Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
2.8
1.9
Journals
Fluids
Special Issues
Multiphase Flow and Granular Mechanics
share announcement

Multiphase Flow and Granular Mechanics

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: 30 June 2024 | Viewed by 7664

Special Issue Editor

Dr. Hua Tan

E-Mail Website
Guest Editor
School of Engineering and Computer Science, Washington State University-Vancouver, Vancouver, WA 98686, USA
Interests: computational fluid dynamics (CFD); finite element analysis (FEA); multiphase flows; porous media flow; microfluidics; additive manufacturing; manufacturing process for fiber reinforced polymer (FRP) composites
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Multiphase flow and granular mechanics are two fascinating and interdisciplinary research areas with wide-ranging applications for engineering, physics, and environmental science. Multiphase flows occur when two or more phases, such as a gas–liquid, liquid–liquid, or solid–liquid, are present in a system. Granular mechanics, on the other hand, deal with the behavior of granular materials, such as sand, rocks, and powders. These two research areas share many well-known features and challenges, such as complex interfaces, phase transitions, and nonlinear behavior, making them crucial topics for interdisciplinary research.

This Special Issue aims to bring together original research articles, review papers, and perspectives focusing on recent advances and applications of multiphase flow and granular mechanics. This Special Issue also provides a platform for researchers to share their latest findings, exchange ideas, and identify future directions for research in these exciting and rapidly evolving fields.

Topics of interest include, but are not limited to:

  • The fundamentals of multiphase flow and granular mechanics;
  • Experimental and numerical methods to study multiphase flows and granular materials;
  • Modeling and the simulation of complex multiphase systems;
  • Transport phenomena in a multiphase flow and granular media;
  • Rheology and mechanical properties of granular materials;
  • Granular–fluid interactions in natural and engineered systems;
  • Applications in energy, environmental, and biomedical engineering.

Dr. Hua Tan
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

  • multiphase flow
  • granular mechanics
  • numerical methods
  • fluid–particle interactions
  • experimental techniques

Published Papers (6 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

18 pages, 4768 KiB  
Article
Characteristics of a Particle’s Incipient Motion from a Rough Wall in Shear Flow of Herschel–Bulkley Fluid
by Alexander Seryakov, Yaroslav Ignatenko and Oleg B. Bocharov
Fluids 2024, 9(3), 65; https://doi.org/10.3390/fluids9030065 - 05 Mar 2024
Viewed by 786
Abstract
A numerical simulation of the Herschel–Bulkley laminar steady state shear flow around a stationary particle located on a sedimentation layer was carried out. The surface of the sedimentation layer was formed by hemispheres of the same radius as the particle. The drag force, [...] Read more.
A numerical simulation of the Herschel–Bulkley laminar steady state shear flow around a stationary particle located on a sedimentation layer was carried out. The surface of the sedimentation layer was formed by hemispheres of the same radius as the particle. The drag force, lift force, and torque values were obtained in the following ranges: shear Reynolds numbers for a particle ReSH=2–200, corresponding to laminar flow; power law index n=0.6–1.0; and Bingham number Bn=0–10. A significant difference in the forces and torque acting on a particle in shear flow in comparison to the case of a smooth wall is shown. It is shown that the drag coefficient is on average 6% higher compared to a smooth wall for a Newtonian fluid but decreases with the increase in non-Newtonian properties. At the edge values of n=0.6 and Bn=10, the drag is on average 25% lower compared to the smooth wall. For a Newtonian fluid, the lift coefficient is on average 30% higher compared to a smooth wall. It also decreases with the increase in non-Newtonian properties of the fluid, but at the edge values of n=0.6 and Bn=10, it is on average only 3% lower compared to the smooth wall. Approximation functions for the drag, lift force, and torque coefficient are constructed. A reduction in the drag force and lifting force leads to an increase in critical stresses (Shields number) on the wall on average by 10% for incipient motion (rolling) and by 12% for particle detachment from the sedimentation bed. Full article
(This article belongs to the Special Issue Multiphase Flow and Granular Mechanics)
►▼ Show Figures

