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Fluids
Special Issues
Multiphase Flows in Engineering Applications
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Multiphase Flows in Engineering Applications

A special issue of Fluids (ISSN 2311-5521). This special issue belongs to the section "Flow of Multi-Phase Fluids and Granular Materials".

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 8297

Special Issue Editor

Dr. Fatemeh Salehi

E-Mail Website
Guest Editor
School of Engineering, Macquarie University, Macquarie Park, NSW 2109, Australia
Interests: computational fluid dynamics (CFD); multiphase flows; combustion modelling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Multiphase flows may comprise various states of matter, e.g., gas and solid in fluidisation; gas and liquid in bubble column; and gas, liquid, and solid in airlift slurry bed. They are present in nature and a wide range of engineering applications. Examples include biomass pyrolysis and gasification, liquid fuel injection systems, fire suppression systems, agricultural sprays, oil recovery, and spray drying of food products. Due to their importance in different applications, such flows have been topics of considerable interest in recent years. Various advanced numerical modelling and measurement techniques have been developed to enhance the understanding of such complex multiphysics and multiscale flows where interactions of turbulence, interface physics, phase change, and chemical reactions are important.

The purpose of this Special Issue is to collect state-of-the-art results related to the modelling and experimental studies of multiphase flows in different engineering applications in energy sector, biomedical and pharmaceutical industry, chemical process, nuclear industry, power plants, and nanofluid technologies.

Dr. Fatemeh Salehi
Guest Editor

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. Fluids 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 1800 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

  • Computational fluid dynamics (CFD) for multiphase flows
  • Theoretical/computational multiphase flows
  • Measurements and instruments for multiphase flows
  • Turbulence
  • Microfluid and nanofluid
  • Heat transfer in multiphase flows
  • Reacting and non-reacting multiphase flows
  • Sprays and particulate systems

Published Papers (3 papers)

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Research

14 pages, 7764 KiB  
Article
Improvement of Gas–Liquid Separation Performance of Engine Oil Using Swirling
by Shinji Kajiwara
Fluids 2022, 7(9), 304; https://doi.org/10.3390/fluids7090304 - 15 Sep 2022
Cited by 1 | Viewed by 1427
Abstract
The purpose of this study is to improve the gas–liquid separation performance of an oil tank and to establish a design method to enable gas–liquid separation only in an oil tank. Since it is difficult for conventional oil tanks to completely remove bubbles [...] Read more.
The purpose of this study is to improve the gas–liquid separation performance of an oil tank and to establish a design method to enable gas–liquid separation only in an oil tank. Since it is difficult for conventional oil tanks to completely remove bubbles remaining in the hydraulic oil, it is essential to introduce a technology to actively separate and remove bubbles from the oil. Therefore, the bubble removal performance was improved even under the condition of added lateral acceleration by appropriately generating a swirl flow. First, an acrylic model of an oil tank was used to verify the accuracy by performing numerical analysis using various turbulence models. Then, the parameters of the bubble remover, such as the size of the oil tank, were studied. In addition, the bubble removal performance under the condition of added lateral acceleration was examined. Full article
(This article belongs to the Special Issue Multiphase Flows in Engineering Applications)
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13 pages, 1684 KiB  
Article
Particle Transport Velocity in Vertical Transmission with an Airlift Pump
by Parviz Enany, Oleksandr Shevchenko and Carsten Drebenstedt
Fluids 2022, 7(3), 95; https://doi.org/10.3390/fluids7030095 - 05 Mar 2022
Cited by 8 | Viewed by 3362
Abstract
This paper presents the optimal conditions for fast transfer of solid particle with an airlift pump. The experimental examinations were carried out in an airlift pump with a length of 5.64 m and an inner diameter of 0.102 m in order to determine [...] Read more.
This paper presents the optimal conditions for fast transfer of solid particle with an airlift pump. The experimental examinations were carried out in an airlift pump with a length of 5.64 m and an inner diameter of 0.102 m in order to determine the impact of submergence ratio, air flow, and physical particle properties, such as shape, size, and density, on the vertical velocity of the particle in detail. The results showed that with the same air flow, the maximum particle velocity was achieved when the churn flow regime is established with a submergence ratio close to 0.89. However, in bubble and slug flow, it is not possible to carry a large particle in the dimensions of centimeters. Furthermore, in a churn flow, the velocity of the particle exceeds the velocity of pumped water; hence, water is not the only particle carrier in a vertical three-phase flow. Full article
(This article belongs to the Special Issue Multiphase Flows in Engineering Applications)
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21 pages, 6295 KiB  
Article
Large-Eddy Simulation of a Hydrocyclone with an Air Core Using Two-Fluid and Volume-of-Fluid Models
by Hassan Fayed, Mustafa Bukhari and Saad Ragab
Fluids 2021, 6(10), 364; https://doi.org/10.3390/fluids6100364 - 14 Oct 2021
Cited by 2 | Viewed by 2089
Abstract
Large-eddy simulations have been conducted for two-phase flow (water and air) in a hydrocyclone using Two-Fluid (Euler–Euler) and Volume-of-Fluid (VOF) models. Subgrid stresses are modeled using a dynamic eddy–viscosity model, and results are compared to those using the Smagorinsky model. The effects of [...] Read more.
Large-eddy simulations have been conducted for two-phase flow (water and air) in a hydrocyclone using Two-Fluid (Euler–Euler) and Volume-of-Fluid (VOF) models. Subgrid stresses are modeled using a dynamic eddy–viscosity model, and results are compared to those using the Smagorinsky model. The effects of grid resolutions on the mean flow and turbulence statistics have been thoroughly investigated. Five block-structured grids of 0.72, 1.47, 2.4, 3.81, and 7.38 million elements have been used for the simulations of Hsieh’s 75 mm hydrocyclone Mean velocity profiles and normal Reynolds stresses have been compared with experimental data. Results of the two-fluid model are in good agreement with those of the VOF model. A fine mesh in the axial and radial directions is necessary for capturing the turbulent vortical structure. Turbulence structures in the hydrocyclone are dominated by helical vortices around the air core. Energy spectra are analyzed at different points in the hydrocyclone, and regions of low turbulent kinetic energy are identified and attributed to stabilizing effects of the swirling velocity component. Full article
(This article belongs to the Special Issue Multiphase Flows in Engineering Applications)
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