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Processes
Special Issues
CFD Simulation of Multiphase Flow
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CFD Simulation of Multiphase Flow

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Process Control and Monitoring".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 6108

Special Issue Editors

Dr. Xiaogang Shi

E-Mail Website
Guest Editor
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Interests: heavy oil processing; multiphase reaction engineering; numerical simulation
Special Issues, Collections and Topics in MDPI journals
Dr. Yupeng Xu

E-Mail Website
Guest Editor
National Energy Technology Laboratory, Morgantown, WV 26507, USA
Interests: multiscale modeling of multiphase flow; chemical reactors; coal, biomass, and plastic gasification; green energy
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Qingang Xiong

E-Mail Website
Guest Editor
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
Interests: computational fluid dynamics; multiphase flow and fluidization; biomass thermochemical conversion; high-performance computing; heat and mass transfer

Special Issue Information

Dear Colleagues,

Multiphase flow, such as gas-solid flow, systems are ubiquitous in the chemical, food, energy, and pharmaceutical industry. Experimental investigation of multiphase flows is vital but time-consuming and costly. With the development of advanced computer and numerical algorithms, multiscale computational fluid dynamics (CFD) of multiphase flows is becoming more and more popular and has seen noticeable progress in the modeling of various multiphase flows in recent years. Different numerical methods for micro, meso, and macro scales have been developed, such as particle-resolved direct numerical simulation, discrete element method/coarse grain discrete element method, two fluid model, and MPPIC. In addition, machine-learning-derived models and hybrid computing with CPU and GPU have recently been reported. These advancements have improved our understanding of various multiphase flow systems and helped toward the design and optimization of different reactors and operating conditions for industrial applications.

This Special Issue on ‘CFD simulation of Multiphase Flow’ seeks high-quality research and review papers focusing on multiscale CFD simulation of different multiphase flow systems. Topics include but are not limited to:

  • Development, verification, and validation of advanced CFD models such as particle-resolved direct numerical simulation, discrete element method/coarse grain discrete element method, two fluid model, MPPIC, etc.;
  • CFD modeling of various multiphase flow systems for physical understanding, design, and optimization of reactors and operating conditions;
  • High-performance computing using parallel computing, hybrid CPU–GPU computing, etc.

Dr. Xiaogang Shi
Dr. Yupeng Xu
Prof. Dr. Qingang Xiong
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

  • CFD
  • multiphase flow
  • fluidization
  • GPU
  • reactive
  • heat and mass transfer
  • open source

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Published Papers (2 papers)

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Research

13 pages, 3420 KiB  
Article
Evaluation of Hydrodynamic Performance of New Random Packing Structure Using CFD
by Jia-Lin Kang, Siao-Han Huang and Shi-Shang Jang
Processes 2022, 10(7), 1276; https://doi.org/10.3390/pr10071276 - 29 Jun 2022
Cited by 4 | Viewed by 2334
Abstract
This study demonstrates the use of computational fluid dynamics (CFD) to evaluate the hydraulic properties of a new/complicated random packing structure, including flooding point, interfacial area, and liquid holdup. A standard Raschig ring and an extremely complex helical ring were employed as representative [...] Read more.
This study demonstrates the use of computational fluid dynamics (CFD) to evaluate the hydraulic properties of a new/complicated random packing structure, including flooding point, interfacial area, and liquid holdup. A standard Raschig ring and an extremely complex helical ring were employed as representative traditional and new structures. The combination of Green-Gauss node-based method with polyhedral meshing was presented to improve the hydraulic predictions. The CFD models were adopted to extend the liquid-to-gas ratio, L/G to the flooding points for hydraulic evaluation. The combination to calculate the gradient is essential for correctly evaluating the hydrodynamics of the complex helical ring. The predicted hydrodynamics for the helical ring were in good agreement with the experimental data. The helical ring has a wider operating range of L/G than the Raschig ring. Furthermore, we observed that the gas-liquid interface changed during the flooding and found that the inverted interfacial area was caused due to the flooding affecting the generation of the gas-liquid interface. The hydrodynamics of the Raschig ring and helical ring were compared based on CFD simulations; notably, the helical ring exhibited a wider range of L/G ratios and a better hydraulic performance. Finally, the flooding behaviors of the Raschig ring and the helical ring were investigated through volume fraction contours in CFD. We found that a part of the liquid was blown away, leading to the gas-liquid mixing area increasing at the flooding point. A severe flooding state can be investigated due to a large volume of liquid leaving the upper outlet which could be found when over the flooding point. Full article
(This article belongs to the Special Issue CFD Simulation of Multiphase Flow)
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17 pages, 8920 KiB  
Article
Evaluation of Centrifugal Force, Erosion, Strain Rate, and Wall Shear in a Stairmand Cyclone
by Sajed Naiemi Dizajyekan, Gholamhossein Shahgholi, Adel Rezvanivand Fanaei, Vahid Rostampour, Vali Rasooli Sharabiani, Mariusz Szymanek and Ryszard Kulig
Processes 2022, 10(5), 994; https://doi.org/10.3390/pr10050994 - 17 May 2022
Cited by 5 | Viewed by 2329
Abstract
In the present study, imperative parameters including centrifugal force, erosion, streamline, strain rate, and wall shear are evaluated in a cyclone separator. The flaw of the cyclone surface due to erosion is an acute problem in the industry. According to the great importance [...] Read more.
In the present study, imperative parameters including centrifugal force, erosion, streamline, strain rate, and wall shear are evaluated in a cyclone separator. The flaw of the cyclone surface due to erosion is an acute problem in the industry. According to the great importance of the centrifugal force on the separation phenomenon, a comprehensive study is conducted. A computational fluid dynamics (CFD) simulation is realized by applying a Reynolds stress turbulence model (RSM), and particle–air interactions were modeled using a discrete phase model (DPM). The result shows a good agreement between the experimental data and CFD simulation on the tangential velocity and pressure drop. The maximum deviation of the validation process is 6.8%. It is found that the centrifugal force within the cyclone is increased with an enhancement in the inlet velocity. The separation efficiency indicates an increase–decrease treatment in various inlet velocities with inlet velocity up to 16 m⋅s−1 but decreases slightly at a velocity of 20 m⋅s−1. The pressure increases proportionally with inlet velocity. The best performance with the highest separation efficiency (99%) and pressure drop (416 Pa) obtains at the inlet velocity of 16 m⋅s−1 and mass flow rate of 0.01 kg⋅s−1. In addition, the maximum erosion rate was created in the entrance and conical part of the cyclone. Full article
(This article belongs to the Special Issue CFD Simulation of Multiphase Flow)
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