Figure 1

28 pages, 5176 KiB  
Article
A Computational Study of the Influence of Drag Models and Heat Transfer Correlations on the Simulations of Reactive Polydisperse Flows in Bubbling Fluidized Beds
by Manuel Ernani Cruz, Gabriel Lisbôa Verissimo, Filipe Leite Brandão and Albino José Kalab Leiroz
Fluids 2023, 8(11), 290; https://doi.org/10.3390/fluids8110290 - 28 Oct 2023
Viewed by 1325
Abstract
In this work, the influence of gas–solid drag and heat transfer coefficient models on the prediction capacity of the Euler–Euler approach to simulate reactive bubbling fluidized bed flows is studied. Three different cases are considered, a non-reactive bidisperse bubbling fluidized bed flow (Case [...] Read more.
In this work, the influence of gas–solid drag and heat transfer coefficient models on the prediction capacity of the Euler–Euler approach to simulate reactive bubbling fluidized bed flows is studied. Three different cases are considered, a non-reactive bidisperse bubbling fluidized bed flow (Case 1), and two reactive polydisperse flows in bubbling fluidized beds, one for biomass gasification (Case 2), and the other for biomass pyrolysis (Case 3). The Gidaspow, Syamlal–O’Brien, and BVK gas–solid drag models and the Gunn, Ranz–Marshall, and Li–Mason gas–solid heat transfer correlations are investigated. A Eulerian multiphase approach in a two-dimensional Cartesian domain is employed for the simulations. Computational results for the three cases are compared with experimental data from the literature. The results obtained here contribute to a better understanding of the impacts of such closure models on the prediction ability of the Euler–Euler approach to simulate reactive flows. The results indicate that, for the simulation of reactive flows in bubbling fluidized bed reactors, the kinetic modeling of the reactions has a global effect, which superposes with the influence of the drag and heat transfer coefficient models. Nevertheless, local parameters can be noticeably affected by the choice of the interface closure models. Finally, this work also identifies the models that lead to the best results for the cases analyzed here, and thus proposes the use of such selected models for gasification and pyrolysis processes occurring in bubbling fluidized bed reactors. Full article
(This article belongs to the Special Issue Multiphase Flow and Granular Mechanics)
►▼ Show Figures

Figure 1

14 pages, 4325 KiB  
Article
Settling Flow Details in the Flash Smelting Furnace—A CFD-DEM Simulation Study
by Jani-Petteri Jylhä and Ari Jokilaakso
Fluids 2023, 8(10), 283; https://doi.org/10.3390/fluids8100283 - 23 Oct 2023
Viewed by 1251
Abstract
The flash smelting furnace has previously been simulated using computational fluid dynamics (CFD). A new approach is to combine CFD and the discrete element method (DEM) for more detailed simulations of the different phenomena that occur as copper matte droplets settle through a [...] Read more.
The flash smelting furnace has previously been simulated using computational fluid dynamics (CFD). A new approach is to combine CFD and the discrete element method (DEM) for more detailed simulations of the different phenomena that occur as copper matte droplets settle through a slag layer. One of the most important phenomena found is the formation of a channeling flow which carries matte droplets faster through the slag. However, such phenomena cannot be directly observed in the flash smelting furnace settler due to the extreme temperatures of the opaque molten slag inside the furnace, therefore alternative methods are required for validating the phenomenon. In this work, the simulated channeling flow is validated with a sphere–oil model. The phenomenon was similar in all of the studied cases, although in the experimental setup the spheres settled faster in the oil model than in the simulations. The differences were most likely caused by the cohesion of the spheres and slight differences in the properties provided by the manufacturer and real properties for the oil and the spheres, and by the fact that simulation ignores surface tension and changing air–oil and water–oil interfaces. Full article
(This article belongs to the Special Issue Multiphase Flow and Granular Mechanics)
►▼ Show Figures

Figure 1

21 pages, 8974 KiB  
Article
Analysis of Core Annular Flow Behavior of Water-Lubricated Heavy Crude Oil Transport
by Salim Al Jadidi, Shivananda Moolya and Anbalagan Satheesh
Fluids 2023, 8(10), 267; https://doi.org/10.3390/fluids8100267 - 28 Sep 2023
Viewed by 1317
Abstract
A possible method for fluid transportation of heavy oil through horizontal pipes is core annular flow (CAF), which is water-lubricated. In this study, a large eddy simulation (LES) and a sub-grid-scale (SGS) model are used to examine CAF. The behavior of heavy oil [...] Read more.
A possible method for fluid transportation of heavy oil through horizontal pipes is core annular flow (CAF), which is water-lubricated. In this study, a large eddy simulation (LES) and a sub-grid-scale (SGS) model are used to examine CAF. The behavior of heavy oil flow through turbulent CAF in horizontal pipes is numerically investigated. The Smagorinsky model is utilized to capture small-scale unstable turbulent flows. The transient flow of oil and water is first separated under the behavior of the core fluid. Two different conditions of the horizontal pipes, one with sudden expansion and the other with sudden contraction, are considered in the geometry to investigate the effects of different velocities of oil and water on the velocity distribution, pressure drop, and volume fraction. The model was created to predict the losses that occur due to fouling and wall friction. According to the model, increasing water flow can reduce fouling. Additionally, the water phase had an impact on the CAF’s behavior and pressure drop. Also, the increased stability in the CAF reduces the pressure drop to a level that is comparable to water flow. This study demonstrated that a very viscous fluid may be conveyed efficiently utilizing the CAF method. Full article
(This article belongs to the Special Issue Multiphase Flow and Granular Mechanics)
►▼ Show Figures

