental methods, sample selection, and data analysis techniques, should be detailed; the main results should highlight the significance and novelty of the submissions.

Topic include, but are not limited to, the following:

  • The development of models or simulations or experiments of multiphase processes.
  • The development of models or simulations or experiments of separation equipment.
  • Design, analysis, optimization, and performance of novel separation technologies.
  • Simulation techniques, algorithms, or other tools for modeling and simulation.

Thank you, and I hope you consider participating in this Special Issue.

Dr. Zhiyi Xiong
Dr. Xinwei Wang
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. Processes 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 process
  • separation equipment strengthening
  • new design
  • research method
  • gas–liquid–solid separation

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

23 pages, 17410 KiB  
Article
Analysis and Optimization of Thermal Storage Performance of Thermocline Storage Tank with Different Water Distribution Structures
by Xinwei Wang, Longbin Duan, Genying Gao, Weibo Zheng, Dong Sun, Jinyu Li, Jing Fu and Riyi Lin
Processes 2025, 13(3), 629; https://doi.org/10.3390/pr13030629 - 22 Feb 2025
Viewed by 626
Abstract
Energy storage is essential for solar energy utilization, and thermocline storage tanks are commonly used. To improve temperature stratification and storage efficiency, we investigated the effect of different water distributor configurations on tank stratification. We numerically analyzed the heat storage processes in hot [...] Read more.
Energy storage is essential for solar energy utilization, and thermocline storage tanks are commonly used. To improve temperature stratification and storage efficiency, we investigated the effect of different water distributor configurations on tank stratification. We numerically analyzed the heat storage processes in hot water tanks with three water distribution configurations: star, antenna, and octagonal. Temperature stratification was evaluated based on thermocline thickness and storage efficiency. Thermal storage efficiency improves by 0.45% when the outlet direction of the water distributor matches the fluid’s motion direction during natural stratification. The energy storage process is categorized into three stages based on efficiency changes, with different factors affecting efficiency at each stage. In the initial stage, antenna-type and octagonal water distribution improve temperature uniformity along the axial section, reduce thermocline thickness, and enhance stratification. Final efficiency during this stage is primarily influenced by energy loss resulting from the mixing of hot and cold water. In the development stage, energy storage efficiency decreases mainly because the lower boundary of the thermocline reaches the exit, causing partial discharge of hot water. Among the three configurations, the octagonal water distribution exhibits the lowest energy loss, 6.4% lower than that of the star-type distribution. Full article
(This article belongs to the Special Issue Multiphase Flow Process and Separation Technology)
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21 pages, 9485 KiB  
Article
Numerical Study of the Soil Temperature Field Affected by Natural Gas Pipeline Leakage
by Weichun Chang, Xiaolong Gu, Xiahua Zhang, Zenian Gou, Xin Zhang and Zhiyi Xiong
Processes 2025, 13(1), 36; https://doi.org/10.3390/pr13010036 - 27 Dec 2024
Viewed by 630
Abstract
This study investigates the impact of natural gas pipeline leakage on the soil temperature field through numerical simulations. Physical and mathematical models were developed to analyze the temperature and flow field changes resulting from pipeline leaks. The study explores the influence of various [...] Read more.
This study investigates the impact of natural gas pipeline leakage on the soil temperature field through numerical simulations. Physical and mathematical models were developed to analyze the temperature and flow field changes resulting from pipeline leaks. The study explores the influence of various leakage factors on the temperature distribution in the surrounding soil. Key findings include the identification of the buried pipeline temperature as a critical factor influencing the soil temperature gradient when surface temperatures are similar to the subsurface constant temperature. Upon leakage, the pressure distribution around the leak is symmetrical, with a higher pressure at the leak point, and the Joule–Thomson effect causes a rapid decrease in gas temperature, forming a permafrost zone. The study also reveals that increased transport pressure expands the permafrost area, with pressure playing a significant role in the temperature field distribution. Additionally, an increase in the leak orifice diameter accelerates the expansion of the permafrost area and reduces the time for temperature stabilization at monitoring points. Conversely, changes in the leak direction mainly affect the spatial distribution of the permafrost zone without significantly altering its size. The findings provide valuable insights for monitoring natural gas pipeline leaks through temperature field variations. Full article
(This article belongs to the Special Issue Multiphase Flow Process and Separation Technology)
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21 pages, 10529 KiB  
Article
A Study on the Influence of Core Stability on the Coring Process of Long-Barrel Coring Tools
by Jiliang Liu, Jinsheng Sun, Guancheng Jiang and Yongjin Yu
Processes 2024, 12(12), 2847; https://doi.org/10.3390/pr12122847 - 12 Dec 2024
Viewed by 730
Abstract
In the process of long-barrel coring, the improper selection of operating parameters can easily cause blocked deformation, violent vibration of the core, core fracture, and impact crushing, which lead to a reduction in the stability of the core and core harvesting rates. Accurate [...] Read more.
In the process of long-barrel coring, the improper selection of operating parameters can easily cause blocked deformation, violent vibration of the core, core fracture, and impact crushing, which lead to a reduction in the stability of the core and core harvesting rates. Accurate knowledge of the influence of relevant factors on core stability is the key to improving core harvesting rates. Therefore, in this study, a numerical calculation model for tight and fractured cores in a barrel was constructed based on the Drucker–Prager criterion, using the finite element method. A numerical calculation model of a core broken into a barrel was constructed using the discrete element method. A study was conducted on the influence law of core stability under different core lengths, rotational speeds, weights on bit, and well inclination angles. The influence of each factor on core stability was analysed based on the vibration displacement and stress distribution characteristics of the core. The calculations show that increasing the weight on bit and reducing the rotation speed can effectively reduce the radial vibration displacement and local stress in tight and fractured cores, reduce the possibility of core fracture or breakage, and improve core stability. When the well inclination angle is large, it can easily cause core deformation and wall sliding, generating large contact stress and radial vibration displacement, significantly reducing the core stability. A broken core has the worst stability and is easily compacted in the core barrel, producing secondary crushing and plugging effects. Increasing the core barrel length resulted in a more unstable core. Compared with single-barrel coring, the distortion of the core column under double-barrel coring was more evident. In addition, the coring process, cuttings distribution, and drill bit hydraulic characteristics were studied based on the CFD-DPM method. The conclusions of this study are of great significance for optimising coring operation parameters to further improve core stability and coring harvest rate. Full article
(This article belongs to the Special Issue Multiphase Flow Process and Separation Technology)
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