Figure 1

21 pages, 5656 KiB  
Article
Rapid Hydrate Formation Conditions Prediction in Acid Gas Streams
by Anna Samnioti, Eirini Maria Kanakaki, Sofianos Panagiotis Fotias and Vassilis Gaganis
Fluids 2023, 8(8), 226; https://doi.org/10.3390/fluids8080226 - 05 Aug 2023
Cited by 2 | Viewed by 1429
Abstract
Sour gas in hydrocarbon reservoirs contains significant amounts of H2S and smaller amounts of CO2. To minimize operational costs, meet air emission standards and increase oil recovery, operators revert to acid gas (re-)injection into the reservoir rather than treating [...] Read more.
Sour gas in hydrocarbon reservoirs contains significant amounts of H2S and smaller amounts of CO2. To minimize operational costs, meet air emission standards and increase oil recovery, operators revert to acid gas (re-)injection into the reservoir rather than treating H2S in Claus units. This process requires the pressurization of the acid gas, which, when combined with low-temperature conditions prevailing in subsurface pipelines, often leads to the formation of hydrates that can potentially block the fluid flow. Therefore, hydrates formation must be checked at each pipeline segment and for each timestep during a flow simulation, for any varying composition, pressure and temperature, leading to millions of calculations that become more intense when transience is considered. Such calculations are time-consuming as they incorporate the van der Walls–Platteeuw and Langmuir adsorption theory, combined with complex EoS models to account for the polarity of the fluid phases (water, inhibitors). The formation pressure is obtained by solving an iterative multiphase equilibrium problem, which takes a considerable amount of CPU time only to provide a binary answer (hydrates/no hydrates). To accelerate such calculations, a set of classifiers is developed to answer whether the prevailing conditions lie to the left (hydrates) or the right-hand (no hydrates) side of the P-T phase envelope. Results are provided in a fast, direct, non-iterative way, for any possible conditions. A set of hydrate formation “yes/no” points, generated offline using conventional approaches, are utilized for the classifier’s training. The model is applicable to any acid gas flow problem and for any prevailing conditions to eliminate the CPU time of multiphase equilibrium calculations. Full article
(This article belongs to the Special Issue Multiphase Flow and Granular Mechanics)
►▼ Show Figures

Figure 1

14 pages, 4182 KiB  
Article
Supercritical Dynamics of an Oscillating Interface of Immiscible Liquids in Axisymmetric Hele-Shaw Cells
by Victor Kozlov, Stanislav Subbotin and Ivan Karpunin
Fluids 2023, 8(7), 204; https://doi.org/10.3390/fluids8070204 - 12 Jul 2023
Cited by 1 | Viewed by 768
Abstract
The oscillation of the liquid interface in axisymmetric Hele-Shaw cells (conical and flat) is experimentally studied. The cuvettes, which are thin conical layers of constant thickness and flat radial Hele-Shaw cells, are filled with two immiscible liquids of similar densities and a large [...] Read more.
The oscillation of the liquid interface in axisymmetric Hele-Shaw cells (conical and flat) is experimentally studied. The cuvettes, which are thin conical layers of constant thickness and flat radial Hele-Shaw cells, are filled with two immiscible liquids of similar densities and a large contrast in viscosity. The axis of symmetry of the cell is oriented vertically; the interface without oscillations is axially symmetric. An oscillating pressure drop is set at the cell boundaries, due to which the interface performs radial oscillations in the form of an oscillating “tongue” of a low-viscosity liquid, periodically penetrating into a more viscous liquid. An increase in the oscillation amplitude leads to the development of a system of azimuthally periodic structures (fingers) at the interface. The fingers grow when the viscous liquid is forced out of the layer and reach their maximum in the phase of maximum displacement of the interface. In the reverse course, the structures decrease in size and, at a certain phase of oscillations, take the form of small pits directed toward the low-viscosity fluid. In a conical cell, a bifurcation of period doubling with an increase in amplitude is found; in a flat cell, it is absent. A slow azimuthal drift of finger structures is found. It is shown that the drift is associated with the inhomogeneity of the amplitude of fluid oscillations in different radial directions. The fingers move from the region of a larger to the region of a lower amplitude of the interface oscillations. Full article
(This article belongs to the Special Issue Multiphase Flow and Granular Mechanics)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-6
Back to TopTop